US 8,327,104 B2Grant
Adjusting the timing of signals associated with a memory system
Issue Date:2012-12-04
•30 Claims
•6 Drawing Sheets
Abstract
A system and method are provided for adjusting the timing of signals associated with a memory system. A memory controller is provided. Additionally, at least one memory module is provided. Further, at least one interface circuit is provided, the interface circuit capable of adjusting timing of signals associated with one or more of the memory controller and the at least one memory module.
Metadata
Assignee
- Google Inc.
Inventors
- Michael John Sebastian Smith
- Daniel L. Rosenband
- David T. Wang
- Suresh Natarajan Rajan
Application Information
Application Number:US 11/939,440
Filing Date:2007-11-13
Priority Date:2006-07-31
Art Unit:2189
Classifications
IPC:
G06F13/00
Patent Drawings (6 sheets)
Description
Related Application(s)
[0001] The present application is a continuation-in-part of an application Ser. No. 11/524,811 filed Sep. 20, 2006 now U.S. Pat. No. 7,590,796, which is a continuation-in-part of an application filed Jul. 31, 2006 under application Ser. No. 11/461,439 now U.S. Pat. No. 7,580,312, which are incorporated herein by reference for all purposes. The present application claims the benefit of priority to the provisional application 60/865,627 filed Nov. 13, 2006, which is incorporated herein by reference for all purposes. Insofar as any definitions, information used for claim interpretation, etc. from the above parent/provisional application conflict with that set forth herein, such definitions, information, etc. in the present application should apply.
Field of the Invention
[0002] The present invention relates to memory systems and more particularly to improving memory systems.
Background
[0003] There is a need for larger, faster, higher performance memory systems with increased and improved user features while still maintaining low power, form factor, and backward compatibility
Summary
[0004] A system and method are provided for adjusting the timing of signals associated with a memory system. A memory controller is provided. Additionally, at least one memory module is provided. Further, at least one interface circuit is provided, the interface circuit capable of adjusting timing of signals associated with one or more of the memory controller and the at least one memory module.
Brief Description of the Drawings
[0005] FIG. 1A depicts a memory system for adjusting the timing of signals associated with the memory system, in accordance with one embodiment.
[0006] FIG. 1B depicts a memory system for adjusting the timing of signals associated with the memory system, in accordance with another embodiment.
[0007] FIG. 1C depicts a memory system for adjusting the timing of signals associated with the memory system, in accordance with another embodiment.
[0008] FIG. 2 depicts a system platform, in accordance with one embodiment.
[0009] FIG. 3 shows the system platform of FIG. 2 including signals and delays, in accordance with one embodiment.
Detailed Description
[0010] FIG. 1A depicts a memory system 150 for adjusting the timing of signals associated with the memory system 150, in accordance with one embodiment. As shown, a memory controller 152 is provided. In the context of the present description, a memory controller refers to any device capable of sending instructions or commands, or otherwise controlling memory circuits. Additionally, at least one memory module 154 is provided. Further, at least one interface circuit 156 is provided, the interface circuit capable of adjusting timing of signals associated with one or more of the memory controller 152 and the at least one memory module 154.
[0011] The signals may be any signals associated with the memory system 150. For example, in various embodiments, the signals may include address signals, control signals, data signals, commands, etc. As an option, the timing may be adjusted based on a type of the signal (e.g. a command, etc.). As another option, the timing may be adjusted based on a sequence of commands.
[0012] In one embodiment, the adjustment of the timing of the signals may allow for the insertion of additional logic for use in the memory system 150. In this case, the additional logic may be utilized to improve performance of one or more aspects of the memory system 150. For example, in various embodiments the additional logic may be utilized to improve and/or implement reliability, accessibility and serviceability (RAS) functions, power management functions, mirroring of memory, and other various functions. As an option, the performance of the one or more aspects of the memory system may be improved without physical changes to the memory system 150.
