Electronic Components Datasheet Search |
|
W3E32M72SR-266SBI Datasheet(PDF) 8 Page - White Electronic Designs Corporation |
|
W3E32M72SR-266SBI Datasheet(HTML) 8 Page - White Electronic Designs Corporation |
8 / 19 page W3E32M72SR-XSBX 8 White Electronic Designs Corporation • (602) 437-1520 • www.wedc.com White Electronic Designs July 2006 Rev. 3 White Electronic Designs Corp. reserves the right to change products or specifications without notice. COMMAND READ NOP NOP NOP CL = 2.5 DON'T CARE TRANSITIONING DATA DQ DQS T0 T1 T2 T2n T3 T3n COMMAND READ NOP NOP NOP CL = 2 DQ DQS CLK CLK# T0 T1 T2 T2n T3 T3n Burst Length = 4 in the cases shown Shown with nominal tAC and nominal tDSDQ DATA CLK CLK# FIG. 4 CAS LATENCY FIG. 5 EXTENDED MODE REGISTER DEFINITION DLL Enable Disable A9 A7 A6 A5 A4 A3 A8 A2 A1 A0 Extended Mode Register (Ex) Address Bus Operating Mode A10 A11 11 01 BA0 BA1 E0 0 1 Drive Strength Normal Reduced E1 0 1 Operating Mode Reserved Reserved E1, E0 Valid - E12 0 - E10 0 - E9 0 - E8 0 - E7 0 - E6 0 - E5 0 - E4 0 - E3 0 - A12 E11 0 - 1. E14 and E13 must be "0, 1" to select the Extended Mode Register (vs. the base Mode Register) 2. The QFC# function is not supported. E2 0 - 14 13 12 11 10 9 8 76543210 DLL DS must be activated prior to any READ or WRITE commands being issued to that bank. A PRECHARGE command will be treated as a NOP if there is no open row in that bank (idle state), or if the previously open row is already in the process of precharging. AUTO PRECHARGE AUTO PRECHARGE is a feature which performs the same individual-bank PRECHARGE function described above, but without requiring an explicit command. This is accomplished by using A10 to enable AUTO PRECHARGE in conjunction with a specific READ or WRITE command. A precharge of the bank/row that is addressed with the READ or WRITE command is automatically performed upon completion of the READ or WRITE burst. AUTO PRECHARGE is nonpersistent in that it is either enabled or disabled for each individual READ or WRITE command. The device supports concurrent auto precharge if the command to the other bank does not interrupt the data transfer to the current bank. AUTO PRECHARGE ensures that the precharge is initiated at the earliest valid stage within a burst. This “earliest valid stage” is determined as if an explicit precharge command was issued at the earliest possible time, without violating tRAS (MIN).The user must not issue another command to the same bank until the precharge time (tRP) is completed. BURST TERMINATE The BURST TERMINATE command is used to truncate READ bursts (with auto precharge disabled). The most recently registered READ command prior to the BURST TERMINATE command will be truncated. The open page which the READ burst was terminated from remains open. AUTO REFRESH AUTO REFRESH is used during normal operation of the DDR SDRAM and is analogous to CAS-BEFORE-RAS (CBR) REFRESH in conventional DRAMs. This command is nonpersistent, so it must be issued each time a refresh is required. All banks must be idle before an AUTO REFRESH command is issued. The addressing is generated by the internal refresh controller. This makes the address bits “Don’t Care” during |
Similar Part No. - W3E32M72SR-266SBI |
|
Similar Description - W3E32M72SR-266SBI |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |