參數(shù)資料
型號(hào)： VG4632321AQ-7
廠商： VANGUARD INTERNATIONAL SEMICONDUCTOR CORP
元件分類： DRAM
英文描述： 524,288x32x2-Bit CMOS Synchronous Graphic RAM
中文描述： 1M X 32 SYNCHRONOUS GRAPHICS RAM, 6 ns, PQFP100
封裝： PLASTIC, QFP-100
文件頁(yè)數(shù)： 17/81頁(yè)
文件大小： 1965K
代理商： VG4632321AQ-7
Document:
Rev.1
Page 17
VIS
Preliminary
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
Mode field (A8~A7)
A7 and A8 must be programmed to “00” in normal operation.
A8
A7
Test Mode
0
0
normal mode
0
1
Vendor Use Only
1
x
Vendor Use Only
Single Write Mode (A9)
This bit is used to select the write mode. When the A9 bit is “0”, Burst Read and Burst Write mode is
selected. When the A9 bit is ”1”, Burst Read and Single Write mode is Selected.
A9
Single Write Mode
0
Burst Read and Burst Write
1
Burst Read and Single Write
12 Special Mode Register Set command
(RAS = ”L”, CAS = ”L”, WE = ”L”, DSF = ”H”, BS, A0-A10 = Register Data)
The special mode register is used to load the Color and Mask registers, which are used in Block
Write and masked Write cycles. The control information being written to the Special Mode register is
applied to the address inputs and the data to be written to either the Color register or the Mask register is
applied to the DQs. When A6 is “high” during a Special Mode Register Set cycle, the Color register will be
loaded with the data on the DQs. Similarly, when A5 is “high” during a Special Mode Register Set cycle,
the Mask register will be loaded with the data on the DQs. A6 = A5 = 1 in the Special Mode Register Set
cycle is illegal.
On
e clock cycle is required to complete the write in the Special Mode register. This command can
be issued at the active state. As in write operation, this command accepts the data needed through DQ
pins. Therefore it should be attended not to induce bus contention.
13 No-Operation command
(RAS = ”H”, CAS = ”H”, WE = ”H”)
The No-Operation command is used to perform a NOP to SGRAM which is selected (CS is Low).
This prevents unwanted commands from being registered during idle or wait states.
14 Burst Stop command
(RAS = ”H”, CAS = ”H”, WE = ”L’, DSF = ”L”)
Burst Stop command is used to terminate either fixed-length or full-page bursts. This command is
only effective in a read/write burst without auto precharge function. The terminated read burst ends after
a delay equal to the CAS latency (refer to the following figure). The termination of a write burst is shown
in the following figure.
Functions
BS
A10~A7
A6
A5
A4~A0
Leave Unchanged
X
X
0
0
X
Load Mask Register
X
X
0
1
X
Load Color Register
X
X
1
0
X
Illegal
X
X
1
1
X
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