ep9307 Cirrus Logic, Inc., ep9307 Datasheet - Page 22

• 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 8-bit External Bus
22
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 9. Static Memory Multiple Word Write 8-bit Cycle Timing Measurement
t
DAV
t
t
WRpwL
DQMpwL
©
Copyright 2005 Cirrus Logic (All Rights Reserved)
t
t
WRpwH
DQMpwH
t
DAh
Symbol
t
t
t
t
DQMpwH
ADd
t
DQMpwL
WRpwH
t
WRpwL
t
DQMd
t
t
t
t
t
t
WRd
ADs
ADd
ADh
CSh
DAh
DAV
t
DAV
t
t
WRpwL
DQMpwL
t
t
WRpwH
DQMpwH
t
t
HCLK
HCLK
t
Min
HCLK
7
-
-
-
-
-
-
-
-
t
DAh
− 3
× 2
t
ADd
t
DAV
t
t
WRpwL
DQMpwL
t
t
HCLK
HCLK
t
t
WRpwH
DQMpwH
t
HCLK
× (WST1 + 1)
× (WST1 + 1)
Typ
-
-
-
-
-
-
-
-
-
t
DAh
× 2
t
ADd
t
DAV
t
CSh
t
ADh
(t
(t
HCLK
HCLK
t
HCLK
Max
× 2) + 14
2
1
8
× 2) + 7
-
-
-
-
-
-
t
DAh
+ 6
DS667PP4
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns