ATA25 White Electronic Designs Corporation, ATA25 Datasheet - Page 11

• 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
3. True IDE Mode
The card can be configured in a True IDE Mode of operation. This card is configured in this mode only when the -OE
input signal is asserted low by the host during the power off to power on cycle. In this True IDE Mode the PCMCIA
protocol and configuration are disabled and only I/O operations to the Task File and Data Register are allowed. In this
mode no Memory or Attribute Registers are accessible to the host. The card permits 8 bit access if the user issues a Set
Feature Command to put the device in the 8 bit Mode.
True IDE Mode Read I/O Function
Mode
Invalid mode
Standby mode
Data register access
All status access
Other task file access
Note:
True IDE Mode Write I/O Function
Mode
Invalid mode
Standby mode
Data register access
Control register access
Other task file access
Note:
True IDE Mode I/O Access Timing Example
7PxxxATA25xxC25
D0 to D15
A0 to A2
-IOIS16
: L or H
: L or H
-IOWR
-IORD
-CE
read cycle
-CE2
L
H
H
L
H
-CE2
L
H
H
L
H
Dout
-CE1
L
H
L
H
L
-CE1
L
H
L
H
L
A0 to A2 -IORD
0
6H
1-7H
A0 to A2 -IORD
0
6H
1-7H
11
L
L
L
H
H
H
White Electronic Designs Corporation [phone]
write cycle
H
H
H
L
-IOWR
-IOWR
L
L
D8 to D15 D0 to D7
High-Z
High-Z
odd byte
High-Z
High-Z
D8 to D15 D0 to D7
don’t care
don’t care
odd byte
don’t care
don’t care
Din
High-Z
High-Z
even byte
status out
data
don’t care
don’t care
even byte
control in
data