WO2013035223A1 - メモリコントローラ及びメモリ制御方法 - Google Patents
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- WO2013035223A1 WO2013035223A1 PCT/JP2012/003478 JP2012003478W WO2013035223A1 WO 2013035223 A1 WO2013035223 A1 WO 2013035223A1 JP 2012003478 W JP2012003478 W JP 2012003478W WO 2013035223 A1 WO2013035223 A1 WO 2013035223A1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/14—Handling requests for interconnection or transfer
- G06F13/16—Handling requests for interconnection or transfer for access to memory bus
- G06F13/1668—Details of memory controller
- G06F13/1689—Synchronisation and timing concerns
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C7/00—Arrangements for writing information into, or reading information out from, a digital store
- G11C7/10—Input/output [I/O] data interface arrangements, e.g. I/O data control circuits, I/O data buffers
- G11C7/1072—Input/output [I/O] data interface arrangements, e.g. I/O data control circuits, I/O data buffers for memories with random access ports synchronised on clock signal pulse trains, e.g. synchronous memories, self timed memories
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C11/00—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor
- G11C11/21—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements
- G11C11/34—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements using semiconductor devices
- G11C11/40—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements using semiconductor devices using transistors
- G11C11/401—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements using semiconductor devices using transistors forming cells needing refreshing or charge regeneration, i.e. dynamic cells
- G11C11/4063—Auxiliary circuits, e.g. for addressing, decoding, driving, writing, sensing or timing
- G11C11/407—Auxiliary circuits, e.g. for addressing, decoding, driving, writing, sensing or timing for memory cells of the field-effect type
- G11C11/409—Read-write [R-W] circuits
- G11C11/4093—Input/output [I/O] data interface arrangements, e.g. data buffers
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C7/00—Arrangements for writing information into, or reading information out from, a digital store
- G11C7/10—Input/output [I/O] data interface arrangements, e.g. I/O data control circuits, I/O data buffers
- G11C7/1051—Data output circuits, e.g. read-out amplifiers, data output buffers, data output registers, data output level conversion circuits
- G11C7/1066—Output synchronization
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C7/00—Arrangements for writing information into, or reading information out from, a digital store
- G11C7/10—Input/output [I/O] data interface arrangements, e.g. I/O data control circuits, I/O data buffers
- G11C7/1078—Data input circuits, e.g. write amplifiers, data input buffers, data input registers, data input level conversion circuits
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C7/00—Arrangements for writing information into, or reading information out from, a digital store
- G11C7/10—Input/output [I/O] data interface arrangements, e.g. I/O data control circuits, I/O data buffers
- G11C7/1078—Data input circuits, e.g. write amplifiers, data input buffers, data input registers, data input level conversion circuits
- G11C7/1093—Input synchronization
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C7/00—Arrangements for writing information into, or reading information out from, a digital store
- G11C7/22—Read-write [R-W] timing or clocking circuits; Read-write [R-W] control signal generators or management
Definitions
- the present invention relates to memory control, more specifically, write leveling performed for a DDR3 memory interface.
- Patent Documents 1 to 3 Signal delay times are adjusted in various semiconductor devices.
- DRAM Dynamic Random Access Memory
- DDR3 memory interface DDR: Double Data Rate
- JEDEC Joint Electron Engineering Engineering Council
- write leveling is defined in which the delay time of the data strobe signal DQS output from the memory controller to each of the plurality of memory elements included in the DIMM is adjusted.
- FIG. 11 is FIG. 19 in Patent Document 4 and schematically shows a connection example between the memory controller 90 and the DIMM 91 compliant with the DDR3 memory interface.
- the clock signal CK, the address signal Add, and the command signal CMD signal lines are n (n: 2) on the memory controller 90 and the DIMM 91.
- the memory elements (SDRAM: Synchronous Dynamic Random Access Memory) 92-1 to 92-n are wired in a daisy chain, and the signal lines of the data signal DQ and the data strobe signal DQS are transmitted from the memory controller 90 to the DIMM 91. Wired to the plurality of SDRAMs 92-1 to 92-n above.
- reference numerals 92-1 to 92-n are used when one of a plurality of SDRAMs needs to be specified, and reference numeral 92 is used when referring to any SDRAM.