[0013] Additionally, in one embodiment, the timing may be adjusted based on at least one timing requirement. In this case, the at least one timing requirement may be specified by at least one timing parameter at one or more interfaces included in the memory system 150. For example, in one case, the adjustment may include modifying one or more delays. Strictly as an option, the timing parameters may be modified to allow the adjusting of the timing.
[0014] More illustrative information will now be set forth regarding various optional architectures and features of different embodiments with which the foregoing framework may or may not be implemented, per the specification of a user. It should be strongly noted that the following information is set forth for illustrative purposes and should not be construed as limiting in any manner. Any of the following features may be optionally incorporated with or without the other features described.
[0015] FIG. 1B depicts a memory system 100 for adjusting the timing of signals associated with the memory system 100, in accordance with another embodiment. As an option, the present system 100 may be implemented in the context of the functionality and architecture of FIG. 1A . Of course, however, the system 100 may be implemented in any desired environment. It should also be noted that the aforementioned definitions may apply during the present description.
[0016] As shown, the memory system 100 includes an interface circuit 102 disposed electrically between a system 106 and one or more memory modules 104A-104N. Processed signals 108 between the system 106 and the memory modules 104A-104N pass through an interface circuit 102. Passed signals 110 may be routed directly between the system 106 and the memory modules 104A-104N without being routed through the interface circuit 102. The processed signals 108 are inputs or outputs to the interface circuit 102, and may be processed by the interface circuit logic to adjust the timing of address, control and/or data signals in order to that improve performance of a memory system. In one embodiment, the interface circuit 102 may adjust timing of address, control and/or data signals in order to allow insertion of additional logic that improves performance of a memory system.
[0017] FIG. 1C depicts a memory system 120 for adjusting the timing of signals associated with the memory system 120, in accordance with another embodiment. As an option, the present system 120 may be implemented in the context of the functionality and architecture of FIGS. 1A-1B . Of course, however, the system 100 may be implemented in any desired environment. Again, the aforementioned definitions may apply during the present description.
[0018] In operation, processed signals 122 and 124 may be processed by an intelligent register circuit 126, or by intelligent buffer circuits 128A-128D, or in some combination thereof. FIG. 1C also shows an interconnect scheme wherein signals passing between the intelligent register 126 and memory 130A-130D, whether directly or indirectly, may be routed as independent groups of signals 131-134 or a shared signal (e.g. the processed signals 122 and 124).
[0019] FIG. 2 depicts a system platform 200, in accordance with one embodiment. As an option, the system platform 200 may be implemented in the context of the details of FIGS. 1A-1C . Of course, however, the system platform 200 may be implemented in any desired environment. Additionally, the aforementioned definitions may apply during the present description.
[0020] As shown, the system platform 200 is provided including separate components such as a system 220 (e.g. a motherboard), and memory module(s) 280 which contain memory circuits 281 [e.g. physical memory circuits, dynamic random access memory (DRAM), synchronous DRAM (SDRAM), double-data-rate (DDR) memory, DDR2, DDR3, graphics DDR (GDDR), etc.]. In one embodiment, the memory modules 280 may include dual-in-line memory modules (DIMMs). As an option, the computer platform 200 may be configured to include the physical memory circuits 281 connected to the system 220 by way of one or more sockets.
[0021] In one embodiment, a memory controller 221 may be designed to the specifics of various standards. For example, the standard defining the interfaces may be based on Joint Electron Device Engineering Council (JEDEC) specifications compliant to semiconductor memory (e.g. DRAM, SDRAM, DDR2, DDR3, GDDR etc.). The specifics of these standards address physical interconnection and logical capabilities.
[0022] As shown further, the system 220 may include logic for retrieval and storage of external memory attribute expectations 222, memory interaction attributes 223, a data processing unit 224, various mechanisms to facilitate a user interface 225, and a system basic Input/Output System (BIOS) 226.
