參數(shù)資料
型號: μPD4811650
廠商: NEC Corp.
英文描述: 16M Synchronous Graphics Memory (SGRAM)(16M同步圖形存儲器)
中文描述: 1,600同步圖形存儲器(SGRAM)(1,600同步圖形存儲器)
文件頁數(shù): 10/96頁
文件大?。?/td> 1517K
代理商: ΜPD4811650
10
Preliminary Data Sheet
μ
PD4811650 for Rev. E
CBR (auto) refresh command
(/CS, /RAS, /CAS, DSF = Low, /WE, CKE = High)
This command is a request to begin the CBR refresh operation. The refresh
address is generated internally.
Before executing CBR refresh, both banks must be precharged.
After this cycle, both banks will be in the idle (precharged) state and ready
for a bank activate command.
During t
RC
period (from refresh command to refresh or activate command),
the
μ
PD4811650 cannot accept any other command.
Fig.7 CBR (auto) refresh command
Add
A9
/WE
/CAS
/RAS
/CS
CKE
CLK
H
(Bank address)
DSF
Self refresh entry command
(/CS, /RAS, /CAS, DSF, CKE = Low, /WE = High)
After the command execution, self refresh operation continues while CKE
remains low. When CKE goes high, the
μ
PD4811650 exits the self refresh
mode.
During self refresh mode, refresh interval and refresh operation are
performed internally, so there is no need for external control.
Before executing self refresh, both banks must be precharged.
Fig.8 Self refresh entry command
Add
A9
/WE
/CAS
/RAS
/CS
CKE
CLK
(Bank address)
DSF
Burst stop command in full page
(/CS, /WE, DSF = Low, /RAS, /CAS = High)
This command can stop the current burst operation.
Refer to
14. Read/Write Command Interval
and
15. Burst Termination
.
Fig.9 Burst stop command
in Full Page Mode
Add
A9
/WE
/CAS
/RAS
/CS
CKE
CLK
(Bank address)
H
DSF
#
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