ATA25 White Electronic Designs Corporation, ATA25 Datasheet - Page 36

• 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
12. Device control register: This register is a write only register, and it is used for controlling the card
interrupt request and issuing an ATA soft reset to the card.
bit7
bit
7 to 4
3
2
1
0
13. Drive Address register: This register is a read only register, and it is used for confirming the drive
status. This register provides for compatibility with the AT disk drive interface. It is recommended that
this register not be mapped into the host’s I/O space because of potential conflicts on bit7.
bit7
bit
7
6
5 to 2 nHS3-0 (Head Select3-0)
1
0
ATA Command Specifications
This table summarizes the ATA command set with the paragraphs. The following shows the support
commands and command codes which are written in the command registers.
7PxxxATA25xxC25
Name
1
SRST (Software ReSeT)
nIEN (Interrupt ENable)
0
Name
nWTG (WriTing Gate)
nDS1 (Idrive Select1)
nDS0 (Idrive Select0)
bit6
bit6
nWTG
bit5
bit5
nHS3
bit4
bit4
nHS2
Function
don't care
This bit is set to "1".
Reset operation. This does not change the Card Configuration
registers as a Hardware Reset does. The card remains in Reset
until this bit is reset to "0".
is enabled. When this bit is set to "1", -IREQ is disabled.
This bit is set to "0".
Function
This bit is unknown
This bit is unknown
theDrive/Head register.
This bit is set to "1" in order to force the card to perform Task File
This bit is used for enabling -IREQ. When this bit is set to "0", -IREQ
These bits are the negative value of Head Select bits (bit 3 to 0) in
This bit is unknown
This bit is unknown
36
bit3
1
bit3
nHS1
White Electronic Designs Corporation [phone]
bit2
SRST
bit2
nHS0
bit1
nIEN
bit1
nDS1
bit0
0
bit0
nDS0