HYB25L512160AC Datasheet, PDF (37/50 Pages) Infineon Technologies AG – 512MBit Mobile-RAM

HYB25L512160AC–7.5
512MBit Mobile-RAM
Functional Description
3.4.8.2 CONCURRENT AUTO PRECHARGE
A READ or WRITE burst with Auto Precharge enabled can be interrupted by a subsequent READ or WRITE
command issued to a different bank.
Figure 40 shows a READ with Auto Precharge to bank n, interrupted by a READ (with or without Auto Precharge)
to bank m. The READ to bank m will interrupt the READ to bank n, CAS latency later. The precharge to bank n
will begin when the READ to bank m is registered.
Figure 41 shows a READ with Auto Precharge to bank n, interrupted by a WRITE (with or without Auto Precharge)
to bank m. The precharge to bank n will begin when the WRITE to bank m is registered. DQM should be pulled
HIGH two clock cycles prior to the WRITE to prevent bus contention.
Figure 42 shows a WRITE with Auto Precharge to bank n, interrupted by a READ (with or without Auto Precharge)
to bank m. The precharge to bank n will begin t_WR after the new command to bank m is registered. The last valid
data-in to bank n is one clock cycle prior to the READ to bank m.
Figure 43 shows a WRITE with Auto Precharge to bank n, interrupted by a WRITE (with or without Auto
Precharge) to bank m. The precharge to bank n will begin t_WR after the WRITE to bank m is registered. The last
valid data-in to bank n is one clock cycle prior to the WRITE to bank m.
CLK
Command NOP
Address
DQ
RD-AP
Bank n
Col b
NOP
CL=2
READ
Bank m
Col x
DO b
NOP
NOP
t_RP (bank n)
DO b+1
DO x
NOP
NOP
DO x+1 DO x+2
RD-AP = Read with Auto Precharge; READ = Read with or without Auto Precharge
CL = 2 and Burst Length = 4 in the case shown
Read with Auto Precharge to bank n is interrupted by subsequent Read to bank m
= Don't Care
Figure 40 READ with Auto Precharge Interrupted by READ
CLK
Command
Address
DQM
NOP
DQ
RD-AP
Bank n
Col b
NOP
CL=2
NOP
WRITE
Bank m
Col x
NOP
NOP
NOP
DO b
t_RP (bank n)
DI x
DI x+1
DI x+2 DI x+3
RD-AP = Read with Auto Precharge; WRITE = Write with or without Auto Precharge
CL = 2 and Burst Length = 4 in the case shown
Read with Auto Precharge to bank n is interrupted by subsequent Write to bank m
= Don't Care
Figure 41 READ with Auto Precharge Interrupted by WRITE
Data Sheet
37
Rev. 1.3, 2004-04
10212003-BSPE-77OL