DDR SDRAM (Rev.1.0) MITSUBISHI LSIs M2S56D20/ 30/ 40AKT Jul. '01 Preliminary 256M Double Data Rate Synchronous DRAM PRELIMINARY Some of contents are subject to change without notice. DESCRIPTION M2S56D20AKT is a 4-bank x 16,777,216-word x 4-bit, M2S56D30AKT is a 4-bank x 8,388,608-word x 8-bit, M2S56D40AKT is a 4-bank x 4,194,304-word x 16-bit, double data rate synchronous DRAM, with SSTL_2 interface. All control and address signals are referenced to the rising edge of CLK. Input data is registered on both edges of data strobe, and output data and data strobe are referenced on both edges of CLK. The M2S56D20/30/40AKT achieves very high speed data rate up to 133MHz, and are suitable for main memory in computer systems. FEATURES - Vdd=Vddq=2.5V+0.2V - Double data rate architecture; two data transfers per clock cycle - Bidirectional, data strobe (DQS) is transmitted/received with data - Differential clock inputs (CLK and /CLK) - DLL aligns DQ and DQS transitions with CLK transitions edges of DQS - Commands entered on each positive CLK edge; - data and data mask referenced to both edges of DQS - 4 bank operation controlled by BA0, BA1 (Bank Address) - /CAS latency- 2.0/2.5 (programmable) - Burst length- 2/4/8 (programmable) - Burst type- sequential / interleave (programmable) - Auto precharge / All bank precharge controlled by A10 - 8192 refresh cycles /64ms (4 banks concurrent refresh) - Auto refresh and Self refresh - Row address A0-12 / Column address A0-9,11(x4)/ A0-9(x8)/ A0-8(x16) - SSTL_2 Interface - 400-mil, 66-pin Thin Small Outline Package (TSOP II) - JEDEC standard Operating Frequencies Speed Grade Clock Rate CL=2 * CL=2.5 * -75A 133MHz 133MHz -75 100MHz 133MHz -10 100MHz 125MHz * CL = CAS(Read) Latency MITSUBISHI ELECTRIC 1 DDR SDRAM (Rev.1.0) MITSUBISHI LSIs M2S56D20/ 30/ 40AKT Jul. '01 Preliminary 256M Double Data Rate Synchronous DRAM PIN CONFIGURATION(TOP VIEW) CLK,/CLK CKE /CS /RAS /CAS /WE DQ0-7 DQS DM Vref VDD DQ0 VDDQ NC DQ1 VSSQ NC DQ2 VDDQ NC DQ3 VSSQ NC VDDQ NC NC VDD NC NC /WE /CAS /RAS /CS NC BA0 BA1 A10/AP A0 A1 A2 A3 VDD VDD DQ0 VDDQ DQ1 DQ2 VSSQ DQ3 DQ4 VDDQ DQ5 DQ6 VSSQ DQ7 VDDQ LDQS NC VDD NC LDM /WE /CAS /RAS /CS NC BA0 BA1 A10/AP A0 A1 A2 A3 VDD 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 : Master Clock : Clock Enable : Chip Select : Row Address Strobe : Column Address Strobe : Write Enable : Data I/O : Data Strobe : Write Mask : Reference Voltage PIN PITCH 0.4 mm VDD NC VDDQ NC DQ0 VSSQ NC NC VDDQ NC DQ1 VSSQ NC VDDQ NC NC VDD NC NC /WE /CAS /RAS /CS NC BA0 BA1 A10/AP A0 A1 A2 A3 VDD 64pin STSOP X4 X8 X 16 64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 A0-12 BA0,1 Vdd VddQ Vss VssQ MITSUBISHI ELECTRIC VSS DQ15 VSSQ DQ14 DQ13 VDDQ DQ12 DQ11 VSSQ DQ10 DQ9 VDDQ DQ8 VSSQ UDQS NC VREF VSS UDM /CLK CLK CKE NC A12 A11 A9 A8 A7 A6 A5 A4 VSS VSS VSS DQ7 NC VSSQ VSSQ NC NC DQ6 DQ3 VDDQ VDDQ NC NC DQ5 NC VSSQ VSSQ NC NC DQ4 DQ2 VDDQ VDDQ NC NC VSSQ VSSQ DQS DQS NC NC VREF VREF VSS VSS DM DM /CLK /CLK CLK CLK CKE CKE NC NC A12 A12 A11 A11 A9 A9 A8 A8 A7 A7 A6 A6 A5 A5 A4 A4 VSS VSS : Address Input : Bank Address Input : Power Supply : Power Supply for Output : Ground : Ground for Output 2 DDR SDRAM (Rev.1.0) MITSUBISHI LSIs M2S56D20/ 30/ 40AKT Jul. '01 Preliminary 256M Double Data Rate Synchronous DRAM PIN FUNCTION SYMBOL CLK, /CLK TYPE Input DESCRIPTION Clock: CLK and /CLK are differential clock inputs. All address and control input signals are sampled on the crossing of the positive edge of CLK and negative edge of /CLK. Output (read) data is referenced to the crossings of CLK and /CLK (both directions of crossing). CKE Input Clock Enable: CKE controls internal clock. When CKE is low, internal clock for the following cycle is ceased. CKE is also used to select auto / self refresh. After self refresh mode is started, CKE becomes asynchronous input. Self refresh is maintained as long as CKE is low. /CS Input Chip Select: When /CS is high, any command means No Operation. /RAS, /CAS, /WE Input Combination of /RAS, /CAS, /WE defines basic commands. A0-12 Input A0-11 specify the Row / Column Address in conjunction with BA0,1. The Row Address is specified by A0-12. The Column Address is specified by A0-9,11(x4), A0-9(x8) and A0-8(x16). A10 is also used to indicate precharge option. When A10 is high at a read / write command, an auto precharge is performed. When A10 is high at a precharge command, all banks are precharged. BA0,1 Input Bank Address: BA0,1 specifies one of four banks to which a command is applied. BA0,1 must be set with ACT, PRE, READ, WRITE commands. DQ0-15(x16), DQ0-7(x8), Input / Output Data Input/Output: Data bus Input / Output Data Strobe: Output with read data, input with write data. Edge-aligned with read data, centered in write data. Used to capture write data. For the x16, LDQS corresponds to the data on DQ0-DQ7; UDQS correspond to the data on DQ8-DQ15 DQ0-3(x4), DQS DM Input Input Data Mask: DM is an input mask signal for write data. Input data is masked when DM is sampled HIGH along with that input data during a WRITE access. DM is sampled on both edges of DQS. Although DM pins are input only, the DM loading matches the DQ and DQS loading. For the x16, LDM corresponds to the data on DQ0-DQ7; UDM corresponds to the data on DQ8-DQ15. Vdd, Vss Power Supply Power Supply for the memory array and peripheral circuitry. VddQ, VssQ Power Supply VddQ and VssQ are supplied to the Output Buffers only. Vref Input SSTL_2 reference voltage. MITSUBISHI ELECTRIC 3 DDR SDRAM (Rev.1.0) MITSUBISHI LSIs M2S56D20/ 30/ 40AKT Jul. '01 Preliminary 256 M D o u b l e D a t a R a t e S y n c h r o n o u s D R A M DQ0 - 15 UDQS,LDQS I/O Buffer QS Buffer BLOCK DIAGRAM DLL Memory Memory Memory Memory Array Array Array Array Bank #0 Bank #1 Bank #2 Bank #3 Mode Register Control Circuitry Address Buffer Control Signal Buffer Clock Buffer A 