ATA20 White Electronic Designs Corporation, ATA20 Datasheet - Page 33

• 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

June 2000 Rev. 5 – ECO #12935
1. Data register: This register is a 16 bit register that has read/write ability, and it is used for transferring
1 sector data between the card and the host. This register can be accessed in word mode and byte mode.
This register overlaps the Error or Feature register.
bit15 bit14 bit13 bit12 bit11 bit10 bit9
2. Error register: This register is a read only register, and it is used for analyzing the error content at the
card accessing. This register is valid when the BSY bit in Status register and Alternate Status register are
set to "0" (Ready).
bit7
BBK
bit
7
6
4
2
0
3. Feature register: This register is a write only register and provides information regarding features of
the drive which the host wishes to utilize.
bit7
4. Sector count register: This register contains the numbers of sectors of data requested to be transferred
on a read or write operation between the host and the card. In this card, the plural sector transfer is
available across the Track or Cylinder. If the value of this register is zero, a count of 256 sectors is
specified. In the plural sector transfer, if not successfully completed, the register contains the number of
sectors which need to be transferred in order to complete the request. This register's initial value is "01H".
bit7
7PxxxATA20xxC25
Name
BBK (Bad block detected)
UNC (Data ECC error)
IDNF (I D Not Found)
ABRT (ABoRTed command)
AMNF (Address Mark Not Found) This bit is set in case of a general error.
bit6
UNC
bit6
bit6
bit5
“0”
bit5
bit5
bit4
IDNF
bit4
bit4
Function
card.
status condition. (Not ready, Write fault, Invalid command, etc.)
This bit is set when a Bad Block is detected in requested ID field.
This bit is set when an uncorrectable error occurs when reading the
The requested sector ID is in error or cannot be found.
This bit is set if the command has been aborted because of the card
Sector count byte
bit8
Feature byte
D0 to D15
33
bit7
bit3
“0”
bit3
bit3
bit6
White Electronic Designs Corporation [phone]
bit5
bit2
ABRT
bit2
bit2
bit4
bit3
bit1
“0”
bit1
bit1
bit2
bit1
bit0
AMNF
bit0
bit0
bit0