Registers
222
NS9750 Hardware Reference
Dynamic Memory Active Bank A to Active Bank B Time register
Address: A070 0054
The Dynamic Memory Active Bank A to Active Bank B Time register allows you to
program the active bank A to active bank B latency, tRRD. It is recommended that this
register be modified during system initialization, or when there are no current or
outstanding transactions. Wait until the memory controller is idle, then enter low-
power or disabled mode. This value normally is found in SDRAM datasheets as tRRD.
Note:
The Dynamic Me mory Active Ba nk A to Active B ank B Time regist er 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 RRD Active bank A to Active bank B latency
0x0–0xE
n+1 clock cycles, where the delay is in CLK cycles
0xF
16 clock cycles (reset on reset_n)
Table 153: Dynamic Memory Active Bank A to Active Bank B Time register
13121110987654321015 14
31 29 28 27 26 25 24 23 22 21 20 19 18 17 1630
Reserved
Reserved RRD