- the codes DQ-1 to DQ-n are used when one of the plurality of data signals needs to be specified, and the code DQ is used when indicating an arbitrary data signal.
- the codes DQS-1 to DQS-n are used when one of a plurality of data strobe signals needs to be specified, and the code DQS is used when indicating an arbitrary data strobe signal. Use.
- the clock signal CK output from the memory controller 90 cannot reach all the SDRAMs 92-1 to 92-n at the same time due to the propagation delay caused by the daisy chain wiring of the signal line of the clock signal CK.
- the length L1 of the outer dimension of the DIMM 91 is determined to be 133 mm.
- Write leveling refers to sampling the clock signal CK with the data strobe signal DQS output from the memory controller 90 to detect the phase relationship between the data strobe signal DQS and the clock signal CK, and adjusting the delay time of the data strobe signal DQS. It is a function to perform. As shown in FIG. 12, this function includes variable delay circuits 93-1 to 93-n capable of changing the delay times of the data strobe signals DQS-1 to DQS-n in a memory controller 90. This is realized by incorporating each of the SDRAMs 92-1 to 92-n.
- reference numerals 93-1 to 93-n are used when one of the plurality of delay circuits needs to be specified, and reference numeral 93 is used when referring to an arbitrary delay circuit.
- a CPU Central Processing Unit
- DQS-1 to DQS-n output from the SDRAMs 92-1 to 92-n to the SDRAMs 92, respectively.
- the data strobe signals DQS-1 to DQS-n are converted into SDRAMs 92-1 to 92-n, respectively.
- the delay circuits 93-1 to 93-n delay the data strobe signal DQS by the delay times t1-1 to t1-n, respectively.
- the data strobe signal DQS and the clock signal CK have the same phase.
- write leveling is performed when a memory device having a DDR3 memory interface is initialized. That is, when initialization including write leveling is completed, the delay times t1-1 to t1-n are determined, and the clock signal CK and the data strobe signal DQS are input with the same phase to each SDRAM. .
- JP 2000-206212 A JP 2001-217694 A JP 2009-284266 A JP 2009-077562A
- the DQS delay time (corresponding to the delay times t1-1 to t1-n described above) is normally controlled by a DLL (Delay Locked Loop) circuit.
- DLL Delay Locked Loop
- the wiring of the signal line is restricted with respect to the design of the printed circuit board so that the adjustment width of the delay time of the data strobe signal DQS is 1 clock cycle or less.
- the detection of the phase relationship between the clock signal CK and the data strobe signal DQS at the time of write leveling is performed in synchronization with the data strobe signal DQS having a burst length determined by the standard for each memory element to match the burst length. This is performed based on the result of comparing the read data string with the expected value data string by reading after writing the expected value data string composed of the known data.
- the present invention has been made in view of the above circumstances, and provides a technique that can avoid an increase in initialization time during write leveling.
- One aspect of the present invention is a memory control method.
- light leveling is performed according to the following procedure.
- a DQS control unit that is provided for each memory element included in the memory module corresponding to the DDR3 memory interface and outputs a data strobe signal DQS to the memory element, and is provided for each memory element, and is output to the memory element.
- the DQ control unit that outputs the write data and receives the read data, the delay amount of the output timing of the data strobe signal DQS, the output timing of the write data, and the read data Is adjusted within a range of less than one clock cycle.
- a read data string obtained by reading after writing the expected value data string is compared with the expected value data string, and each of the DQS control units
- the DQ controller adjusts the delay amount of the output timing of the data strobe signal DQS and the delay amount of the write data output timing and the read data reception timing in units of clock cycles.
- the DQS control unit outputs a data strobe signal DQS longer than the burst length determined by the standard by “2 ⁇ M” clock cycles (M: an integer of 1 or more), and the DQ control unit outputs the burst Control is performed so that M pieces of data are added and output before and after the expected value data string corresponding to the length.
- FIG. 11 is a diagram illustrating an example for explaining the significance of data strobe signal and data signal expansion during write leveling (part 1); FIG.
