is42s16160a1-7t Integrated Silicon Solution, Inc., is42s16160a1-7t Datasheet - Page 28

• Manufacturer Part Number: is42s16160a1-7t
• Description: 256 Mb Synchronous Dram
• Manufacturer: Integrated Silicon Solution, Inc.

IS42S83200A1
IS42S16160A1
28
DQM CONTROL
DQM is a dual function signal defined as the data mask
for writes and the output disable for reads. During writes,
DQM(U,L) masks input data word by word. DQM(U,L)
Command
DQMU/L
CLK
DQ
(4-bank x 8,388,608 - word x 8-bit)
(4-bank x 4,194,304 - word x 16-bit)
Write
D0
masked by DQMU/L=H
D2
D3
DQM Function
Read
to write mask latency is 0. During reads, DQM(U,L)
forces output to Hi-Z word by word. DQM(U,L) to output
Hi-Z latency is 2.
Integrated Silicon Solution, Inc. — 1-800-379-4774
Q0
disabled by DQMU/L=H
Q1
Q3
ISSI
10/28/05
Rev. B
®