[0023] In various embodiments, the system 220 may include a system BIOS program capable of interrogating the physical memory circuits 281 to retrieve and store memory attributes. Further, in external memory embodiments, JEDEC-compliant DIMMs may include an electrically erasable programmable read-only memory (EEPROM) device known as a Serial Presence Detect (SPD) 282 where the DIMM memory attributes are stored. It is through the interaction of the system BIOS 226 with the SPD 282 and the interaction of the system BIOS 226 with physical attributes of the physical memory circuits 281 that memory attribute expectations of the system 220 and memory interaction attributes become known to the system 220. Also optionally included on the memory module 280 are address register logic 283 (i.e. JEDEC standard register, register, etc.) and data buffer(s) and logic 284. The functions of the registers 283 and the data buffers 284 may be utilized to isolate and buffer the physical memory circuits 281, reducing the electrical load that must be driven.
[0024] In various embodiments, the computer platform 200 may include one or more interface circuits 270 electrically disposed between the system 220 and the physical memory circuits 281. The interface circuits 270 may be physically separate from the memory module 280 (e.g. as discrete components placed on a motherboard, etc.), may be placed on the memory module 280 (e.g. integrated into the address register logic 283, or data buffer logic 284, etc.), or may be part of the system 220 (e.g. integrated into the memory controller 221, etc.).
[0025] In various embodiments, some characteristics of the interface circuit 270 may include several system-facing interfaces. For example, a system address signal interface 271, a system control signal interface 272, a system clock signal interface 273, and a system data signal interface 274 may be included. The system-facing interfaces 271-274 may be capable of interrogating the system 220 and receiving information from the system 220. In various embodiments, such information may include information available from the memory controller 221, the memory attribute expectations 222, the memory interaction attributes 223, the data processing engine 224, the user interface 225 or the system BIOS 226.
[0026] Similarly, the interface circuit 270 may include several memory-facing interfaces. For example a memory address signal interface 275, a memory control signal interface 276, a memory clock signal interface 277, and a memory data signal interface 278 may be included. In another embodiment, an additional characteristic of the interface circuit 270 may be the optional presence of emulation logic 230. The emulation logic 230 may be operable to receive and optionally store electrical signals (e.g. logic levels, commands, signals, protocol sequences, communications, etc.) from or through the system-facing interfaces 271-274, and process those signals.
[0027] The emulation logic 230 may respond to signals from the system-facing interfaces 271-274 by responding back to the system 220 by presenting signals to the system 220, processing those signals with other information previously stored, or may present signals to the physical memory circuits 281. Further, the emulation logic 230 may perform any of the aforementioned operations in any order.
[0028] In one embodiment, the emulation logic 230 may be capable of adopting a personality, wherein such personality defines the attributes of the physical memory circuit 281. In various embodiments, the personality may be effected via any combination of bonding options, strapping, programmable strapping, the wiring between the interface circuit 270 and the physical memory circuits 281, and actual physical attributes (e.g. value of a mode register, value of an extended mode register, etc.) of the physical memory circuits 281 connected to the interface circuit 270 as determined at some moment when the interface circuit 270 and physical memory circuits 281 are powered up.
[0029] Physical attributes of the memory circuits 281 or of the system 220 may be determined by the emulation logic 230 through emulation logic interrogation of the system 220, the memory modules 280, or both. In some embodiments, the emulation logic 230 may interrogate the memory controller 221, the memory attribute expectations 222, the memory interaction attributes 223, the data processing engine 224, the user interface 225, or the system BIOS 226, and thereby adopt a personality. Additionally, in various embodiments, the functions of the emulation logic 230 may include refresh management logic 231, power management logic 232, delay management logic 233, one or more look-aside buffers 234, SPD logic 235, memory mode register logic 236, as well as RAS logic 237, and clock management logic 238.
[0030] The optional delay management logic 233 may operate to emulate a delay or delay sequence different from the delay or delay sequence presented to the emulation logic 230 from either the system 220 or from the physical memory circuits 281. For example, the delay management logic 233 may present staggered refresh signals to a series of memory circuits, thus permitting stacks of physical memory circuits to be used instead of discrete devices. In another case, the delay management logic 233 may introduce delays to integrate well-known memory system RAS functions such a hot-swap, sparing, and mirroring.
