參數(shù)資料
型號(hào)： W987Z6CBN
英文描述： DRAM
中文描述： 內(nèi)存
文件頁(yè)數(shù)： 11/47頁(yè)
文件大?。?/td> 1227K
代理商： W987Z6CBN
W987Z6CBN/BG
Publication Release Date: March 2002
- 11 -
Revision P11
(RAS =”H”, CAS =”L”, WE =”H”, BS0, BS1=Bank, A10=”L”, A0 to A8=Column Address)
The Read command performs a Read operation to the bank designated by BS. The length of read
data (Burst Length), Addressing Mode and CAS Latency (access time from CAS command in a
clock cycle) must be programmed in the Mode Register at power-up prior to the Read operation.
2-7 Read with Auto Precharge command
(RAS =”H”, CAS =”L”, WE =”H”, BS0, BS1=Bank, A10=”H”, A0 to A8=Column Address)
The Read with Auto precharge command automatically performs the Precharge operation after
the Read operation. This command must not be interrupted by any other command.
2-8 Mode Register Set command
(RAS =”L”, CAS =”L”, WE =”L”, BS0=”L”, BS1=”L”, A0 to A11=Register Data)
The Mode Register Set command programs the values of Burst Length, Addressing Mode, CAS
latency and Write Mode in the Mode Register. The default values in the Mode Register after
power-up are undefined, therefore this command must be issued during the power-up sequence.
Also, this command can be issued while all banks are in the idle state. Refer to the table for
specific codes.
2-9 Extended Mode Register Set command
(RAS =”L”, CAS =”L”, WE =”L”, BS0=”L”, BS1=”H”, A0 to A11=Register data)
The Extended Mode Register Set command programs the values of Driver Strength, Temperature
Compensated Self Refresh and Partial Array Self Refresh. The default value of the extended
mode register is Full Driver Strength, 70 degrees C and All banks Refreshed
2-10 No-Operation command
(RAS =”H”, CAS =”H”, WE =”H”)
The No-Operation command simply performs no operation (same command as Device Deselect).
2-11 Burst Read stop command
(RAS =”H”, CAS =”H”, WE =”L”)
The Burst stop command is used to stop the burst operation. This command is only valid during a
Burst Read operation.
2-12 Device Deselect command
(CS=”H”)
The Device Deselect command disables the command decoder so that the RAS ,CAS , WE and
Address inputs are ignored. This command is similar to the No-Operation command.
2-13 Auto Refresh command
(RAS =”L”, CAS =”L”, WE =”H”, CKE=”H”, BS0, BS1, A0 to A11=Don’t care)
The Auto Refresh command is used to refresh the row address provided by the internal refresh
counter. The Refresh operation must be performed 4096 times within 64ms. The next command
can be issued after t
RC
from the end of the Auto Refresh command. When the Auto Refresh
command is used, all banks must be in the idle state.
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