- 10 is a diagram illustrating an example for explaining the significance of data strobe signal and data signal expansion during write leveling (part 2); It is a figure which shows the read data sequence obtained in the case of the example shown in FIG. It is a figure which shows typically the example of a connection based on a DDR3 memory interface. It is a figure for demonstrating write leveling.
- FIG. 1 shows a semiconductor device such as a computer 200 according to an embodiment of the present invention.
- the computer 200 includes a CPU 210, a memory controller 220, and a DIMM 280.
- the DIMM 280 has n (n: integer of 2 or more) SDRAMs 282 (SDRAMs 282-1 to 282-n).
- K K: number
- ⁇ N N: number
- the codes “282-1” to “282-n” are used, and any SDRAM is selected. Only the symbol “282” is used when indicating.
- W English letter
- N number
- DQS-1 when it is necessary to specify one of DQS-1 to DQS-n as a code indicating a data strobe signal, which will be described later, the codes “DQS-1” to “DQS-n” are used. Only the code “DQS” is used when indicating the strobe signal.
- the memory controller 220 includes a first control unit 230, as many second control units 240 (second control units 240-1 to 240-n) as the SDRAM 282, and a write leveling control unit 250.
- Each second control unit 240 includes a DQS control unit 242 and a DQ control unit 244.
- a DDR3 format memory interface is employed. Therefore, among the signal lines connecting the memory controller 220 and the DIMM 28, the clock signal CK, the address signal Add, and the command signal CMD are signals. As for the lines, the memory controller 220 and n SDRAMs 282 on the DIMM 280 are wired in a daisy chain, and the signal lines of the data signal DQ and the data strobe signal DQS are respectively transferred from the memory controller 220 to the n SDRAMs 282 on the DIMM 280. Wired.
- the memory controller 220 is connected to the CPU 210, and performs write leveling on the DIMM 280 in response to a write leveling operation instruction from the CPU 210 at the time of initialization.
- the first control unit 230 in the memory controller 220 outputs a clock signal CK, an address signal Add, and a command signal CMD to the DIMM 280. These signals are supplied to the SDRAMs 282 in the order of SDRAM 282-1, SDRAM 282-2,..., SDRAM 282-n via the signal lines wired in the daisy chain described above.
- the DQS control unit 242 in the second control unit 240 outputs a data strobe signal DQS to the corresponding SDRAM 282, and the DQ control unit 244 sends data (DQ [0]) to the SDRAM 282. ,... DQ [n]).
- the second control unit 240 will be described in detail with reference to FIG.
- the DQS control unit 242 in the second control unit 240 includes a DQS extension control unit 2420, a first delay control unit 2422, and a second delay control unit 2424.
- the DQ control unit 244 The decompression control unit 2440, the first delay control unit 2442, and the second delay control unit 2444 are included.
- the first delay control unit 2422 and the second delay control unit 2424 constitute a DQS delay unit
- the first delay control unit 2442 and the second delay control unit 2444 constitute a DQ delay unit.
- the DQS extension control unit 2420 performs control to increase the number of DQS issued in accordance with an instruction from the write leveling control unit 250.
- the first delay control unit 2422 is configured by a combination of a register and a selector, and can delay the DQS in units of clock cycles.
- the second delay control unit 2424 is configured by a DLL, and can adjust the DQS delay time with a granularity (for example, 1/16 clock cycle) as required within a range of less than one clock cycle.
- the sum of delay times by the first delay control unit 2422 and the second delay control unit 2424 is the DQS delay time.
- the DQ extension control unit 2440 performs control to increase the number of issued DQs according to an instruction from the write leveling control unit 250.
- the first delay control unit 2442 includes a combination of a register and a selector, and can delay DQ in units of clock cycles.
- the second delay control unit 2444 is configured with a DLL, and can adjust the delay time of the DQ with a granularity (for example, 1/16 clock cycle) as required within a range of less than one clock cycle.
- the sum of the delay times by the first delay control unit 2442 and the second delay control unit 2444 is the DQ delay time.
- the light leveling control unit 250 will be described with reference to FIG.
- the write leveling control unit 250 includes a sequence control unit 252, an extension instruction unit 254, and a test operation control unit 256.