0-12 /CS BA0,1 /RAS /CAS / WE C L K /C L K C K E Type Designation Code UDM, LDM This rule is applied to only Synchronous DRAM family. M 2 S 56 D 3 0 A TP –75A Speed Grade 10: 125 MHz@CL=2.5,100MHz@CL=2.0 75: 133 MHz@CL=2.5,100MHz@CL=2.0 75 A: 133MHz@CL=2.5,133MHz@CL=2.0 Package Type TP: TSOP(II) Process Generation Function Reserved for Future Use n Organization 2 2: x4, 3: x8, 4: x16 D DR Synchronous DRAM Density 56: 256M bits Interface V:LVTTL, S:SSTL_3, _2 Memory Style (DRAM) Mitsubishi Main Designation MITSUBISHI ELECTRIC 4 DDR SDRAM (Rev.1.0) MITSUBISHI LSIs M2S56D20/ 30/ 40AKT Jul. '01 Preliminary 256 M D o u b l e D a t a R a t e S y n c h r o n o u s D R A M BASIC FUNCTIONS The M2S56D20/30/40AKT provides basic functions, bank (row) activate, burst read / write, bank (row) precharge, and auto / self refresh. Each command is defined by control signals of /RAS, /CAS and /WE at CLK rising edge. In addition to 3 signals, /CS ,CKE and A10 are used as chip select, refresh option, and precharge option, respectively. To know the detailed definition of commands, please see the command truth table. /CLK CLK /CS Chip Select : L=select, H=deselect /RAS Command /CAS Command /WE Command CKE Refresh Option @refresh command A10 Precharge Option @precharge or read/write command define basic commands Activate (ACT) [/RAS =L, /CAS =/WE =H] ACT command activates a row in an idle bank indicated by BA. Read (READ) [/RAS =H, /CAS =L, /WE =H] READ command starts burst read from the active bank indicated by BA. First output data appears after /CAS latency. When A10 =H at this command, the bank is deactivated after the burst read (autoprecharge, READA) Write (WRITE) [/RAS =H, /CAS =/WE =L] WRITE command starts burst write to the active bank indicated by BA. Total data length to be written is set by burst length. When A10 =H at this command, the bank is deactivated after the burst write (auto-precharge, WRITEA) Precharge (PRE) [/RAS =L, /CAS =H, /WE =L] PRE command deactivates the active bank indicated by BA. This co mmand also terminates burst read /write operation. When A10 =H at this command, all banks are deactivated (precharge all, PREA ). Auto-Refresh (REFA) [/RAS =/CAS =L, /WE =CKE =H] REFA command starts auto-refresh cycle. Refresh address including bank address are generated internally. After this command, the banks are precharged automatically. MITSUBISHI ELECTRIC 5 DDR SDRAM (Rev.1.0) MITSUBISHI LSIs M2S56D20/ 30/ 40AKT Jul. '01 Preliminary 256 M D o u b l e D a t a R a t e S y n c h r o n o u s D R A M COMMAND TRUTH TABLE CKE CKE A10 A0-9, n-1 n /AP 11-12 DESEL H X X X No Operation NOP H X X X Row Address Entry & Bank Activate H H V V V L H L V L X L L H L X H X H L H L L V L V H H L H L L V H V READ H H L H L H V L V READA H H L H L H V H V Auto-Refresh REFA H H L L L H X X X Self-Refresh Entry REFS H L L L L H X X X Self-Refresh Exit REFSX L H H X X X X X X L H L H H H X X X COMMAND MNEMONIC /CS /RAS /CAS /WE BA0,1 Deselect X H X X X H X L H H ACT H H L L Single Bank Precharge PRE H H L Precharge All Banks PREA H H Column Address Entry & Write WRITE H WRITEA Column Address Entry & Write with note Auto-Precharge Column Address Entry & Read Column Address Entry & Read with Auto-Precharge Burst Terminate TERM H H L H H L X X X 1 Mode Register Set MRS H H L L L L L L V 2 H=High Level, L=Low Level, V=Valid, X=Don't Care, n=CLK cycle number NOTE: 1. Applies only to read bursts with autoprecharge disabled; this command is undefined (and should not be used) for read bursts with autoprecharge enabled, and for write bursts. 2. BA0-BA1 select either the Base or the Extended Mode Register (BA0 = 0, BA1 = 0 selects Mode Register;BA0=1 , BA1 = 0 selects Extended Mode Register; other combinations of BA0-BA1 are reserved; A0-A12 provide the op-code to be written to the selected Mode Register. MITSUBISHI ELECTRIC 6 DDR SDRAM (Rev.1.0) MITSUBISHI LSIs M2S56D20/ 30/ 40AKT Jul. '01 Preliminary 256 M D o u b l e D a t a R a t e S y n c h r o n o u s D R A M FUNCTION TRUTH TABLE Current State IDLE / C S /RAS Command Action Notes H X X X X DESEL NOP L H H H X NOP NOP L H H L BA TERM ILLEGAL 2 L H L X BA, CA, A10 READ / WRITE ILLEGAL 2 L L H H BA, RA ACT Bank Active, Latch RA L L H L BA, A10 PRE / PREA NOP 4 L L L H X REFA Auto-Refresh 5 MRS Mode Register Set 5 L ROW ACTIVE / C A S / W E Address L L L Op-Code, ModeAdd H X X X X DESEL NOP L H H H X NOP NOP L H H L BA TERM NOP L H L H BA, CA, A10 READ / READA L H L L BA, CA, A10 WRITE / WRITEA L L H H BA, RA ACT Bank Active / ILLEGAL L L H L BA, A10 PRE / PREA Precharge / Precharge All L L L H X REFA ILLEGAL L L L L MRS ILLEGAL READ(Auto- H X X X X DESEL NOP (Continue Burst to END) Precharge L H H H X NOP NOP (Continue Burst to END) Disabled) L H H L BA TERM Terminate Burst L H L H BA, CA, A10 READ / READA Op-Code, ModeAdd Begin Read, Latch CA, Determine Auto-Precharge Begin Write, Latch CA, Determine Auto-Precharge 2 Terminate Burst, Latch CA, Begin New Read, Determine Auto- 3 Precharge L H L L BA, CA, A10 WRITE / WRITEA ILLEGAL L L H H BA, RA ACT Bank Active / ILLEGAL L L H L BA, A10 PRE / PREA Terminate Burst, Precharge L L L H X REFA ILLEGAL L L L L MRS ILLEGAL Op-Code, ModeAdd MITSUBISHI ELECTRIC 2 7 DDR SDRAM (Rev.1.0) MITSUBISHI LSIs M2S56D20/ 30/ 40AKT Jul. '01 Preliminary 256 M D o u b l e D a t a R a t e S y n c h r o n o u s D R A M FUNCTION TRUTH TABLE (continued) Command Action WRITE(AutoPrecharge Current State H X X X X DESEL NOP (Continue Burst to END) L H H H X NOP NOP (Continue Burst to END) Disabled) L H H L BA TERM ILLEGAL L H L H BA, CA, A10 READ / READA L H L L BA, CA, A10 WRITE / WRITEA L L H H BA, RA ACT Write, Determine Auto-Precharge Bank Active / ILLEGAL L L H L BA, A10 PRE / PREA Terminate Burst, Precharge L L L H X REFA ILLEGAL READ with Auto-Precharge WRITE with Auto-Precharge /CS /RAS /CAS /WE Address Terminate