Apollo 120, 150 LD-OFFDRAM RD/WR Cycles, VCM REF to ACT/REF Delay, VCM Acct to ACT/REF Delay

User Manual version 2007

uLD-OFFDRAM 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.

uWRITE RECOVERY TIME

This item defines the Data-in to PRE command period. The choice: 1T or 2T

uVCM REF TO ACT/REF DELAY

This item defines VCM REF to REF/ACT command period. The choice: 10T, or 9T.

uVCM ACCT TO ACT/REF DELAY

This item defines VCM ACT to ACT/REF command period. The choice: 10T, 9T, 8T or Reserved.

uEARLY 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.

uEarly 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.

uMEM COMMAND OUTPUT TIME

This item is to control the timing to drive memory command onto memory bus.

The choice: Normal, Delay 1T.

APOLLO 120/150 III 7-117