- the sequence control unit 252 controls the start of the write leveling and the adjustment of the delay time of DQS, DQ [0],... DQ [n] by the write leveling according to the write leveling operation instruction from the CPU 210. This adjustment is made in two stages by the first delay control unit 2422 and the second delay control unit 2424 in the DQS control unit 242 with respect to DQS, and the first delay control unit 2442 in the DQ control unit 244 with respect to DQ.
- the second delay control unit 2444 performs two steps.
- sequence control unit 252 outputs a write leveling instruction to the first control unit 230, and includes a first delay control unit 2422 and a second delay control unit 2424 in the DQS control unit 242 of the second control unit 240.
- the DQ control unit 244 outputs a delay amount instruction to the first delay control unit 2442 and the second delay control unit 2444, and the DQS control unit 242 includes a DQS expansion control unit 2420 and a DQ control unit 244 performs DQ expansion control.
- the above-described control is realized by causing the decompression instruction unit 254 to output an decompression instruction to the unit 2440 and outputting a test operation instruction to the test operation control unit 256.
- the decompression instruction unit 254 sends an instruction (decompression instruction) to decompress the data strobe signal DQS and the data signal DQ according to the control from the sequence control unit 252 and the DQS decompression control unit 2420 of the DQS control unit 242 in the second control unit 240. , Output to the DQS expansion control unit 2420 of the DQ control unit 244.
- the test operation control unit 256 outputs a write request to the first control unit 230 and the second control unit 240 in response to a test operation instruction from the sequence control unit 252 and reads the first control unit 230. A process of outputting a request and a process of comparing reply data (described later) with an expected value are performed.
- the test operation control unit 256 will be described in detail with reference to FIG.
- the test operation control unit 256 includes a test sequence control unit 262, a write command issue control unit 264, a read command issue control unit 266, and a comparison unit 268.
- the test sequence control unit 262 controls the write command issuance control unit 264, the read command issuance control unit 266, and the comparison unit 268 in accordance with the test operation instruction from the write leveling control unit 250 to read / write data to / from the DIMM 280.
- the write and reply data are compared with the expected value.
- the write command issue control unit 264 issues a write request to the DIMM 280 in accordance with an instruction from the test sequence control unit 262.
- the read command issue control unit 266 issues a read request to the DIMM 280 in accordance with an instruction from the test sequence control unit 262.
- the comparison unit 268 receives the data (reply data) output from the DIMM 280 in response to the read request, compares the reply data with the expected value, and notifies the test sequence control unit 262 of the comparison result.
- the write leveling operation instruction issued from the CPU 210 is received by the sequence control unit 252 in the write leveling control unit 250 of the memory controller 220.
- the write sequence control unit 252 starts the write leveling operation upon reception of the write leveling operation instruction. Adjustment of the delay time in the write leveling operation is performed in two stages. This will be described with reference to the flowcharts of FIGS.
- step S100 the second delay control unit 2424 in the DQS control unit 242 and the second delay control unit 2444 in the DQ control unit 244 are within a range of less than one clock cycle. Adjust the delay time.
- second delay time the delay times of the second delay control unit 2424 and the second delay control unit 2444 are referred to as “second delay time”.
- the adjustment in this step is DQS adjustment based on the clock signal CLK, and is a write leveling operation defined in the DIMM specifications.
- test operation for detecting a clock edge shift between the SDRAMs 282 is started (S102). Specifically, the write leveling control unit 250 issues a test operation instruction to the test operation control unit 256 after completion of the process of step S100. The test operation control unit 256 performs a test operation in response to a test operation instruction from the sequence control unit 252.
- FIG. 6 shows a flowchart of the test operation.
- the test operation control unit 256 issues a write request to the DIMM 280 and writes an expected value data string made up of a plurality of known data (S110).
- Issuance of a write request is performed by sending a write command issue instruction from the test sequence control unit 262 to the write command issue control unit 264.
- the SDRAM 282 cannot write one or more data at the beginning of the expected value data string or one or more data at the end due to a shift in the clock edge between the SDRAMs 282. There is a possibility that the SDRAM 282 needs to be reset.
- the write leveling control unit 250 further sends an extension instruction to the second control units 240-1,... 240-n in this step.