[0031] FIG. 3 shows the system platform 200 of FIG. 2 including signals and delays, in accordance with one embodiment. As an option, the signals and delays of FIG. 3 may be implemented in the context of the details of FIGS. 1-2 . Of course, however, the signals and delays of FIG. 3 may be implemented in any desired environment. Further, the aforementioned definitions may apply during the present description.
[0032] It should be noted that the signals and other names in FIG. 3 use the abbreviation “Dr” for DRAM and “Mc” for memory controller. For example, “DrAddress” are the address signals at the DRAM, “DrControl” are the control signals defined by JEDEC standards (e.g. ODT, CK, CK#, CKE, CS#, RAS#, CAS#, WE#, DQS, DQS#, etc.) at the DRAM, and “DrReadData” and “DrWriteData” are the bidirectional data signals at the DRAM. Similarly, “McAddress,” “McCmd,” “McReadData,” and “McWriteData” are the corresponding signals at the memory controller interface.
[0033] Each of the memory module(s), interface circuits(s) and system may add delay to signals in a memory system. In the case of memory modules, the delays may be due to the physical memory circuits (e.g. DRAM, etc.), and/or the address register logic, and/or data buffers and logic. In the case of the interface circuits, the delays may be due to the emulation logic under control of the delay management logic. In the case of the system, the delays may be due to the memory controller.
[0034] All of these delays may be modified to allow improvements in one or more aspects of system performance. For example, adding delays in the emulation logic allows the interface circuit(s) to perform power management by manipulating the CKE (i.e. a clock enable) control signals to the DRAM in order to place the DRAM in low-power states. As another example, adding delays in the emulation logic allows the interface circuit(s) to perform staggered refresh operations on the DRAM to reduce instantaneous power and allow other operations, such as I/O calibration, to be performed.
[0035] Adding delays to the emulation logic may also allow control and manipulation of the address, data, and control signals connected to the DRAM to permit stacks of physical memory circuits to be used instead of discrete DRAM devices. Additionally, adding delays to the emulation logic may allow the interface circuit(s) to perform RAS functions such as hot-swap, sparing and mirroring of memory. Still yet, adding delays to the emulation logic may allow logic to be added that performs translation between different protocols (e.g. translation between DDR and GDDR protocols, etc.). In summary, the controlled addition and manipulation of delays in the path between memory controller and physical memory circuits allows logic operations to be performed that may potentially enhance the features and performance of a memory system.
[0036] Two examples of adjusting timing of a memory system are set forth below. It should be noted that such examples are illustrative and should not be construed as limiting in any manner. Table 1 sets forth definitions of timing parameters and symbols used in the examples, where time and delay are measured in units of clock cycles.
[0037] In the context of the two examples, the first example illustrates the normal mode of operation of a DDR2 Registered DIMM (RDIMM). The second example illustrates the use of the interface circuit(s) to adjust timing in a memory system in order to add or implement improvements to the memory system.
[0038]
| TABLE 1 | |
|---|---|
| CAS (column address strobe) Latency (CL) is the time between | |
| READ command (DrReadCmd) and READ data (DrReadData). | |
| Posted CAS Additive Latency (AL) delays the READ/WRITE | |
| command to the internal device (the DRAM array) by AL | |
| clock cycles. | |
| READ Latency (RL) = AL + CL. | |
| WRITE Latency (WL) = AL + CL − 1 (where 1 represents | |
| one clock cycle). | |
[0039] The above latency values and parameters are all defined by JEDEC standards. The timing examples used here will use the DDR2 JEDEC standard. Timing parameters for the DRAM devices are also defined in manufacturer datasheets (e.g. see Micron datasheet for 1 Gbit DDR2 SDRAM part MT47H256M4). The configuration and timing parameters for DIMMs may also be obtained from manufacturer datasheets [e.g. see Micron datasheet for 2 Gbyte DDR2 SDRAM Registered DIMM part MT36H2TF25672 (P)].
