Digi NS9750 User Manual
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M e m o r y C o n t r o l l e r
Dynamic Memory Precharge Command Period register
Address: A070 0030
The Dynamic Memory Precharge Command Period register allows you to program the
precharge command period, t
RP
. Modify this register only during system initialization.
This value normally is found in SDRAM datasheets as t
RP
.
Note:
The Dynamic Memory Precharge Command Period register is used for all
four dynamic memory chip selects. The worst case value for all chip
selects must be programmed.
Register bit assignment
Bits
Access
Mnemonic
Description
D31:04
N/A
Reserved
N/A (do not modify)
D03:00
R/W
RP
Precharge command period (t
RP
)
0x0–0xE
n+1 clock cycles, where the delay is in
CLK
cycles.
0xF
16 clock cycles (reset value on
reset_n
)
Table 144: Dynamic Memory Precharge Command Period register
13
12
11
10
9
8
7
6
5
4
3
2
1
0
15
14
31
29
28
27
26
25
24
23
22
21
20
19
18
17
16
30
Reserved
Reserved
RP