Burst, Latch CA, Begin Read, Determine Auto-Precharge Terminate Burst, Latch CA, Begin Notes 3 3 2 L L L L H X X X Op-Code, ModeMRS Add X DESEL L H H H X NOP NOP (Continue Burst to END) L H H L BA TERM ILLEGAL L H L H BA, CA, A10 READ / READA ILLEGAL for Same Bank 6 L H L L BA, CA, A10 WRITE / WRITEA ILLEGAL for Same Bank 6 L L H H BA, RA ACT Bank Active / ILLEGAL 2 L L H L BA, A10 PRE / PREA Precharge / ILLEGAL 2 L L L H X REFA ILLEGAL L L L L Op-Code, ModeMRS Add ILLEGAL H X X X X DESEL NOP (Continue Burst to END) L H H H X NOP NOP (Continue Burst to END) L H H L BA TERM ILLEGAL L L L H H L L L H H L H BA, CA, A10 BA, CA, A10 BA, RA READ / READA WRITE / WRITEA ACT ILLEGAL for Same Bank ILLEGAL for Same Bank Bank Active / ILLEGAL 7 7 2 L L H L BA, A10 PRE / PREA Precharge / ILLEGAL 2 L L L H X REFA ILLEGAL L L L L Op-Code, ModeMRS Add MITSUBISHI ELECTRIC ILLEGAL NOP (Continue Burst to END) ILLEGAL 8 DDR SDRAM (Rev.1.0) MITSUBISHI LSIs M2S56D20/ 30/ 40AKT Jul. '01 Preliminary 256 M D o u b l e D a t a R a t e S y n c h r o n o u s D R A M FUNCTION TRUTH TABLE (continued) Current State PRECHARGING ROW ACTIVATING WRITE RECOVERING /CS /RAS /CAS /WE Address Command Action Notes H X X X X DESEL NOP (Idle after tRP) L H H H X NOP NOP (Idle after tRP) L H H L BA TERM ILLEGAL 2 L H L X BA, CA, A10 READ / WRITE ILLEGAL 2 L L H H BA, RA ACT ILLEGAL 2 L L H L BA, A10 PRE / PREA NOP (Idle after tRP) 4 L L L H X REFA ILLEGAL ILLEGAL L L L L Op-Code, ModeMRS Add H X X X X DESEL NOP (Row Active after tRCD) L H H H X NOP NOP (Row Active after tRCD) L H H L BA TERM ILLEGAL 2 L H L X BA, CA, A10 READ / WRITE ILLEGAL 2 L L H H BA, RA ACT ILLEGAL 2 L L H L BA, A10 PRE / PREA ILLEGAL 2 L L L H X REFA ILLEGAL L L L L H X X X Op-Code, ModeMRS Add X DESEL L H H H X NOP NOP L H H L BA TERM ILLEGAL 2 L L H L L H X H BA, CA, A10 BA, RA READ / WRITE ACT ILLEGAL ILLEGAL 2 2 L L H L BA, A10 PRE / PREA ILLEGAL 2 L L L H X REFA ILLEGAL L Op-Code, ModeMRS Add L L L MITSUBISHI ELECTRIC ILLEGAL NOP ILLEGAL 9 DDR SDRAM (Rev.1.0) MITSUBISHI LSIs M2S56D20/ 30/ 40AKT Jul. '01 Preliminary 256 M D o u b l e D a t a R a t e S y n c h r o n o u s D R A M FUNCTION TRUTH TABLE (continued) Current State REFRESHING / C S /RAS /CAS / W E Address Command Action H X X X X DESEL NOP (Idle after tRC) L H H H X NOP NOP (Idle after tRC) L H H L BA TERM ILLEGAL L H L X BA, CA, A10 READ / WRITE ILLEGAL L L H H BA, RA ACT ILLEGAL L L H L BA, A10 PRE / PREA ILLEGAL L L L H X REFA ILLEGAL ILLEGAL L L L L Op-Code, ModeMRS Add MODE REGISTER H X X X X DESEL NOP (Row Active after tRSC) L H H H X NOP NOP (Row Active after tRSC) SETTING L H H L BA TERM ILLEGAL L H L X BA, CA, A10 READ / WRITE ILLEGAL L L H H BA, RA ACT ILLEGAL L L H L BA, A10 PRE / PREA ILLEGAL L L L H X REFA ILLEGAL L L L L Op-Code, ModeMRS Add Notes ILLEGAL ABBREVIATIONS: H=High Level, L=Low Level, X=Don't Care BA=Bank Address, RA=Row Address, CA=Column Address, NOP=No Operation NOTES: 1. All entries assume that CKE was High during the preceding clock cycle and the current clock cycle. 2. ILLEGAL to bank in specified state; function may be legal in the bank indicated by BA, depending on the state of that bank. 3. Must satisfy bus contention, bus turn around, write recovery requirements. 4. NOP to bank precharging or in idle state. May precharge bank indicated by BA. 5. ILLEGAL if any bank is not idle. 6. Refer to Read with Auto -Precharge in page 24. 7. Refer to Write with Auto-Precharge in page 26. ILLEGAL = Device operation and/or data-integrity are not guaranteed. MITSUBISHI ELECTRIC 10 DDR SDRAM (Rev.1.0) MITSUBISHI LSIs M2S56D20/ 30/ 40AKT Jul. '01 Preliminary 256 M D o u b l e D a t a R a t e S y n c h r o n o u s D R A M FUNCTION TRUTH TABLE for CKE Current State SELFREFRESHING POWER DOWN ALL BANKS IDLE CKE n-1 CKE n /CS /RAS /CAS /WE Address Action Notes H X X X X X X INVALID 1 L H H X X X X Exit Self-Refresh (Idle after tRC) 1 L H L H H H X Exit Self-Refresh (Idle after tRC) 1 L H L H H L X ILLEGAL 1 L H L H L X X ILLEGAL 1 L H L L X X X ILLEGAL 1 L L X X X X X NOP (Maintain Self-Refresh) 1 H X X X X X X INVALID L H X X X X X Exit Power Down to Idle L L X X X X X NOP (Maintain Self-Refresh) H H X X X X X Refer to Function Truth Table 2 H L L L L H X Enter Self-Refresh 2 H L H X X X X Enter Power Down 2 H L L H H H X Enter Power Down 2 H L L H H L X ILLEGAL 2 H L L H L X X ILLEGAL 2 H L L L X X X ILLEGAL 2 L X X X X X X Refer to Current State =Power Down 2 H H X X X X X Refer to Function Truth Table H L X X X X X Begin CLK Suspend at Next Cycle 3 L H X X X X X Exit CLK Suspend at Next Cycle 3 L L X X X X X Maintain CLK Suspend ANY STATE other than listed above ABBREVIATIONS: H=High Level, L=Low Level, X=Don't Care NOTES: 1. CKE Low to High transition will re-enable CLK and other inputs asynchronously. A minimum setup time must be satisfied before any command other than EXIT. 2. Power-Down and Self-Refresh can be entered only from the All Banks Idle State. 3. Must be legal command. MITSUBISHI ELECTRIC 11 DDR SDRAM (Rev.1.0) MITSUBISHI LSIs M2S56D20/ 30/ 40AKT Jul. '01 Preliminary 256 M D o u b l e D a t a R a t e S y n c h r o n o u s D R A M SIMPLIFIED STATE DIAGRAM POWER APPLIED POWER PRE PREA SELF CHARGE ON REFRESH ALL REFS MRS REFSX MODE MRS REGISTER AUTO REFA IDLE REFRESH SET CKEL CKEH Active POWER ACT Power DOWN Down CKEL CKEH ROW BURST ACTIVE STOP WRITE READ READ WRITE WRITEA READA READ WRITE WRITEA READ TERM READA READA WRITEA READA PRE PRE PRE PRE CHARGE Automatic Sequence Command Sequence MITSUBISHI ELECTRIC 12 DDR SDRAM (Rev.1.0) MITSUBISHI LSIs M2S56D20/ 30/ 40AKT Jul. '01 Preliminary 256 M D o u b l e D a t a R a t e S y n c h r o n o u s D R A M POWER ON SEQUENCE Before starting normal operation, the following power on sequence is necessary to prevent a SDRAM from damaged or multifunctioning. 