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User Manual version 2305
APOLLO 120/150 III
7-119
u LD-OFF DRAM RD/WR CYCLES
The item is lead-off time control for DRAM Read/Write Cycles.
When select 'Delay 1T', memory read/write command is
issued 1 clock behind memory address (MA) been issued.
When select 'Normal', read/write command amd MA are
issued at the same time.
The choice: Delay 1T or Normal.
u WRITE RECOVERY TIME
This item defines the Data-in to PRE command period.
The choice: 1T or 2T
u VCM REF TO ACT/REF DELAY
This item defines VCM REF to REF/ACT command period.
The choice: 10T, or 9T.
u VCM ACCT TO ACT/REF DELAY
This item defines VCM ACT to ACT/REF command period.
The choice: 10T, 9T, 8T or Reserved.
u EARLY CKE DELAY 1T CNTRL
When this item is enabled, CKE is driven out from flip-flop. It
is used when system operates under low frequency and CKE
delay adjustment method defined in the 'Early CKE Delay
Adjustment' which can not meet setup time and hold time
requirement.
The choice: Normal, Delay 1T.
u Early CKE Delay Adjust
This item controls the timing for CKE. Various delay options
are provided to ensure that CKE can meet SDRAM setup time
and hold time specification when CKE is driven out.
The Choice: 1ns, 2ns, 3ns, 4ns, 5ns, 6ns, 7ns, 8ns.
u MEM COMMAND OUTPUT TIME
This item is to control the timing to drive memory command
onto memory bus.
The choice: Normal, Delay 1T.