IC42S16102 Datasheet, PDF (29/78 Pages) Integrated Circuit Solution Inc – 512K x 16 Bit x 2 Banks (16-MBIT) SDRAM

IC42S16102
Interval Between Read and Write Commands
A read command can be interrupted and a new write
command executed while the read cycle is in progress, i.
e., before that cycle completes. Data corresponding to the
new write command can be input at the point new write
command is executed. To prevent collision between input
and output data at the I/On pins during this operation, the
output data must be masked using the U/LDQM pins. The
interval (tCCD) between these commands must be at least
one clock cycle.
The selected bank must be set to the active state before
executing this command.
CLK
COMMAND
tCCD
READ A0 WRITE B0
U/LDQM
HI-Z
I/O
DIN B0 DIN B1 DIN B2
READ (CA=A, BANK 0) WRITE (CA=B, BANK 0)
CAS latency = 2, 3, burst length = 4
DIN B3
Integrated Circuit Solution Inc.
29
DR042-0A 01/18/2005