1. Apply VDD before or the same time as VDDQ 2. Apply VDDQ before or at the same time as VTT & Vref 3. Maintain stable condition for 200us after stable power and CLK, apply NOP or DSEL 4. Issue precharge command for all banks of the device 5. Issue EMRS 6. Issue MRS for the Mode Register and to reset the DLL 7. Issue 2 or more Auto Refresh commands 8. Maintain stable condition for 200 cycle After these sequence, the DDR SDRAM is idle state and ready for normal operation. MODE REGISTER CLK Burst Length, Burst Type and /CAS Latency can be programmed by setting the mode register (MRS). The mode register stores these data until the next MRS command, which may be issued when both banks are in idle state. After tMRD from a MRS command, the DDR SDRAM is ready for new command. /CLK BA1 BA0 A12 A11 A10 A 9 A8 A7 A6 A5 A4 A3 A2 /CS /RAS /CAS /WE A1 A0 BA0 BA1 0 0 0 0 0 Latency Mode 0 DR LTMODE 0 CL 0 0 0 /CAS Latency R 0 0 1 0 1 0 R 2 0 1 1 1 0 0 R R 1 0 1 R 1 1 0 1 1 1 2.5 R BT BL A11-A0 Burst Length Burst Type DLL Reset 0 NO 1 YES V BL 0 0 0 BT=0 R BT=1 R 0 0 1 0 1 0 2 4 2 4 0 1 1 1 0 0 8 R 8 R 1 0 1 R R 1 1 0 1 1 1 R R R R 0 Sequential 1 Interleaved R: Reserved for Future Use MITSUBISHI ELECTRIC 13 DDR SDRAM (Rev.1.0) MITSUBISHI LSIs M2S56D20/ 30/ 40AKT Jul. '01 Preliminary 256 M D o u b l e D a t a R a t e S y n c h r o n o u s D R A M EXTENDED MODE REGISTER DLL disable / enable mode can be programmed by setting the extended mode register (EMRS). The extended mode register stores these data until the next EMRS command, which may be issued when all banks are in idle state. After tMRD from a EMRS command, the DDR SDRAM is ready for new command. CLK /CLK /CS /RAS /CAS BA1 BA0 A12 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0 /WE BA0 0 1 0 0 0 0 0 0 0 0 0 0 0 DS DD BA1 V A11-A0 DLL Disable Drive Strength MITSUBISHI ELECTRIC 0 DLL Enable 1 DLL Disable 0 Normal 1 Weak 14 DDR SDRAM (Rev.1.0) MITSUBISHI LSIs M2S56D20/ 30/ 40AKT Jul. '01 Preliminary 256 M D o u b l e D a t a R a t e S y n c h r o n o u s D R A M /CLK CLK Command Read Write Y Y Address DQS Q0 Q1 Q2 Q3 DQ CL= 2 BL= 4 Initial Address /CAS Latency D0 D1 D2 D3 Burst Burst Length Length BL Column Addressing A2 A1 A0 Sequential Interleaved 0 0 0 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 0 1 1 2 3 4 5 6 7 0 1 0 3 2 5 4 7 6 0 1 0 2 3 4 5 6 7 0 1 2 3 0 1 6 7 4 5 0 1 1 3 4 5 6 7 0 1 2 3 2 1 0 7 6 5 4 8 1 0 0 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 1 0 1 5 6 7 0 1 2 3 4 5 4 7 6 1 0 3 2 1 1 0 6 7 0 1 2 3 4 5 6 7 4 5 2 3 0 1 1 1 1 7 0 1 2 3 4 5 6 7 6 5 4 3 2 1 0 - 0 0 0 1 2 3 0 1 2 3 - 0 1 1 2 3 0 1 0 3 2 4 - 1 0 2 3 0 1 2 3 0 1 - 1 1 3 0 1 2 3 2 1 0 - - 0 0 1 0 1 1 0 1 0 2 - - 1 MITSUBISHI ELECTRIC 15 DDR SDRAM (Rev.1.0) MITSUBISHI LSIs M2S56D20/ 30/ 40AKT Jul. '01 Preliminary 256 M D o u b l e D a t a R a t e S y n c h r o n o u s D R A M ABSOLUTE MAXIMUM RATINGS Symbol Parameter Conditions Ratings Unit Vdd Supply Voltage with respect to Vss -0.5 ~ 3.7 V VddQ Supply Voltage for Output with respect to VssQ -0.5 ~ 3.7 V VI Input Voltage with respect to Vss -0.5 ~ Vdd+0.5 V VO Output Voltage with respect to VssQ -0.5 ~ VddQ+0.5 V IO Output Current 50 mA Pd Power Dissipation 1000 mW Topr Operating Temperature 0 ~ 70 o Tstg Storage Temperature -65 ~ 150 o o Ta = 25 C C C DC OPERATING CONDITIONS (Ta=0 ~ 70 o C, unless otherwise noted) Symbol Parameter Vdd Limits Unit Notes Min. Typ. Max. Supply Voltage 2.3 2.5 2.7 V VddQ Supply Voltage for Output 2.3 2.5 2.7 V Vref Input Reference Voltage 0.49*VddQ 0.50*VddQ 0.51*VddQ V VIH(DC) High-Level Input Voltage Vref + 0.15 VddQ+0.3 V VIL(DC) Low-Level Input Voltage -0.3 Vref - 0.15 V VIN(DC) Input Voltage Level, CLK and /CLK -0.3 VddQ + 0.3 V 0.36 VddQ + 0.6 V 7 Vref - 0.04 Vref + 0.04 V 6 VID(DC) Input Differential Voltage, CLK and /CLK VTT I/O Termination Voltage 5 CAPACITANCE (Ta=0 ~ 70 o C, Vdd = VddQ = 2.5V + 0.2V, Vss = VssQ = 0V, unless otherwise noted) Test Condition Limits Delta Unit Min. Max. Cap.(Max.) Symbol Parameter CI(A) Input Capacitance, address pin VI=1.25v 2.0 3.0 CI(C) Input Capacitance, control pin f=100MHz 2.0 3.0 CI(K) Input Capacitance, CLK pin VI=25mVrms 2.0 3.0 CI/O I/O Capacitance, I/O, DQS, DM pin 4.0 5.0 MITSUBISHI ELECTRIC Notes pF 11 pF 11 0.25 pF 11 0.50 pF 11 0.50 16 DDR SDRAM (Rev.1.0) MITSUBISHI LSIs M2S56D20/ 30/ 40AKT Jul. '01 Preliminary 256 M D o u b l e D a t a R a t e S y n c h r o n o u s D R A M AVERAGE SUPPLY CURRENT from Vdd (Ta=0 ~ 70 o C, Vdd = VddQ = 2.5V + 0.2V, Vss = VssQ = 0V, Output Open, unless otherwise noted) Symbol IDD0 Parameter/Test Conditions Organization OPERATING CURRENT: One Bank; Active-Precharge; t RC = t RC MIN; t CK = t CK MIN; DQ, DM and DQS inputs changing twice per clock cycle; address -75 -10 x4 105 105 100 x8 110 110 105 x16 120 120 115 x4 110 110 105 x8 115 115 110 x16 135 135 130 x4/x8/x16 20 20 20 x4/x8/x16 40 40 40 x4/x8/x16 30 30 30 and control inputs changing once per clock cycle OPERATING CURRENT: One Bank; Active-Read-Precharge; IDD1 Burst = 2; t RC = t RC MIN; CL = 2.5; t CK = t CK MIN; IOUT= 0mA; Address and control inputs changing once per clock cycle IDD2P PRECHARGE POWER-DOWN STANDBY CURRENT: All banks idle; powerdown mode; CKE <VIL (MAX); t CK = t CK MIN IDLE STANDBY CURRENT: /CS > VIH (MIN); All banks idle; IDD2F CKE > VIH (MIN); t CK = t CK MIN; Address and other control inputs changing Limits(Max.) -75A Unit Notes once per clock cycle IDD3P ACTIVE POWER-DOWN STANDBY CURRENT: One bank active; powerdown mode; CKE < VIL (MAX); t CK = t CK MIN ACTIVE STANDBY CURRENT: /CS > VIH (MIN); CKE > VIH (MIN); One IDD3N 60 60 55 x4/x8/x16 65 65 60 75 75 70 x4 150 150 140 mA bank; Active-Precharge; t RC = t RAS MAX; t CK = t CK MIN; DQ,DM and DQS inputs changing twice per clock cycle; address and other control inputs changing once per clock cycle OPERATING CURRENT: Burst = 2; Reads; Continuous burst;One bank active; IDD4R