- the DQS decompression control unit 2420 in the DQS control unit 242 of the second control unit 240-1, 240-n is “2 ⁇ M” clock cycles longer than the prescribed burst length (M: 1 or more) in response to the decompression instruction.
- the data strobe signal DQS is issued to the DIMM 280.
- the DQ extension control unit 2440 in the DQ control unit 244 adds M pieces of data before and after the expected value data string corresponding to the specified burst length in response to the extension instruction, and issues the data to the DIMM 280. .
- test sequence control unit 262 issues a read request for reading the data written in step S110 to the DIMM 280 (S112).
- the read request is issued by sending a read command issue instruction from the test sequence control unit 262 to the read command issue control unit 266.
- Reply data (read data string) is output from the DIMM 280 in response to the read request.
- the comparison unit 268 receives this reply data, compares it with the expected value data string, and sends the comparison result to the test sequence control unit 262 (S114). The result of this comparison is further output from the test sequence control unit 262 to the sequence control unit 252.
- the sequence control unit 252 sets the delay amount of the first delay control unit 2422 in the DQS control unit 242 and the first delay control unit 2442 in the DQ control unit 244 based on the comparison result obtained by the comparison unit 268. Then, a delay amount instruction indicating the delay value is sent to the second control units 240-1, 240-2,..., 240-n.
- the delay value set by the sequence control unit 252 in this step is hereinafter referred to as “first delay time”.
- the first delay time is an integral multiple (including 0 times) of the clock cycle.
- Each of the first delay control unit 2422 and the first delay control unit 2442 adjusts the delay time corresponding to the first delay time set by the test sequence control unit 262. This completes the write leveling.
- the adjustment of the delay time in the write leveling is performed in two stages.
- the second delay control unit 2424 and the second delay control unit 2444 each perform a delay time (second delay within one clock cycle). Time) adjustments are made.
- the second delay time adjustment amount A2-1 is set to match the T1 edge of the clock signal
- the T1 edge of the clock signal is set.
- adjustment is performed with the second delay time adjustment amount A2-2.
- the SDRAM 282-n is adjusted by the second delay time adjustment amount A 2-n in order to match the T 0 edge of the clock signal.
- ADD / CMD is assumed to be aligned with the T1 edge of the clock signal.
- the test operation shown in FIG. 6 is performed.
- an expected value is written to the DIMM 280 by a write request.
- the SDRAM 282-n is synchronized with the T1 in which ADD / CMD is synchronized. Since the expected value arrives at the T0 edge that is one cycle (1T) earlier than the edge, the specification is violated as shown in FIG. This will be specifically described with reference to FIG. In FIG.
- ACT and WRA have the same meaning as defined in the specifications of DDR3 of JEDEC, and are mnemonic expressions of the “Activate” instruction and the “Write + AutoPrecharge” instruction, respectively. is there.
- WL Write Latency
- ACT and WRA have the same meaning as defined in the specifications of DDR3 of JEDEC, and indicates the data output timing in the write instruction.
- the SDRAM 282 since the relationship between ADD / CMD and write data matches, the normal burst length DQS and the number of data matching the normal burst length Is issued, the SDRAM 282 is not required to be reset.
- DQS / DQ [0],... DQ [n] is synchronized with the T0 edge of CLK, and therefore arrives at SDRAM 282-n 1T earlier than ADD / CMD. become. For this reason, there is no way to restore data except that the end of the data is cut off and the posttable is invalid and reset is performed.
- the extension of DQS and DQ is a process for avoiding this state.
- the DQS decompression control unit 2420 in the DQS control unit 242 of the second control unit 240-1,..., 240-n sets the DQS to “2 ⁇ M ”cycles and issues to DIMM 280.
- the DQ extension control unit 2440 in the DQ control unit 244 also extends the DQ by M cycles both before and after and issues it to the DIMM 280.
- DQS / DQ [0],..., DQ [n] extends for 2T before and after the original output position (burst 8). Therefore, the SDRAM 282-n does not fall into a specification violation state. Therefore, the SDRAM does not enter an indefinite state, and the SDRAM reset operation becomes unnecessary.
