ATA20 White Electronic Designs Corporation, ATA20 Datasheet - Page 10
![no-image](/images/no-image-200.jpg)
ATA20
Manufacturer Part Number
ATA20
Description
Density = 8MB-160MB ;; Memory Device = Hitachi Flash ;; Organization = X16/x8 ;; Speed (ns) = 250 ;; Volt = 3/5 ;;
Manufacturer
White Electronic Designs Corporation
Datasheet
1.ATA20.pdf
(66 pages)
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June 2000 Rev. 5 – ECO #12935
2. Task File Register Access Specifications
There are two cases of Task File register mapping, one is the mapped I/O address area, the other is the mapped
Memory address area. Each case of Task File register read and write operations is executed under the condition as
follows. That area can be accessed by Byte/Word/Odd Byte mode which is defined by the PC card standard
specifications.
(1) I/O address map
Task File Register Read Access Mode (1)
Mode
Standby mode
Byte access (8-bit)
Word access (16-bit)
Odd byte access (8-bit) L
Note:
Task File Register Write Access Mode (1)
Mode
Standby mode
Byte access (8-bit)
Word access (16-bit)
Odd byte access (8-bit) L
Note:
Task File Register Access Timing Example (1)
7PxxxATA20xxC25
: L or H
: L or H
-CE2/-CE1
A0 to A10
D0 to D15
-IOWR
-IORD
-REG
-REG -CE2
L
L
L
-REG -CE2
L
L
L
read cycle
H
H
H
L
L
H
H
H
L
L
-CE1
H
L
L
L
H
-CE1
H
L
L
L
H
Dout
A0
L
H
A0
L
H
10
-IORD -IOWR -OE
L
L
L
L
-IORD -IOWR -OE
H
H
H
H
White Electronic Designs Corporation (508) 366-5151
H
H
H
H
L
L
L
L
H
H
H
H
H
H
H
H
write cycle
H
H
H
H
H
H
H
H
-WE
-WE
High-Z
High-Z
High-Z
odd byte
odd byte
Don’t care Don’t care
Don’t care even byte
Don’t care odd byte
odd byte
odd byte
Din
D8 to D15 D0 to D7
D8 to D15 D0 to D7
even byte
even byte
High-Z
even byte
Don’t care
High-Z
odd byte
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