[0040] Additionally, the above latency values and parameters are as seen and measured at the DRAM and not necessarily equal to the values seen by the memory controller. The parameters illustrated in Table 2 will be used to describe the latency values and parameters seen at the DRAM.
[0041]
| TABLE 2 | |
|---|---|
| DrCL is the CL of the DRAM. | |
| DrWL is the WL of the DRAM. | |
| DrRL is the RL of the DRAM. | |
[0042] It should be noted that the latency values and parameters programmed into the memory controller are not necessarily the same as the latency of the signals seen at the memory controller. The parameters shown in Table 3 may be used to make the distinction between DRAM and memory controller timing and the programmed parameter values clear.
[0043]
| TABLE 3 | |
|---|---|
| McCL is the CL as seen at the memory controller interface. | |
| McWL is the WL as seen at the memory controller interface. | |
| McRL is the RL as seen at the memory controller interface. | |
[0044] In this case, when the memory controller is set to operate with DRAM devices that have CL =4 on an R-DIMM, the extra clock cycle delay due to the register on the R-DIMM may be hidden to a user. For an R-DIMM using CL =4 DRAM, the memory controller McCL =5. It is still common to refer to the memory controller latency as being set for CL =4 in this situation. In this situation, the first and second examples will refer to McCL =5, however, noting that the register is present and adding delay in an R-DIMM. The symbols in Table 4 are used to represent the delays in various parts of the memory system (again in clock cycles).
[0045]
| TABLE 4 |
|---|
| IfAddressDelay 301 is additional delay of Address |
| signals by the interface circuit(s). |
| IfReadCmdDelay and IfWriteCmdDelay 302 is additional |
| delay of READ and WRITE commands by the interface circuit(s). |
| IfReadDataDelay and IfWriteDataDelay 303 is additional |
| delay of READ and WRITE Data signals by the interface circuit(s). |
| DrAddressDelay 304, DrReadCmdDelay and DrWriteCmdDelay 305, |
| DrReadDataDelay and DrWriteDataDelay 306 is delay for the DRAM. |
| McAddressDelay 307, McReadCmdDelay 308, McWriteCmdDelay 308, |
| McReadDataDelay and McWriteDataDelay 309 is delay for the |
| memory controller. |
[0046] In the first example, it is assumed that DRAM parameters DrCL=4, DrAL=0, all memory controller delays are 0 (McAddressDelay, McReadDelay, McWriteDelay, and McDataDelay), and that all DRAM delays are 0 (DrAddressDelay, DrReadDelay, DrWriteDelay, and DrDataDelay). Furthermore, assumptions for the emulation logic delays are shown in Table 5.
[0047]
| TABLE 5 | |
|---|---|
| IfAddressDelay = 1 | |
| IfReadCmdDelay = 1 | |
| IfWriteCmdDelay = 1 | |
| IfReadDataDelay = 0 | |
| IfWriteDataDelay = 0 | |
[0048] In the first example, the emulation logic is acting as a normal JEDEC register and delaying the Address and Command signals by one clock cycle (corresponding to IfAddressDelay=1, if WriteCmdDely=1, IfReadCmdDelay=1). In this case, the equations shown in Table 6 describe the timing of the signals at the DRAM. Table 7 shows the timing of the signals at the memory controller.
[0049]
| TABLE 6 | |
|---|---|
| READ: DrReadData − DrReadCmd = DrCL = 4 | |
| WRITE: DrWriteData − DrWriteCmd = DrWL = DrCL − 1 = 3 | |
[0050]
| TABLE 7 | |
|---|---|
| Since IfReadCmdDelay = 1, DrReadCmd = McReadCmd + 1 | |
| (commands are delayed by one cycle), and DrReadData = | |
| MCReadData (no delay), READ is McReadData − McReadCmd = | |
| McCL = 4 + 1 = 5. | |
| Since IfWriteCmdDelay = 1, DrWriteCmd = McWriteCmd + | |
| 1 (delayed by one cycle), and DrWriteData = McWriteData | |
| (no delay), WRITE is McWriteData − McWriteCmd = McWL = | |
| 3 + 1 = 4 = McCL − 1. | |
[0051] This example with McCL=5 corresponds to the normal mode of operation for a DDR2 RDIMM using CL=4 DRAM.