- data 4, 5, 6, 7, 8, 9, A and B are written in the SDRAM 282-1 and SDRAM 282-2, and data 6, 7, 8, 9, A and B are written in the SDRAM 282-n.
- B, C, D are written.
- the reply data is transmitted from each SDRAM 282 to the comparison unit 268 in response to the read request, and compared with the expected values (4, 5, 6, 7, 8, 9, A, B).
- the reply data since the reply data is returned as shown in FIG. 10, it matches the expected value for the SDRAMs 282-1 and 282-2, and the SDRAM 282-n is two times before the expected value. It will be off.
- the comparison unit 268 compares the test sequence control unit 262 with, for example, “0” (match) for the SDRAMs 282-1 and 282-2, and “ ⁇ 1” (1T earlier) for the SDRAM 282-n.
- the test sequence control unit 262 further outputs each comparison result to the sequence control unit 252.
- the sequence control unit 252 determines an adjustment amount of each first delay time based on these comparison results, and gives a delay amount instruction indicating each delay amount to the first delay control unit 2422 and the first delay time.
- the data is output to the delay control unit 2442.
- the first delay control unit 2422 and the first delay control unit 2442 corresponding to the SDRAM 282-1 and SDRAM 282-2 become “0” indicating “no delay time”.
- a delay amount instruction is output, and becomes “ ⁇ 1” indicating “adjust delay time by ⁇ 1 clock cycle” for the first delay control unit 2422 and the first delay control unit 2442 corresponding to the SDRAM 282-n.
- a delay amount instruction is output.
- Each first delay control unit 2422 and first delay control unit 2442 set a delay time corresponding to the received delay amount instruction. As a result, the shift between ADD / CMD and DQS / DQ is also eliminated for the SDRAM 282-n.
- the data strobe signal DQS is longer by “2 ⁇ M” cycles than the burst length determined by the standard when writing the expected value data string.
- the data is decompressed, and M pieces of data are added before and after the expected value data string and output. Therefore, even in the case of the SDRAM 282 in which the edges of the data strobe signal DQS and the clock signal CK are shifted, a state in which the SDRAM 282 has to be reset due to the lack of data to be written is avoided, and thus the initialization time is long. Can be avoided.
- the data strobe signal DQS and the data signal DQ are first finely adjusted within a range of less than one cycle by the second delay control unit 2424 and the second delay control unit 2444, which are DLL circuits. Then, by performing coarse adjustment in units of cycles by the first delay control unit 2422 and the first delay control unit 2442 which are a combination of a register and a selector, a memory in which the difference between the clock signal CK and the data strobe signal DQS is large. Even in the case of the apparatus, the delay time of the data strobe signal DQS can be adjusted with high accuracy.
- the delay is realized by two delay circuits having different adjustment granularities. Two delays may be realized by one delay circuit. In this case, although the accuracy of adjustment is inferior to that of the computer 200, an effect of avoiding an increase in the initialization time can be obtained similarly.
