ep9307 Cirrus Logic, Inc., ep9307 Datasheet - Page 24

• Manufacturer Part Number: ep9307
• Description: Arm9 Soc With Ethernet, Usb, Display, And Touchscreen
• Manufacturer: Cirrus Logic, Inc.

EP9307
ARM9 SOC with Ethernet, USB, Display and Touchscreen
Static Memory 32-bit Write on 16-bit External Bus
24
AD setup to WRn assert time
WRn/DQMn deassert to AD transition time
AD hold from WRn deassert time
CSn hold from WRn deassert time
CSn to WRn assert delay time
WRn assert time
WRn deassert time
CSn to DQMn assert delay time
DQMn assert time
DQMn deassert time
WRn / DQMn deassert to DA transition time
WRn / DQMn assert to DA valid time
DQMn
WAIT
WRn
RDn
CSn
AD
DA
Parameter
t
ADs
t
DQMd
t
WRd
Figure 11. Static Memory Multiple Word Write 16-bit Cycle Timing Measurement
©
t
Copyright 2005 Cirrus Logic (All Rights Reserved)
DAV
Symbol
t
t
t
t
t
DQMpwH
WRpwL
t
DQMpwL
DQpwL
WRpwH
t
WRpwL
t
t
DQMd
t
t
t
t
t
DAh1
WRd
ADs
ADd
ADh
CSh
DAV
t
t
HCLK
HCLK
t
Min
HCLK
t
DAh
7
-
-
-
-
-
-
-
-
t
t
– 3
× 2
WRpwH
DQpwH
t
ADd
t
t
HCLK
HCLK
t
DAV
× (WST1 + 1)
× (WST1 + 1)
Typ
-
-
-
-
-
-
-
-
-
-
t
t
WRpwL
DQpwL
t
ADh
(t
(t
HCLK
HCLK
t
HCLK
Max
× 2) + 14
2
1
8
-
-
-
-
-
× 2) + 7
-
+ 6
t
CSh
t
DAh
DS667PP4
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns