參數(shù)資料
型號(hào): μPD481850
廠商: NEC Corp.
英文描述: Synchronous Graphics Memory (SGRAM)(8M 同步圖形存儲(chǔ)器)
中文描述: 同步圖形存儲(chǔ)器(SGRAM)(8分同步圖形存儲(chǔ)器)
文件頁(yè)數(shù): 11/94頁(yè)
文件大?。?/td> 1180K
代理商: ΜPD481850
Preliminary Data Sheet
11
μ
PD481850 for Rev.L
No operation
(/CS, DSF = Low, /RAS, /CAS, /WE = High)
This command is not a execution command. No operations begin or
terminate by this command.
Special register set command
(/CS, /RAS, /CAS, /WE = Low, DSF = High)
The
μ
PD481850 has two special registers for graphics commands. One
is color register and the other is mask register. In this command, A0
through A9 are the data input pins for the register select (color or mask
register). DQ0 through DQ31 are the data input pins for the Color data or
the WPB data.
During 2
CLK (t
RSC
) following this command, the
μ
PD481850 can not
accept any other commands.
Refer to
8. Programming the Special Register
.
Masked block write command
(/CS, /CAS, /WE = Low, /RAS, DSF = High)
This command activates 8-column block write function. In this command,
the burst length = 1. Write data comes from color register, column address
mask data is input from DQi in this command.
Refer to
13. Block Write
.
Fig.10 No operation
Add
A8
/WE
/CAS
/RAS
/CS
CKE
CLK
H
(Bank address)
DSF
Fig.11 Special register set
command
/WE
/CAS
/RAS
/CS
CKE
CLK
H
DSF
Add
A8
A9
DQi
Color/Mask
Fig.12 Masked block write
command
/WE
/CAS
/RAS
/CS
CKE
CLK
H
DSF
Add
A8
A9
DQi
Column Mask
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