[0052] In one case, it may be desirable for the emulation logic to perform logic functions that will improve one or more aspects of the performance of a memory system as described above. To do this, extra logic may be inserted in the emulation logic data paths. In this case, the addition of the emulation logic may add some delay. In one embodiment, a technique may be utilized to account for the delay and allow the memory controller and DRAM to continue to work together in a memory system in the presence of the added delay. In the second example, it is assumed that the DRAM timing parameters are the same as noted above in the first example, however the emulation logic delays are as shown in Table 8 below.
[0053]
| TABLE 8 |
|---|
| IfAddressDelay = 2 |
| IfReadCmdDelay = 2 |
| IfReadDataDelay = 1 |
| IfWriteDataDelay = 1 |
| The CAS latency requirement must be met at the DRAM for READs, thus |
| READ is DrReadData − DrReadCmd = DrCL = 4. |
[0054] In order to meet this DRAM requirement, McCL, the CAS Latency as seen at the memory controller, may be set higher than in the first example to allow for the interface circuit READ data delay (IfDataDelay=1), since now McReadData=DrReadData+1, and to allow for the increased interface READ command delay, since now DrReadCmd=McReadCmd+2. Thus, in this case, the READ timing is as illustrated in Table 9.
[0055]
| TABLE 9 | |
|---|---|
| READ: McCL = McReadData − McReadCmd = 7 | |
[0056] By setting the CAS latency, as viewed and interpreted by the memory controller, to a higher value than required by the DRAM CAS latency, the memory controller may be tricked into believing that the additional delays of the interface circuit(s) are due to a lower speed (i.e. higher CAS latency) DRAM. In this case, the memory controller may be set to McCL=7 and may view the DRAM on the RDIMM as having a CAS latency of CL=6 (whereas the real DRAM CAS latency is CL=4).
[0057] In certain embodiments, however, introducing the emulation logic delay may create a problem for the WRITE commands in this example. For instance, the memory system should meet the WRITE latency requirement at the DRAM, which is the same as the first example, and is shown in Table 10.
[0058]
| TABLE 10 | |
|---|---|
| WRITE: DrWriteData − DrWriteCmd = DrWL = 3 | |
[0059] Since the WRITE latency WL=CL−1, the memory controller is programmed such that McWL=McCL−1=6. Thus, the memory controller is placing the WRITE data on the bus later than in the first example. In this case, the memory controller “thinks” that it needs to do this to meet the DRAM requirements. Unfortunately, the interface circuit(s) further delay the WRITE data over the first example (since now IfWriteDataDelay=1 instead of 0). Now, the WRITE latency requirement may not be met at the DRAM if IfWriteCmdDelay=IfReadCmdDelay as in the first example.
[0060] In one embodiment, the WRITE commands may be delayed by adjusting IfWriteCmdDelay in order to meet the WRITE latency requirement at the DRAM. In this case, the WRITE timing may be expressed around the “loop” formed by IfWriteCmdDelay, McWL, DrWL and IfWriteCmdDelay as shown in Table 11.
[0061]
| TABLE 11 | |
|---|---|
| WRITE: IfWriteCmdDelay = McWL + IfWriteDataDelay − | |
| DrWL = 6 + 1 − 3 = 4 | |
[0062] Since IfWriteCmdDelay=4, and IfReadCmdDelay=2, the WRITE timing requirement corresponds to delaying the WRITE commands by an additional two clock cycles over the READ commands. This additional two-cycle delay may easily be performed by the emulation logic, for example. Note that no changes have to be made to the DRAM and no changes, other than programmed values, have been made to the memory controller. It should be noted that such memory system improvements may be made with minimal or no changes to the memory system itself.
