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參數(shù)資料
| 型號： | KM4216C258 |
| 廠商： | SAMSUNG SEMICONDUCTOR CO. LTD. |
| 英文描述： | 256K x 16 Bit CMOS Video RAM(256K x 16 位 CMOS視頻RAM) |
| 中文描述： | 256K × 16位的CMOS視頻RAM（256K × 16位的CMOS視頻內(nèi)存） |
| 文件頁數(shù)： | 22/41頁 |
| 文件大?。?/td> | 772K |
| 代理商： | KM4216C258 |
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KM4216C258
CMOS VIDEO RAM
Rev. 0.1 (Mar. 1998)
DEVICE OPERATIONS
( Continued)
Programmable Split SAM
In split SAM mode, SAM is divided into the lower half and the
upper half, After the last address of each half SAM (255 or 511)
is accessed, the access will be changed one half of the SAM to
the other half (at the loaded Tap address). This last address is
called stop point.
The KM4216C258 offers user-programmable Stop Points. The
Stop Points and size of the resulting partitions are shown in
Table 2. The Stop Point is set by performing CBRS cycle. The
CBRS cycle
′
s condition is WB/WE low, DSF high at the falling
edge of RAS in CBR cycle and the Stop Point is determined by
row address entering at this time.
The Stop Point will not become valid until a SRT cycle is done.
The Stop Point does not effect to SAM in normal RT, RRT cycle.
In Figure 12. programmable split SAM operation is shown. if a
SRT cycle was done before the partition boundary (383), the
access will jump to the TAP address (70) of the next half. Other-
wise, the access will continue in the same half until a SRT
occurs at the SAM half boundary (255, 511). Note that the Stop
Point may be changed at any time by performing another CBRS,
and New Stop Point will not be valid until a SRT is performed.
To reset Stop Point, CBRR cycle must be performed. CBRR is a
CBR cycle with DSF low at the falling edge of RAS
The CBRR will take effect immediately ; it does not require a
SRT to become active valid.
Figure 12. Programmable Split SAM Operation
RAS
CBRS
RT
SRT
Table. 2 Stop Point Se
tt
ing Address
Stop Register = Store The Address of Serial Access
Use on the Split Transfer Cycle
Stop Pointer Set CBRS Cycle
Number
Stop Points
/
Half
Partition
Stop Point Se
tt
ing Address
A
8
A
7
A
6
A
5
A
4
A
3
~A
0
1
(1x256)x2
X
1
1
1
1
X
2
(2x128)x2
X
0
1
1
1
X
4
(4x64)x2
X
0
0
1
1
X
8
(8x32)x2
X
0
0
0
1
X
16
(16x16)x2
X
0
0
0
0
X
*Other Case = Inhibit, X =don
′
t care.
SRT
455
70
R3
R2
R1 351
127
A
0
~A
8
WB/WE
DT/OE
DSF
SC
SQ
0
~SQ
15
QSF
No Split Transfer
(001111111) = 2 Stop Point / Half
SP
SP
SP
Previous Value
351 352
.....
381 382 383
70
71
127
455
511
.....
251
.....
255
128 129
252 253 254
455 456
383
256
70
255
127
0
(351)
Start Addr.
*SP : Stop Point
Tap = 70
Tap = 455
CASL
CASU
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