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Abstract
Description
DQS伸長制御部2420は、ライトレベリング制御部250からの指示に従ってDQSの発行個数を増やす制御を行う。
DQ伸長制御部2440は、ライトレベリング制御部250からの指示に従ってDQの発行個数を増やす制御を行う。
92 SDRAM 93 遅延回路
200 コンピュータ 210 CPU
220 メモリコントローラ 230 第1の制御部
240 第2の制御部 242 DQS制御部
2420 DQS伸長制御部 2422 第1の遅延制御部
2424 第2の遅延制御部 244 DQ制御部
2440 DQ伸長制御部 2442 第1の遅延制御部
2444 第2の遅延制御部 250 ライトレベリング制御部
252 シーケンス制御部 254 伸長指示部
256 テスト動作制御部 262 テストシーケンス制御部
264 ライト命令発行制御部 266 リード命令発行制御部
268 比較部 280 DIMM
282 SDRAM Add アドレス信号
CK クロック信号 CMD コマンド信号
DQ データ信号 DQS データストローブ信号
Claims (4)
- DDR3メモリインタフェースに対応するメモリモジュールと接続されたメモリコントローラであって、
前記メモリモジュールに含まれるメモリ素子毎に設けられ、該メモリ素子にデータストローブ信号DQSを出力するDQS制御手段と、
前記メモリモジュールに含まれるメモリ素子毎に設けられ、該メモリ素子に出力される前記データストローブ信号DQSに同期して、ライトデータの出力とリードデータの受信を行うDQ制御手段と、
初期化時に行われるライトレベリングの制御を行うライトレベリング制御手段とを備え、
前記DQS制御手段は、前記データストローブ信号DQSの出力タイミングを、前記ライトレベリング制御手段により設定された遅延量の分遅延させるDQS遅延手段を有し、
前記DQ制御手段は、ライトデータの出力タイミングとリードデータの受信タイミングを、前記ライトレベリング制御手段により設定された遅延量の分遅延させるDQ遅延手段を有し、
前記ライトレベリング制御手段は、ライトレベリング時に、
前記DQS遅延手段と前記DQ遅延手段に対して1クロックサイクル未満の遅延量の調整を行った後に、夫々の前記メモリ素子に対して、期待値データ列のライト後にリードを行って得たリードデータ列と前記期待値データ列とを比較し、比較結果に応じて各前記DQS遅延手段と前記DQ遅延手段に対して、クロックサイクル単位の遅延量の調整を行うものであり、
前記ライト時に、前記DQS制御手段が規格により定められたバースト長より「2×M」クロックサイクル長い(M:1以上の整数)データストローブ信号DQSを出力し、前記DQ制御手段が前記バースト長に合致する個数の前記期待値データ列の前後にM個ずつデータを加えて出力するように制御することを特徴とするメモリコントローラ。 - 前記DQS遅延手段は、
1クロックサイクル以上の遅延量の遅延が可能な第1のDQS遅延手段と、
1クロックサイクル未満の遅延量が可能な第2のDQS遅延手段とを有し、
前記DQ遅延手段は、
1クロックサイクル以上の遅延量の遅延が可能な第1のDQ遅延手段と、
1クロックサイクル未満の遅延量が可能な第2のDQ遅延手段とを有し、
前記ライトレベリング制御手段は、
前記第2のDQS遅延手段と前記第2のDQ遅延手段の遅延量を設定することにより前記1クロックサイクル未満の遅延量の調整を行い、
前記第1のDQS遅延手段と前記第1のDQ遅延手段の遅延量を設定することにより前記クロックサイクル単位の遅延量の調整を行うことを特徴とする請求項1に記載のメモリコントローラ。 - 前記第1のDQS遅延手段と前記第1のDQ遅延手段は、レジスタとセレクタの組合せであり、
前記第2のDQS遅延手段と前記第2のDQ遅延手段は、DLL回路であることを特徴とする請求項2に記載のメモリコントローラ。 - DDR3メモリインタフェースに対応するメモリモジュールに含まれるメモリ素子毎に設けられ、該メモリ素子にデータストローブ信号DQSを出力するDQS制御手段と、前記メモリ素子毎に設けられ、該メモリ素子に出力される前記データストローブ信号DQSに同期して、ライトデータの出力とリードデータの受信を行うDQ制御手段に対して、前記データストローブ信号DQSの出力タイミングの遅延量と、ライトデータの出力タイミング及びリードデータの受信タイミングの遅延量とを、1クロックサイクル未満の範囲内で調整し、
夫々の前記メモリ素子に対して、期待値データ列のライト後にリードを行って得たリードデータ列と前記期待値データ列とを比較し、比較結果に応じて、各前記DQS制御手段と前記DQ制御手段に対して、前記データストローブ信号DQSの出力タイミングの遅延量と、ライトデータの出力タイミング及びリードデータの受信タイミングの遅延量とを、クロックサイクル単位で調整し、
前記ライト時に、前記DQS制御手段が規格により定められたバースト長より「2×M」クロックサイクル長い(M:1以上の整数)データストローブ信号DQSを出力し、前記DQ制御手段が前記バースト長に合致する個数の前記期待値データ列の前後にM個ずつデータを加えて出力するように制御することを特徴とするメモリ制御方法。
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US8117483B2 (en) * | 2009-05-13 | 2012-02-14 | Freescale Semiconductor, Inc. | Method to calibrate start values for write leveling in a memory system |
KR102147228B1 (ko) | 2014-01-23 | 2020-08-24 | 삼성전자주식회사 | 타겟 모듈의 라이트 레벨링을 제어하는 라이트 레벨링 제어 회로 및 그에 따른 라이트 레벨링 제어방법 |
