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| 型號： | TMS418169P-80 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 1048576-WORD BY 16-BIT EXTENDED DATA OUT HIGH-SPEED DRAMS |
| 中文描述： | 1048576字由16位擴(kuò)充數(shù)據(jù)輸出高速DRAM等 |
| 文件頁數(shù)： | 19/67頁 |
| 文件大小： | 1464K |
| 代理商： | TMS418169P-80 |
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TMS55160, TMS55161, TMS55170, TMS55171
262144 BY 16-BIT MULTIPORT VIDEO RAMS
SMVS464
–
MARCH1996
19
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251
–
1443
4-column block write (TMS5516x)
The 4-column block-write function allows up to 64 bits of data to be written simultaneously to one row of the
memory array. This function is implemented as 4 columns
×
4 DQs and repeated in four quadrants. In this
manner, each of the four one-megabit quadrants can have up to four consecutive columns written at a time with
up to four DQs per column (see Figure 9).
DQ4
DQ14
DQ0
Four Consecutive Columns of 0
–
511
DQ1
DQ2
DQ3
DQ5
DQ6
DQ7
DQ8
DQ9
DQ10
DQ11
DQ12
DQ13
DQ15
4th Quadrant
3rd Quadrant
2nd Quadrant
1st Quadrant
One Row of 0
–
511
Figure 9. 4-Column Block-Write Operation
Each one-megabit quadrant has a 4-bit column mask to mask off any or all of the four columns from being written
with data. Nonpersistent write-per-bit or persistent write-per-bit functions can be applied to the block-write
operation to provide write-masking options. Write data (color data) is provided by four bits from the on-chip color
–
3 from the 16-bit write-mask register, bits 0
–
3 from the 16-bit column-mask register, and
bits 0
–
3 from the 16-bit color-data register configure the block write for the first quadrant, while bits 4
–
7, 8
–
11,
and 12
–
15 of the corresponding registers control the other quadrants in a similar fashion (see Figure 10).
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