Address and control inputs changing once per clock cycle;CL=2.5; t CK = t CK MIN; IOUT = 0 mA OPERATING CURRENT: Burst = 2; Writes; Continuous burst; One bank active; IDD4W Address and control inputs changing once per clock cycle; CL=2.5; t CK = t CK MIN;DQ, DM and DQS inputs changing twice per clock cycle x8 170 170 160 x16 210 210 200 x4 145 145 135 x8 165 165 155 x16 200 200 180 IDD5 AUTO REFRESH CURRENT: t RC = t RFC (MIN) x4/x8/x16 185 185 175 IDD6 SELF REFRESH CURRENT: CKE < 0.2V x4/x8/x16 3 3 3 IDD7 OPERATING CURRENT-Four bank Operation: Four bank interleaving with BL=4 -Refer to the Notes 20 x4 250 250 230 20 x8 260 260 240 20 x16 290 290 280 20 AC OPERATING CONDITIONS AND CHARACTERISTICS (Ta=0 ~ 70 o C, Vdd = VddQ = 2.5V + 0.2V, Vss = VssQ = 0V, Output Open, unless otherwise noted) Symbol Parameter / Test Conditions VIH(AC) High-Level Input Voltage (AC) Limits Min. Vref + 0.31 VIL(AC) Low-Level Input Voltage (AC) VID(AC) Input Differential Voltage, CLK and /CLK VIX(AC) Input Crossing Point Voltage, CLK and /CLK IOZ II Max. 0.7 Unit V Vref - 0.31 V VddQ + 0.6 V 7 V 8 0.5*VddQ - 0.2 0.5*VddQ + 0.2 Off-state Output Current /Q floating Vo=0~VddQ -5 5 µ A Input Current / VIN=0 ~ VddQ -2 2 µ A IOH Output High Current (VOUT = VTT+0.84V) -16.8 mA IOL Output High Current (VOUT = VTT-0.84V) 16.8 mA MITSUBISHI ELECTRIC Notes 17 DDR SDRAM (Rev.1.0) MITSUBISHI LSIs M2S56D20/ 30/ 40AKT Jul. '01 Preliminary 256 M D o u b l e D a t a R a t e S y n c h r o n o u s D R A M AC TIMING REQUIREMENTS (Ta=0 ~ 70 o C, Vdd = VddQ = 2.5V +0.2V, Vss = VssQ = 0V, unless otherwise noted) Symbol -75A AC Characteristics Parameter -75 -10 Min. Max Min. Max Min. Max DQ Output Valid data delay time from CLK//CLK -0.75 0.75 -0.75 0.75 -0.8 0.8 tDQSCK DQ Output Valid data delay time from CLK//CLK tAC Unit ns -0.75 0.75 -0.75 0.75 -0.8 0.8 ns tCH CLK High level width 0.45 0.55 0.45 0.55 0.45 0.55 tCK tCL CLK Low level width 0.45 0.55 0.45 0.55 0.45 0.55 tCK CL=2.5 7.5 15 7.5 15 8 15 ns tCK CLK cycle time CL=2 7.5 15 10 15 10 15 ns tDS tDH Input Setup time (DQ,DM) 0.5 Notes 0.5 0.6 ns Input Hold time(DQ,DM) 0.5 0.5 0.6 ns DQ and DM input pulse width (for each input) 1.75 1.75 2 ns tHZ Data-out-high impedance time from CLK//CLK -0.75 0.75 -0.75 0.75 -0.8 0.8 ns 14 tLZ Data-out-low impedance time from CLK//CLK -0.75 0.75 -0.75 0.75 -0.8 0.8 ns 14 0.6 ns tDIPW tDQSQ DQ Valid data delay time from DQS 0.5 tHP Clock half period tCLmin or tCHmin tQH Output DQS valid window tHP-0.75 tDQSS Write command to first DQS latching transition 0.75 0.5 tCLmin or tCHmin tCLmin or tCHmin tHP-0.75 1.25 0.75 ns tHP-1.0 1.25 0.75 ns 1.25 tCK tDQSH DQS input High level width 0.35 0.35 0.35 tCK tDQSL DQS input Low level width 0.35 0.35 0.35 tCK tDSS DQS falling edge to CLK setup time 0.2 0.2 0.2 tCK tDSH DQS falling edge hold time from CLK 0.2 0.2 0.2 tCK tMRD Mode Register Set command cycle time 15 15 15 ns 0 0 0 ns 16 tCK 15 tWPRES Write preamble setup time tWPST Write postamble 0.4 tWPRE Write preamble 0.25 0.6 0.25 0.25 tCK tIS Input Setup time (address and control) 0.9 0.9 1.1 ns 19 tIH Input Hold time (address and control) 0.9 0.9 1.1 ns 19 tRPST Read postamble 0.4 0.6 0.4 0.6 0.4 0.6 tCK tRPRE Read preamble 0.9 1.1 0.9 1.1 0.9 1.1 tCK MITSUBISHI ELECTRIC 0.4 0.6 0.4 0.6 18 DDR SDRAM (Rev.1.0) MITSUBISHI LSIs M2S56D20/ 30/ 40AKT Jul. '01 Preliminary 256 M D o u b l e D a t a R a t e S y n c h r o n o u s D R A M AC TIMING REQUIREMENTS(Continues) (Ta=0 ~ 70 o C, Vdd = VddQ = 2.5V +0.2V, Vss = VssQ = 0V, unless otherwise noted) Symbol -75A AC Characteristics Parameter -75 -10 Min. Max Min. Max Min. Max 120,000 45 120,000 50 120,000 Unit tRAS Row Active time 45 tRC Row Cycle time(operation) 65 65 70 ns tRFC Auto Ref. to Active/Auto Ref. command period 75 75 80 ns tRCD ns Row to Column Delay 20 20 20 ns tRP Row Precharge time 20 20 20 ns tRRD Act to Act Delay time 15 15 15 ns tWR Write Recovery time 15 15 15 ns tDAL Auto Precharge write recovery + precharge time 35 35 35 ns tWTR Internal Write to Read Command Delay 1 1 1 tCK tXSNR Exit Self Ref. to non-Read command 75 75 80 ns tXSRD Exit Self Ref. to -Read command 200 200 200 tCK tXPNR Exit Power down to command 1 1 1 tCK tXPRD Exit Power down to -Read command tREFI Average Periodic Refresh interval Notes 1 1 1 tCK 18 7.8 7.8 7.8 µs 17 Output Load Condition V REF DQS DQ V TT = V REF 50 Ω VOUT V REF Zo=50 Ω 30pF V REF Output Timing Measurement Reference Point MITSUBISHI ELECTRIC 19 DDR SDRAM (Rev.1.0) Jul. '01 Preliminary MITSUBISHI LSIs M2S56D20/ 30/ 40AKT 256 M D o u b l e D a t a R a t e S y n c h r o n o u s D R A M Notes 1. All voltages referenced to Vss. 2. Tests for AC timing, IDD, and electrical, AC and DC characteristics, may be conducted at nominal reference/supply voltage levels, but the related specifications and device operation are guaranteed for the full voltage range specified. 3. AC timing and IDD tests may use a VIL to VIH swing of up to 1.5V in the test environment, but input timing is still referenced to VREF (or to the crossing point for CK//CK), and parameter specifications are guaranteed for the specified AC input levels under normal use conditions. The minimum slew rate for the input signals is 1V/ns in the range between VIL(AC) and VIH(AC). 4. The AC and DC input level specifications are as defined in th e SSTL_2 Standard (i.e. the receiver will effectively switch as a result of the signal crossing the AC input level, and will remain in that state as long as the signal does not ring back above (below) the DC input LOW (HIGH) level. 5. VREF is expected to be equal to 0.5*VddQ of the transmitting device, and to track variations in the DC level of the same. Peak-to-peak noise on VREF may not exceed +2% of the DC value. 