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Memory Controller
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
13121110987654321015 14
31 29 28 27 26 25 24 23 22 21 20 19 18 17 1630
Reserved
Reserved RP