24 Copyright 2010 Cirrus Logic (All Rights Reserved) DS667F2
EP9307
ARM9 SOC with Ethernet, USB, Display and Touchscreen
Static Memory 32-bit Write on 16-bit External Bus
Parameter Symbol Min Typ Max Unit
AD setup to WRn assert time
t
ADs
t
HCLK
– 3 -
-ns
WRn/DQMn deassert to AD transition time
t
ADd
-
-t
HCLK
+ 6
ns
AD hold from WRn deassert time
t
ADh
t
HCLK
× 2 -
-ns
CSn hold from WRn deassert time
t
CSh
7
-
-ns
CSn to WRn assert delay time
t
WRd
--2ns
WRn assert time
t
WRpwL
-
t
HCLK
× (WST1 + 1)
-ns
WRn deassert time
t
WRpwH
--
(t
HCLK
× 2) + 14
ns
CSn to DQMn assert delay time
t
DQMd
--1ns
DQMn assert time
t
DQMpwL
-
t
HCLK
× (WST1 + 1)
-ns
DQMn deassert time
t
DQMpwH
--
(t
HCLK
× 2) + 7
ns
WRn / DQMn deassert to DA transition time
t
DAh1
t
HCLK
-
-ns
WRn / DQMn assert to DA valid time
t
DAV
--
8ns
Figure 11. Static Memory Multiple Word Write 16-bit Cycle Timing Measurement
CSn
WRn
RDn
DQMn
AD
DA
t
ADs
t
WRd
t
WRpwL
t
DAh
t
ADd
t
WRpwH
t
DQMd
t
ADh
t
DAh
t
WRpwL
t
DQpwL
t
DQpwH
t
DQpwL
WAIT
t
CSh
t
DAV
t
DAV