6. VTT is not applied directly to the device. VTT is a system su pply for signal termination resistors, is expected to be set equal to VREF, and must track variations in the DC level of VREF. 7. VID is the magnitude of the difference between the input level on CLK and the input level on /CLK. 8. The value of VIX is expected to equal 0.5*VddQ of the transmitting device and must track variations in the DC level of the same. 9. Enables on-chip refresh and address counters. 10. IDD specifications are tested after the device is properly initialized. 11. This parameter is sampled. VddQ = 2.5V+0.2V, Vdd = 2.5V + 0.2V , f = 100 MHz, Ta = 25 o C, VOUT(DC) = VddQ/2, VOUT(PEAK TO PEAK) = 25mV. DM inputs are grouped with I/O pins - reflecting the fact that they are matched in loading (to facilitate trace matching at the board level). 12. The CLK//CLK input reference level (for timing referenced to CLK//CLK) is the point at which CLK and /CLK cross; the input reference level for signals other than CLK//CLK, is VREF. 13. Inputs are not recognized as valid until VREF stabilizes. Exception: during the period before VREF stabilizes, CKE< 0.3VddQ is recognized as LOW. 14. t HZ and tLZ transitions occur in the same access time windows as valid data transitions. These parameters are not referenced to a specific voltage level, but specify when the device output is no longer driving (HZ), or begins driving (LZ). 15. The maximum limit for this parameter is not a device limit. The device will operate with a greater value for this parameter, but system performance (bus turnaround) will degrade accordingly. 16. The specific requirement is that DQS be valid (HIGH, LOW, or at some point on a valid transition) on or before this CLK edge. A valid transition is defined as monotonic, and meeting the input slew rate specifications of the device. When no writes were previously in progress on the bus, DQS will be transitioning from High-Z to logic LOW. If a previous write was in progress, DQS could be HIGH, LOW, or transitioning from HIGH to LOW at this time, depending on tDQSS. 17. A maximum of eight AUTO REFRESH commands can be posted to any given DDR SDRAM device. 18. tXPRD should be 200 tCLK in the condition of the unstable CLK operation during the power down mode. 19. For command/address and CK & /CK slew rate > 1.0V/ns. 20. IDD7 : Operating current:Four Bank For Bank are being interleaved with tRC(min),Burst Mode,Address and Control inputs on NOP edge are not changing.Iout = 0mA Timing patterns: tCK=min,tRRD=2*tCK,BL=4,tRCD=3*tCK,Read with Autoprecharge Read:A0 N A1 R0 A2 R1 N R3 A0 N A1 R0 – repeat the same timing with random address changing *100% of data changing at every burst Legend: A=Activate,R=Read,P=Precharge,N=NOP MITSUBISHI ELECTRIC 20 DDR SDRAM (Rev.1.0) MITSUBISHI LSIs M2S56D20/ 30/ 40AKT Jul. '01 Preliminary 256 M D o u b l e D a t a R a t e S y n c h r o n o u s D R A M Read Operation tCK tCH tCL /CLK CLK tIS tIH Cmd & Valid Data Add. VREF tDQSCK tRPST tRPRE DQS tQH tDQSQ DQ tAC Write Operation / tDQSS=max. /CLK CLK tDQSS DQS tWPST tDSS tWPRES tDQSL tWPRE tDQSH tDS tDH DQ Write Operation / tDQSS=min. /CLK CLK tDSH tDQSS tWPST DQS tWPRES tWPRE tDQSL tDS tDQSH tDH DQ MITSUBISHI ELECTRIC 21 DDR SDRAM (Rev.1.0) MITSUBISHI LSIs M2S56D20/ 30/ 40AKT Jul. '01 Preliminary 256 M D o u b l e D a t a R a t e S y n c h r o n o u s D R A M OPERATIONAL DESCRIPTION BANK ACTIVATE The DDR SDRAM has four independent banks. Each bank is activate d by the ACT command with the bank addresses (BA0,1). A row is indicated by the row address A12-0. The minimum activation interval between one bank and the other bank is tRRD. PRECHARGE The PRE command deactivates the bank indicated by BA0,1. When multiple banks are active, the precharge all command (PREA,PRE+A10=H) is available to deactivate them at the same time. After tRP from the precharge, an ACT command to the same bank can be issued. Bank Activation and Precharge All (BL=8, CL=2) /CLK CLK 2 ACT command / tRCmin tRCmin Command ACT ACT READ tRRD A0-9,11 Xa PRE tRP tRAS Xb ACT Y tRCD Xb BL/2 A10 Xa Xb 0 BA0,1 00 01 00 1 Xb 01 DQS DQ Qa0 Qa1 Qa2 Qa3 Qa4 Qa5 Qa6 Qa7 Precharge all A precharge command can be issued at BL/2 from a read command without data loss. MITSUBISHI ELECTRIC 22 DDR SDRAM (Rev.1.0) MITSUBISHI LSIs M2S56D20/ 30/ 40AKT Jul. '01 Preliminary 256 M D o u b l e D a t a R a t e S y n c h r o n o u s D R A M READ After tRCD from the bank activation, a READ command can be issued. 1st Output data is available after the /CAS Latency from the READ, followed by (BL-1) consecutive data when the Burst Length is BL. The start address is specified by A11,A9-A0(x4)/A9 -A0(x8)/A8-A0(x16), and the address sequence of burst data is defined by the Burst Type. A READ command may be applied to any active bank, so the row precharge time (tRP) can be hidden behind continuous output data by interleaving the multiple banks. When A10 is high at a READ command, the auto-precharge (READA) is performed. Any command(READ,WRITE,PRE,ACT) to the same bank is inhibited till the internal precharge is complete. The internal precharge starts at BL/2 after READA. The next ACT command can be issued after (BL/2+tRP) from the previous REA DA. Multi Bank Interleaving READ (BL=8, CL=2) /CLK CLK Command ACT R E A D ACT READ PRE tRCD A0-9,11 Xa Y Xb Y A10 Xa 0 Xb 0 BA0,1 00 00 10 10 0 00 DQS DQ Qa0 Qa1 Qa2 Qa3 Qa4 Qa5 Qa6 Qa7 Qb0 Qb1 Qb2 Qb3 Qb4 Qb5 Qb7 Qb8 Burst Length /CAS latency MITSUBISHI ELECTRIC 23 DDR SDRAM (Rev.1.0) MITSUBISHI LSIs M2S56D20/ 30/ 40AKT Jul. '01 Preliminary 256 M D o u b l e D a t a R a t e S y n c h r o n o u s D R A M READ with Auto-Precharge (BL=8, CL=2,2.5) 0 1 2 3 4 5 6 7 8 9 10 11 12 /CLK CLK BL/2 + tRP Command ACT READA tRCD BL/2 A0-9,11 Xa Y A10 Xa 1 BA0,1 00 00 tRP DQS CL=2 DQ Qa0 Qa1 Qa2 Qa3 Qa4 Qa0 Qa1 Qa2 Qa5 Qa6 Qa7 Qa4 Qa5 Qa6 DQS CL=2.5 DQ Qa3 Qa7 Internal Precharge Start Timing Asserted Command For Different Bank 3 4 5 6 7 8 9 10 READ Legal Legal Legal Legal Legal Legal Legal Legal READA Legal Legal Legal Legal Legal Legal Legal Legal WRITE(CL=2) Illegal Illegal Illegal Illegal Illegal Legal Legal Legal WRITE(CL=2.5) Illegal Illegal Illegal Illegal Illegal Illegal Legal Legal WRITEA(CL=2) Illegal Illegal Illegal Illegal Illegal Legal Legal Legal WRITEA(CL=2.5) Illegal Illegal Illegal Illegal Illegal Illegal Legal Legal ACT Legal Legal Legal Legal Legal Legal Legal Legal PCG Legal Legal Legal Legal Legal Legal Legal Legal Operating description when new command asserted. MITSUBISHI ELECTRIC 24 DDR SDRAM (Rev.1.0) MITSUBISHI LSIs M2S56D20/ 30/ 40AKT Jul. '01 Preliminary 256 M D o u b l e D a t a R a t e S y n c h r o n o u s D R A M WRITE After tRCD from the bank activation, a WRITE command can be issued. 