[0063] It should be noted that any combination of DRAM, interface circuit, or system logic delays may be used that result in the system meeting the timing requirements at the DRAM interface in the above examples. For example, instead of introducing a delay of two cycles for the WRITE commands in the second example noted above, the timing of the memory controller may be altered to place the WRITE data on the bus two cycles earlier than normal operation. In another case, the delays may be partitioned between interface logic and the memory controller or partitioned between any two elements in the WRITE data paths.
[0064] Timing adjustments in above examples were described in terms of integer multiples of clock cycles to simplify the descriptions. However, the timing adjustments need not be exact integer multiples of clock cycles. In other embodiments, the adjustments may be made as fractions of clock cycles (e.g. 0.5 cycles, etc.) or any other number (1.5 clock cycles, etc.).
[0065] Additionally, timing adjustments in the above examples were made using constant delays. However, in other embodiments, the timing adjustments need not be constant. For example, different timing adjustments may be made for different commands. Additionally, different timing adjustments may also be made depending on other factors, such as a specific sequence of commands, etc.
[0066] Furthermore, different timing adjustments may be made depending on a user-specified or otherwise specified control, such as power or interface speed requirements, for example. Any timing adjustment may be made at any time such that the timing specifications continue to be met at the memory system interface(s) (e.g. the memory controller and/or DRAM interface). In various embodiments, one or more techniques may be implemented to alter one or more timing parameters and make timing adjustments so that timing requirements are still met.
[0067] The second example noted above was presented for altering timing parameters and adjusting timing in order to add logic which may improve memory system performance. Additionally, the CAS latency timing parameter, CL or tCL, was altered at the memory controller and the timing adjusted using the emulation logic. A non-exhaustive list of examples of other various timing parameters that may be similarly altered are shown in Table 12 (from DDR2 and DDR3 DRAM device data sheets).
[0068]
| TABLE 12 | |
|---|---|
| tAL, Posted CAS Additive Latency | |
| tFAW, 4-Bank Activate Period | |
| tRAS, Active-to-Precharge Command Period | |
| tRC, Active-to-Active (same bank) Period | |
| tRCD, Active-to-Read or Write Delay | |
| tRFC, Refresh-to-Active or Refresh-to-Refresh Period | |
| tRP, Precharge Command Period | |
| tRRD, Active Bank A to Active Bank B Command Period | |
| tRTP, Internal Read-to-Precharge Period | |
| tWR, Write Recovery Time | |
| tWTR, Internal Write-to-Read Command Delay | |
[0069] Of course, any timing parameter or parameters that impose a timing requirement at the memory system interface(s) (e.g. memory controller and/or DRAM interface) may be altered using the timing adjustment methods described here. Alterations to timing parameters may be performed for other similar memory system protocols (e.g. GDDR) using techniques the same or similar to the techniques described herein.
[0070] While various embodiments have been described above, it should be understood that they have been presented by way of example only, and not limitation. Thus, the breadth and scope of a preferred embodiment should not be limited by any of the above-described exemplary embodiments, but should be defined only in accordance with the following claims and their equivalents.
Claims
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The claims shown below may not include correction changes. Use the corrected PDF for authoritative text.
What is claimed is:
1. A system, comprising:
a memory controller;
a memory module, wherein the memory module includes memory devices, the memory devices having an actual CAS (column address strobe) latency; and
an interface circuit coupled to the memory controller, wherein the interface circuit is configured to adjust timing of signals associated with one or more of the memory controller and the memory module,
wherein the memory controller is programmed with a CAS latency parameter set to a value that causes the memory controller to view the memory devices on the memory module as having a higher CAS latency than the actual CAS latency of the memory devices.
2. The system of claim 1, wherein the signals include address signals.
3. The system of claim 1, wherein the signals include control signals.
4. The system of claim 1, wherein the signals include data signals.
5. The system of claim 1, wherein the adjustment of the timing of the signals allows for insertion of additional logic for use in the one or more of the memory controller and the memory module.
