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VG4632321AQ-7 参数 Datasheet PDF下载

VG4632321AQ-7图片预览
型号: VG4632321AQ-7
PDF下载: 下载PDF文件 查看货源
内容描述: 524,288x32x2位CMOS同步图形RAM [524,288x32x2-Bit CMOS Synchronous Graphic RAM]
分类和应用:
文件页数/大小: 81 页 / 1954 K
品牌: VML [ VANGUARD INTERNATIONAL SEMICONDUCTOR ]
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Preliminary  
VG4632321A  
524,288x32x2-Bit  
CMOS Synchronous Graphic RAM  
VIS  
Addressing Mode Select Field (A3)  
The Addressing Mode can be one of two modes, Interleave Mode or Sequential Mode.  
Sequential Mode supports burst length of 1, 2, 4, 8, or full page. But, lnterleave Mode only supports  
burst length of 4 and 8.  
A3  
0
Addressing Mode  
Sequential  
1
Interleave  
--- Addressing Sequence of Sequential Mode  
An internal column address is performed by increasing the address from the column  
address which is input to the device. The internal column address is varied by the Burst  
Length as shown in the following table. When the value of column address, (n+m), in the  
table is larger than 255, only the least significant 8 bits are effective.  
Data n  
0
n
1
2
3
4
5
6
7
-
-
255  
256 257  
n+1  
-
-
Column Address  
n+1 n+2 n+3 n+4 n+5 n+6 n+7  
n+255  
n
2 words:  
4 words:  
Burst Length  
8 words:  
Full Page: Column address is repeated until terminated.  
--- Addressing Sequence of Interleave Mode  
A column access is started in the input column address and is performed by inverting the  
address bits in the sequence shown in following table.  
Data n  
Data 0  
Data 1  
Data 2  
Data 3  
Data 4  
Data 5  
Data 6  
Data 7  
Column Address  
Burst Length  
A7  
A7  
A7  
A7  
A7  
A7  
A7  
A7  
A6 A5 A4  
A3 A2  
A3 A2  
A3 A2  
A3 A2  
A3 A2  
A3 A2  
A3 A2  
A3 A2  
A1  
A1  
A1  
A1  
A1  
A1  
A1  
A1  
A0  
A0  
A0  
A0  
A0  
A0  
A0  
A0  
A6 A5 A4  
A6 A5 A4  
A6 A5 A4  
A6 A5 A4  
A6 A5 A4  
A6 A5 A4  
A6 A5 A4  
4 Words  
8 Words  
CAS Latency Field (A6 ~ A4)  
This field specifies the number of clock cycles from the assertion of the Read command  
to the first read data. The minimum value of CAS Latency depends on the frequency of  
CLK. And this value satisfying the following formula must be programmed into this field.  
t
CAC (min) £ CAS Latency x t  
CK  
A6  
0
A5  
0
A4  
CAS Latency  
Reserved  
1 clock  
0
1
0
1
X
0
0
0
1
2 clocks  
0
1
3 clocks  
1
X
Reserved  
Document:  
Rev.1  
Page16  
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