ATA20 White Electronic Designs Corporation, ATA20 Datasheet - Page 35

• 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
9. Status register: This register is a read only register, and it indicates the card status of command
execution. Other bits are invalid when BSY bit is "1". When this register is read, -IREQ is negated. When
the host writes the command code to Command register, bits 0, 4 and 6 are cleared and bit 7 is set.
bit7
BSY
bit
7
6
5
4
3
2
1
0
10. Alternate status register: This register is the same as the Status register physically, so the bit
assignment refers to a previous item of Status register. But this register is different from the Status register
that -IREQ is not negated when data is read.
11. Command register: This register is a write only register, and it is used for writing the command at
executing the drive operation. The command code written in the command register, after the parameter is
written in the Task File during the card, is Ready state.
7PxxxATA20xxC25
Name
BSY (BuSY)
DRDY (Drive ReaDY)
DWF (Drive Write Fault)
DSC (Drive Seek Complete)
DRQ (Data ReQuest)
CORR (CORRected data
IDX (InDeX)
ERR (ERRor)
bit6
DRDY
bit5
DWF
bit4
DSC
Function
this bit is set to "1", other bits in this register are invalid.
the read or write or seek requests. If this bit is set to "0", the card
prohibits these requests.
This bit is set when the information can be transferred between the
host and Data register. This bit is cleared when the card receives
the other command.
This bit is set when a correctable data error has occurred and the
data has been corrected.
of error. The error information is set in the other Status register or
Error register. This bit is cleared by the next command.
This bit is set when the card internal operation is executing. When
If this bit and DSC bit are set to "1", the card is capable of receiving
This bit is set if this card indicates the write fault status.
This bit is set when the drive seek complete.
This bit is always set to "0".
This bit is set when the previous command has ended in some type
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bit3
DRQ
White Electronic Designs Corporation [phone]
bit2
CORR
bit1
IDX
bit0
ERR