1st input data is set from the WRITE command with data strobe input, following (BL-1) data are written into RAM, when the Burst Length is BL. The start address is specified by A11,A9-A0(x4)/A9-A0(x8)/A8-A0(x16), and the address sequence of burst data is defined by the Burst Type. A WRITE command may be applied to any active bank, so the row precharge time (tRP) can be hidden behind continuous input data by interleaving the multiple banks. From the last data to the PRE command, the write recovery time (tWRP) is required. When A10 is high at a WRITE command, the auto-precharge(WRITEA) is performed. Any command(READ,WRITE,PRE,ACT) to the same bank is inhibited till the internal precharge is complete. The next ACT command can be issued after tDAL from the last input data cycle. Multi Bank Interleaving WRITE (BL=8) /CLK CLK Command ACT A0-9,11 Xa A10 BA0,1 WRITE WRITE ACT PRE tRCD tRCD D PRE D Ya Xb Yb Xa Xa 0 Xb 0 0 0 00 00 10 10 00 10 DQS DQ Da0 Da1 Da2 Da3 Da4 Da5 Da6 Da7 Db0 MITSUBISHI ELECTRIC Db1 Db2 Db3 Db4 Db5 Db6 Db7 25 DDR SDRAM (Rev.1.0) MITSUBISHI LSIs M2S56D20/ 30/ 40AKT Jul. '01 Preliminary 256 M D o u b l e D a t a R a t e S y n c h r o n o u s D R A M WRITE with Auto -Precharge (BL=8) 0 1 2 3 4 5 6 7 8 9 10 11 12 /CLK CLK Command ACT WRITEA ACT tDAL tRC A0-9,11 Xa Y Xb A10 Xa 1 Xb BA0,1 00 00 00 D DQS DQ Da0 Da1 Da2 Da3 Asserted Da4 Da5 Da6 Da7 For Different Bank Command 3 4 5 6 7 8 9 10 READ Illegal Illegal Illegal Illegal Illegal Legal Legal Legal READA Illegal Illegal Illegal Illegal Illegal Legal Legal Legal WRITE Legal Legal Legal Legal Legal Legal Legal Legal WRITEA Legal Legal Legal Legal Legal Legal Legal Legal ACT Legal Legal Legal Legal Legal Legal Legal Legal PCG Legal Legal Legal Legal Legal Legal Legal Legal Operating description when new command asserted. MITSUBISHI ELECTRIC 26 DDR SDRAM (Rev.1.0) MITSUBISHI LSIs M2S56D20/ 30/ 40AKT Jul. '01 Preliminary 256 M D o u b l e D a t a R a t e S y n c h r o n o u s D R A M BURST INTERRUPTION [Read Interrupted by Read] Burst read operation can be interrupted by new read of any bank. Random column access is allowed. READ to READ interval is minimum 1CLK. Read Interrupted by Read (BL=8, CL=2) /CLK CLK Command A0-9,11 READ READ READ READ Yi Yj Yk Yl A10 0 0 0 0 BA0,1 00 00 10 01 DQS DQ Qai0 Qai1 Qaj0 Qaj1 Qaj2 Qaj3 Qak0 Qak1 Qak2 Qak3 Qak4 Qak5 Qal0 Qal1 Qal2 Qal3 Qal4 Qal5 Qal6 Qal7 [Read Interrupted by precharge] Burst read operation can be interrupted by precharge of the same bank. READ to PRE interval is minimum 1 CLK. A PRE command to output disable latency is equivalent to the /CAS Latency. As a result, READ to PRE interval determines valid data length to be output. The figure below shows examples of BL=8. Read Interrupted by Precharge (BL=8) /CLK CLK Command READ PRE DQS DQ Command CL=2.5 READ Q0 Q1 Q2 Q3 Q0 Q1 Q2 Q3 Q0 Q1 Q4 Q5 PRE DQS DQ Command READ PRE DQS DQ MITSUBISHI ELECTRIC 27 DDR SDRAM (Rev.1.0) MITSUBISHI LSIs M2S56D20/ 30/ 40AKT Jul. '01 Preliminary 256 M D o u b l e D a t a R a t e S y n c h r o n o u s D R A M Read Interrupted by Precharge (BL=8) /CLK CLK Command READ PRE DQS DQ Command CL=2.0 Q0 Q1 Q2 Q3 Q0 Q1 Q2 Q3 Q0 Q1 Q4 Q5 PRE READ DQS DQ Command READ PRE DQS DQ MITSUBISHI ELECTRIC 28 DDR SDRAM (Rev.1.0) MITSUBISHI LSIs M2S56D20/ 30/ 40AKT Jul. '01 Preliminary 256 M D o u b l e D a t a R a t e S y n c h r o n o u s D R A M [Read Interrupted by Burst Stop] Burst read operation can be interrupted by a burst stop command( TERM). READ to TERM interval is minimum 1 CLK. A TERM command to output disable latency is equivalent to the /CAS Latency. As a result, READ to TERM interval determines valid data length to be output. The figure below shows examples of BL=8. Read Interrupted by TERM (BL=8) /CLK CLK Command TERM READ DQS DQ Command CL=2.5 READ Q0 Q1 Q2 Q3 Q0 Q1 Q2 Q3 Q4 Q4 Q5 TERM DQS DQ Command R E A D TERM DQS DQ Command Q0 READ Q1 TERM DQS Q0 DQ Command CL=2.0 READ Q1 Q2 Q3 Q0 Q1 Q2 Q3 Q0 Q1 Q5 TERM DQS DQ Command R E A D TERM DQS DQ MITSUBISHI ELECTRIC 29 DDR SDRAM (Rev.1.0) MITSUBISHI LSIs M2S56D20/ 30/ 40AKT Jul. '01 Preliminary 256 M D o u b l e D a t a R a t e S y n c h r o n o u s D R A M [Read Interrupted by Write with TERM] Read Interrupted by TERM (BL=8) /CLK CLK Command CL=2.5 READ TERM DQS Q0 DQ Command CL=2.0 WRITE READ Q1 TERM Q2 Q3 D0 D1 D2 D3 D4 D5 D5 D6 D7 WRITE DQS DQ Q0 Q1 Q2 Q3 MITSUBISHI ELECTRIC D0 D1 D2 D3 D4 30 DDR SDRAM (Rev.1.0) MITSUBISHI LSIs M2S56D20/ 30/ 40AKT Jul. '01 Preliminary 256 M D o u b l e D a t a R a t e S y n c h r o n o u s D R A M [Write interrupted by Write] Burst write operation can be interrupted by write of any bank. Random column access is allowed. WRITE to WRITE interval is minimum 1 CLK. Write Interrupted by Write (BL=8) /CLK CLK Command WRITE WRITE WRITE WRITE A0-9,11 Yi Yj Yk Yl A10 0 0 0 0 BA0,1 00 00 10 00 DQS DQ Dai0 Dai1 Daj0 Daj1 Daj2 Daj3 Dak0 Dak1 Dak2 Dak3 Dak4 Dak5 Dal0 Dal1 Dal2 Dal3 Dal4 Dal5 Dal6 Dal7 [Write interrupted by Read] Burst write operation can be interrupted by read of the same or the other bank. Random column access is allowed. Internal WRITE to READ command