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參數(shù)資料
| 型號(hào)： | SMJ44C251 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 262144 BY 4-BIT MULTIPORT VIDEO RAM |
| 中文描述： | 262144 4位多端口視頻內(nèi)存 |
| 文件頁(yè)數(shù)： | 11/53頁(yè) |
| 文件大小： | 950K |
| 代理商： | SMJ44C251 |
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SMJ44C251B
262144 BY 4-BIT
MULTIPORT VIDEO RAM
SGMS058A – MARCH 1995 – REVISED JUNE 1995
11
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251–1443
block write cycle (continued)
1
2
3
2
3
2
3
4
5
6
5
5
Load-Color-Register Cycle
Block-Write Cycle
(no DQ mask)
Block-Write Cycle
(load and use DQ mask)
Block-Write Cycle
(use previously
loaded DQ mask)
RAS
CAS
A0–A8
W
TRG
DSF
DQ0–DQ3
W must be low during the block-write cycle.
NOTE: DQ0–DQ3 are latched on the later of W or CAS falling edge except in block 6 (see legend).
Legend:
1. Refresh address
2. Row address
3. Block address (A2 –A8)
4. Color-register data
5. Column-mask data
6. DQ-mask data. DQ0–DQ3 are latched on the falling edge of RAS.
= don’t care
Figure 2. Example Block-Write Diagram Operations
N
DQ0
DQ
Write-Mask
Register
N + 1
N + 2
N + 3
I/O3
I/O2
I/O1
I/O0
Block-Write
Enable
Load
Color
Register
DQ1
DQ2
DQ3
MUX
MUX
MUX
MUX
4-of-512
Decode
1-of-4
Decode
A2–A8
Write
Select
Write
Select
Write
Select
Write
Select
Color
Register
Load Write
Mask
Write
Enable
Data
In
MUX
Block-Write
Enable
A0–A1
Figure 3. Block-Write Circuit Block Diagram
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| SMJ44C251A-12JDM | 制造商:Texas Instruments 功能描述: |
| SMJ44C251B | 制造商:AUSTIN 制造商全稱:Austin Semiconductor 功能描述:256K X 4 VRAM 256K x 4 DRAM with 512K x 4 SAM |
| SMJ44C251B10HJM | 制造商:AUSTIN 制造商全稱:Austin Semiconductor 功能描述:256K X 4 VRAM 256K x 4 DRAM with 512K x 4 SAM |
| SMJ44C251B-10HJM | 制造商:AUSTIN 制造商全稱:Austin Semiconductor 功能描述:256K X 4 VRAM 256K x 4 DRAM with 512K x 4 SAM |
| SMJ44C251B10HMM | 制造商:AUSTIN 制造商全稱:Austin Semiconductor 功能描述:256K X 4 VRAM 256K x 4 DRAM with 512K x 4 SAM |
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