Bit
Bit name
Function
...
...
F
H
16 clocks
13 to 12
TWR[1:0]
TWR[1:0] defines the delay from last data in to next precharge command for writes.
00
B
1 clock (default)
01
B
2 clocks
10
B
3 clocks
11
B
4 clocks
11 to 9
TRP[2:0]
TRP[2:0] defines the precharge period.
000
B
1 clock
001
B
2 clocks
010
B
3 clocks (default)
...
...
111
B
8 clocks
8 to 6
TRCD[2:0]
TRCD[2:0] defines the minimum delay between active and read/write commands.
000
B
1 clock
001
B
2 clocks (default)
...
...
111
B
8 clocks
5 to 2
TRASMIN[3:0]
TRASMIN[3:0] defines the minimum delay between active and precharge commands.
0
H
1 clock
1
H
2 clocks
...
...
4
H
5 clocks (default)
...
...
F
H
16 clocks
1 to 0
CASLAT[1:0]
CASLAT[1:0] defines the delay between a read command and the availability of first data.
00
B
1 clock
01
B
2 clocks
10
B
3 clocks (default)
11
B
4 clocks
Chapter 9
External Memory Interface Controller
318
Preliminary User's Manual S19203EE1V3UM00
Содержание uPD72257
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