interval(tWTR) is minimum 1 CLK. The input data on DQ at the interrupting READ cycle is "don't care". tWTR is referenced from the first positive edge after the last data input. Write Interrupted by Read (BL=8, CL=2.5) /CLK CLK Command A0-9,11 A10 BA0,1 WRITE READ Yi Yj 0 0 00 00 DM tWTR QS DQ Dai0 Dai1 Qaj0 Qaj1 Qaj2 MITSUBISHI ELECTRIC Qaj3 Qaj4 Qaj5 Qaj6 Qaj7 31 DDR SDRAM (Rev.1.0) MITSUBISHI LSIs M2S56D20/ 30/ 40AKT Jul. '01 Preliminary 256 M D o u b l e D a t a R a t e S y n c h r o n o u s D R A M [Write interrupted by Precharge] Burst write operation can be interrupted by precharge of the same or all bank. Random column access is allowed. tWR is referenced from the first positive CLK edge after the last data input. Write Interrupted by Precharge (BL=8, CL=2.5) /CLK CLK Command A0-9,11 A10 BA0,1 WRITE PRE Yi 0 00 00 tWR DM QS DQ Dai0 Dai1 MITSUBISHI ELECTRIC 32 DDR SDRAM (Rev.1.0) MITSUBISHI LSIs M2S56D20/ 30/ 40AKT Jul. '01 Preliminary 256 M D o u b l e D a t a R a t e S y n c h r o n o u s D R A M [Initialize and Mode Register sets] Initialize and MRS /CLK CLK CKE Command NOP PRE A0-9,11 A10 1 BA0,1 EMRS MRS Code Code Code Code 10 0 0 PRE AR AR MRS ACT Xa 1 Code Xa 0 0 Xa DQS DQ tMRD tMRD tRP Extended Mode Mode Register Set, Register Set Reset DLL tRFC tRFC tMRD [AUTO REFRESH] Single cycle of auto-refresh is initiated with a REFA(/CS=/RAS=/CAS=L,/WE=CKE=H) command. The refresh address is generated internally. 8192 REFA cycles within 64ms refresh 256Mbits memory cells. The auto-refresh is performed on 4 banks concurrently. Before performing an auto refresh, all banks must be in the idle state. Auto-refresh to auto-refresh interval is minimum tRFC . Any command must not be supplied to the device before tRFC from the REFA command. Auto-Refresh /CLK CLK /CS NOP or DESELECT /RAS /CAS /WE CKE tRFC A0-11 BA0,1 Auto Refresh on All Banks Auto Refresh on All Banks MITSUBISHI ELECTRIC 33 DDR SDRAM (Rev.1.0) Jul. '01 Preliminary MITSUBISHI LSIs M2S56D20/ 30/ 40AKT 256 M D o u b l e D a t a R a t e S y n c h r o n o u s D R A M [SELF REFRESH] Self -refresh mode is entered by issuing a REFS command (/CS=/RAS=/CAS=L,/WE=H,CKE=L). Once the self-refresh is initiated, it is maintained as long as CKE is kept low. During the selfrefresh mode, CKE is asynchronous and the only enable input, all other inputs including CLK are disabled and ignored, so that power consumption due to synchronous inputs is saved. To exit the self-refresh, supplying stable CLK inputs, asserting DESEL or NOP command and then asserting CKE for longer than tXSNR/tXSRD. Self-Refresh /CLK CLK /CS /RAS /CAS /WE CKE A0-11 X Y BA0,1 X Y tXSNR tXSRD Self Refresh Exit MITSUBISHI ELECTRIC 34 DDR SDRAM (Rev.1.0) MITSUBISHI LSIs M2S56D20/ 30/ 40AKT Jul. '01 Preliminary 256 M D o u b l e D a t a R a t e S y n c h r o n o u s D R A M [Power DOWN] The purpose of CLK suspend is power down. CKE is synchronous inp ut except during the selfrefresh mode. A command at cycle is ignored. From CKE=H to normal function, DLL recovery time is NOT required in the condition of the stable CLK operation during the power down mode. Power Down by CKE /CLK CLK Standby Power Down CKE Command PRE NOP NOP Valid tXPNR/tXPRD Active Power Down CKE Command ACT NOP NOP Valid [DM CONTROL] DM is defined as the data mask for writes. During writes,DM masks input data word by word. DM to write mask latency is 0. DM Function(BL=8,CL=2) /CLK CLK Command READ WRITE DM Don't Care DQS DQ D0 D1 D3 D4 D5 D6 D7 Q0 Q1 Q2 Q3 Q4 Q5 Q6 masked by DM=H MITSUBISHI ELECTRIC 35 DDR SDRAM (Rev.1.0) Jul. '01 Preliminary MITSUBISHI LSIs M2S56D20/ 30/ 40AKT 256 M D o u b l e D a t a R a t e S y n c h r o n o u s D R A M Keep safety first in your circuit designs! Mitsubishi Electric Corporation puts the maximum effort into making semiconductor products better and more reliable, but there is always the possibility that trouble may occur with them. Trouble with semiconductors may lead to personal injury, fire or property damage. Remember to give due consideration to safety when making your circuit designs, with appropriate measures such as (i) placement of substitutive, auxiliary circuits, (ii) use of non-flammable material or (iii) prevention against any malfunction or mishap. Notes regarding these materials These materials are intended as a reference to assist our customers in the selection of the Mitsubishi semiconductor product best suited to the customer’s application; they do not convey any license under any intellectual property rights, or any other rights, belonging to Mitsubishi Electric Corporation or a third party. Mitsubishi Electric Corporation assumes no responsibility for any damage, or infringement of any third-party’s rights, originating in the use of any product data, diagrams, charts, programs, algorithms, or circuit application examples contained in these materials. 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The prior written approval of Mitsubishi Electric Corporation is necessary to reprint or reproduce in whole or in part these materials. If these products or technologies are subject to the Japanese export control restrictions, they must be exported under a license from the Japanese government and cannot be imported into a country other than the approved destination. Any diversion or reexport contrary to the export control laws and regulations of Japan and/or the country of destination is prohibited. Please contact Mitsubishi Electric Corporation or an authorized Mitsubishi Semiconductor product distributor for further details on these materials or the products contained therein. MITSUBISHI ELECTRIC 36 DDR SDRAM (Rev.1.0) Jul. '01 Preliminary MITSUBISHI LSIs M2S56D20/ 30/ 40AKT 256 M D o u b l e D a t a R a t e S y n c h r o n o u s D R A M Revision History Rev. Date 1.0 Jul. ’01 Description -New registration (Jul. ‘01) MITSUBISHI ELECTRIC 37