6. The system of claim 5, wherein the additional logic improves performance of one or more aspects of the one or more of the memory controller and the memory module.
7. The system of claim 6, wherein the one or more aspects include reliability, accessibility and serviceability (RAS) functions.
8. The system of claim 6, wherein the one or more aspects include power management functions.
9. The system of claim 6, wherein the one or more aspects include mirroring of memory.
10. The system of claim 6, wherein the performance of one or more aspects are improved without physical changes.
11. The system of claim 1, wherein the timing is adjusted based on at least one timing requirement.
12. The system of claim 11, wherein the at least one timing requirement is specified by at least one timing parameter at one or more interfaces included in the one or more of the memory controller and the at least one memory module.
13. The system of claim 12, wherein the adjusting includes modifying one or more delays.
14. The system of claim 12, wherein the at least one timing parameter is modified to allow the adjusting of the timing.
15. The system of claim 1, wherein the timing is adjusted under user control.
16. The system of claim 1, wherein the signals include a command.
17. The system of claim 16, wherein the timing is adjusted based on a type of the command.
18. The system of claim 1, wherein the timing is adjusted based on a sequence of commands.
19. A subsystem, comprising:
an interface circuit configured for communicating with a memory controller and a memory module, wherein the memory module includes memory devices, the memory devices having an actual CAS (column address strobe) latency,
the interface circuit configured for adjusting timing of signals associated with one or more of the memory controller and the memory module,
wherein the memory controller is programmed with a CAS latency parameter set to a value that causes the memory controller to view the memory devices on the memory module as having a higher CAS latency than the actual CAS latency of the memory devices.
20. A method, comprising:
providing at least one interface circuit configured for communicating with a memory controller and a memory module, wherein the memory module includes memory devices, the memory devices having an actual CAS (column address strobe) latency;
adjusting timing of signals associated with one or more of the memory controller and the memory module, utilizing the at least one interface circuit, and
programming the memory controller with a CAS latency parameter set to a value that causes the memory controller to view the memory devices on the memory module as having a higher CAS latency than the actual CAS latency of the memory devices.
21. The apparatus of claim 19, wherein the interface circuit is configured to delay write commands from the memory controller to the memory devices.
22. The apparatus of claim 19, wherein the interface circuit is configured to add a delay to write commands from the memory controller to the memory devices equal to the difference between the the higher CAS latency and the actual CAS latency.
23. The apparatus of claim 19, wherein the interface circuit includes additional logic, the additional logic performing additional functions not accounted for by the memory controller, wherein the difference between the the higher CAS latency and the actual CAS latency is sufficient for the additional logic to perform the additional functions.
24. A system, comprising:
a memory controller;
a memory module, wherein the memory module includes memory devices, the memory devices having an actual CAS (column address strobe) latency; and
an interface circuit coupled to the memory controller,
wherein the memory controller is programmed with a CAS latency parameter set to a value that causes the memory controller to view the memory devices on the memory module as having a higher CAS latency than the actual CAS latency of the memory devices.
25. The system of claim 24, wherein the higher CAS latency is a whole number of clock cycles above the actual CAS latency.
26. The system of claim 24, wherein the higher CAS latency is not a whole number of clock cycles above the actual CAS latency.
27. The system of claim 24, wherein the higher CAS latency is at least two clock cycles above the actual CAS latency.
28. The system of claim 24, wherein the interface circuit is configured to delay write commands from the memory controller to the memory devices.
29. The system of claim 24, wherein the interface circuit is configured to delay write commands from the memory controller to the memory devices by an amount of time equal to the difference between the higher CAS latency and the actual CAS latency.
30. The system of claim 24, wherein the memory module includes additional logic, the additional logic performing additional functions not accounted for by the memory controller, wherein the difference between the higher CAS latency and the actual CAS latency of the memory devices is sufficient for the additional logic to perform the additional functions.
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