US9478268B2 (en) * | 2014-06-12 | 2016-10-25 | Qualcomm Incorporated | Distributed clock synchronization |
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US10418090B1 (en) * | 2018-06-21 | 2019-09-17 | Micron Technology, Inc. | Write signal launch circuitry for memory drive |
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Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000206212A (ja) | 1999-01-11 | 2000-07-28 | Asia Electronics Inc | 半導体試験方法および半導体試験装置 |
JP2001217694A (ja) | 2000-02-04 | 2001-08-10 | Nec Corp | 遅延調整回路及びこれを用いたクロック生成回路 |
JP2009075682A (ja) | 2007-09-18 | 2009-04-09 | Fujitsu Ltd | メモリ制御回路,遅延時間制御装置,遅延時間制御方法および遅延時間制御プログラム |
JP2009130455A (ja) * | 2007-11-20 | 2009-06-11 | Fujitsu Ltd | 可変遅延回路,メモリ制御回路,遅延量設定装置,遅延量設定方法および遅延量設定プログラム |
JP2009284266A (ja) | 2008-05-22 | 2009-12-03 | Elpida Memory Inc | Dll回路 |
WO2011077573A1 (ja) * | 2009-12-25 | 2011-06-30 | 富士通株式会社 | 信号受信回路、メモリコントローラ、プロセッサ、コンピュータ及び位相制御方法 |
WO2011077574A1 (ja) * | 2009-12-25 | 2011-06-30 | 富士通株式会社 | 信号復元回路、レイテンシ調整回路、メモリコントローラ、プロセッサ、コンピュータ、信号復元方法及びレイテンシ調整方法 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7969799B2 (en) * | 2007-10-09 | 2011-06-28 | Lsi Corporation | Multiple memory standard physical layer macro function |
JP5305543B2 (ja) | 2007-12-21 | 2013-10-02 | ラムバス・インコーポレーテッド | メモリシステムの書き込みタイミングを較正する方法および装置 |
US8098535B2 (en) * | 2009-03-30 | 2012-01-17 | Cadence Design Systems, Inc. | Method and apparatus for gate training in memory interfaces |
-
2011
- 2011-09-06 JP JP2011194242A patent/JP5807952B2/ja active Active
-
2012
- 2012-05-28 EP EP12830031.6A patent/EP2755140B1/en active Active
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- 2012-05-28 US US14/342,263 patent/US9305617B2/en not_active Expired - Fee Related
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000206212A (ja) | 1999-01-11 | 2000-07-28 | Asia Electronics Inc | 半導体試験方法および半導体試験装置 |
JP2001217694A (ja) | 2000-02-04 | 2001-08-10 | Nec Corp | 遅延調整回路及びこれを用いたクロック生成回路 |
JP2009075682A (ja) | 2007-09-18 | 2009-04-09 | Fujitsu Ltd | メモリ制御回路,遅延時間制御装置,遅延時間制御方法および遅延時間制御プログラム |
JP2009130455A (ja) * | 2007-11-20 | 2009-06-11 | Fujitsu Ltd | 可変遅延回路,メモリ制御回路,遅延量設定装置,遅延量設定方法および遅延量設定プログラム |
JP2009284266A (ja) | 2008-05-22 | 2009-12-03 | Elpida Memory Inc | Dll回路 |
WO2011077573A1 (ja) * | 2009-12-25 | 2011-06-30 | 富士通株式会社 | 信号受信回路、メモリコントローラ、プロセッサ、コンピュータ及び位相制御方法 |
WO2011077574A1 (ja) * | 2009-12-25 | 2011-06-30 | 富士通株式会社 | 信号復元回路、レイテンシ調整回路、メモリコントローラ、プロセッサ、コンピュータ、信号復元方法及びレイテンシ調整方法 |
Non-Patent Citations (1)
Title |
---|
See also references of EP2755140A4 |
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