參數(shù)資料
型號(hào): μPD4811650
廠商: NEC Corp.
英文描述: 16M Synchronous Graphics Memory (SGRAM)(16M同步圖形存儲(chǔ)器)
中文描述: 1,600同步圖形存儲(chǔ)器(SGRAM)(1,600同步圖形存儲(chǔ)器)
文件頁(yè)數(shù): 28/96頁(yè)
文件大?。?/td> 1517K
代理商: ΜPD4811650
28
Preliminary Data Sheet
μ
PD4811650 for Rev. E
8. Programming the Special Register
The special register is programming by the Special register set command using address bits A10 through A0 and
data bits DQ0 through DQ31. The color and mask register retain data until it is reprogrammed or the device losed
power.
The special register has four fields;
Reserved
Color register
Mask register
Reserved
: A10 through A7
: A6
: A5
: A4 through A0
Following special register programming, no command can be asserted before at least 2 CLK (t
RSC
) have elapsed.
8.1 Color Register
Color register is used as write data in Block Write cycle. In Special Register set command, if A5 is “0” and A6 is “1”,
the color register is selected. And the data of DQ0 through DQ31 is stored to color register as color data (write data).
8.2 Mask Register
Mask register is used as write mask data in Write and Block Write cycle. In Special Register set command, if A5 is
“1” and A6 is “0”, the mask register is selected. And the data of DQ0 through DQ31 is stored to mask register as
write mask data.
8.3 Special Register
10
0
0
0
0
0
0
1
2
3
4
5
7
6
8
9
Function
Not Load
Load
Bits 5
0
1
Mask Register
LC
LM
0
0
0
Function
Not Load
Load
Bits 6
0
1
Color Register
0
Remark
If LC and LM are both high (1), data of Mask and Color register will be unknown.
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