ATA25 White Electronic Designs Corporation, ATA25 Datasheet - Page 8

• Manufacturer Part Number: ATA25
• Description: Density = 32MB-1GB ;; Memory Device = Hitachi Flash ;; Organization = X16/x8 ;; Speed (ns) = 250 ;; Volt = 3/5
• Manufacturer: White Electronic Designs Corporation

June 2000 Rev. 1 – ECO #12936
Host access specifications
1. Attribute Access Specifications
When the CIS-ROM region or the Configuration register region is accessed, read and write operations are
executed under the condition of -REG = "L" as follows. That region can be accessed by Byte/Word/Odd-
byte modes which are defined by the PC card standard specifications.
Attribute Read Access Mode
Mode
Standby mode
Byte access (8-bit)
Word access (16-bit)
Odd byte access (8-bit)
Note:
Attribute Write Access Mode
Mode
Standby mode
Byte access (8-bit)
Word access (16-bit)
Odd byte access (8-bit)
Note:
Attribute Access Timing Example
7PxxxATA25xxC25
: L or H
: L or H
-CE2/-CE1
D0 to D15
A0 to A10
-REG
-WE
-OE
-REG
L
L
L
L
-REG
L
L
L
L
read cycle
-CE2
H
H
H
L
L
-CE2
H
H
H
L
L
Dout
-CE1
H
L
L
L
H
-CE1
H
L
L
L
H
8
A0
L
H
A0
L
H
-OE
L
L
L
L
-OE
H
H
H
H
White Electronic Designs Corporation [phone]
-WE
H
H
H
H
-WE
L
L
L
L
write cycle
High-Z
High-Z
High-Z
invalid
invalid
Don’t care
Don’t care
Don’t care
Don’t care
Don’t care
D8 to D15
D8 to D15
Din
D0 to D7
High-Z
even byte
invalid
even byte
High-Z
D0 to D7
Don’t care
even byte
Don’t care
even byte
Don’t care