Pio Data Out Commands - Samsung WA31273A Technical Manual

6-6-1-1 PIO Read Command
a)
Setup Issue
Command
BSY=0
DRDY=1
If Error Status is presented, the drive is prepared to transfer data, and it is at the host's
discretion that the data is transferred.
6-6-1-2 PIO Read Aborted Command
a)
Setup Issue
Command
BSY=0
DRDY=1
Although DRQ=1, there is no data to be transferred under this condition.
6-6-2

PIO Data Out Commands

This class includes:
• Format (50h)
• Write Buffer (E8h)
• Write Long (32h)
• Write Multiple (C5h)
• Write Sector(s) (30h)
Execution includes the transfer of one or more 512 byte (>512 bytes on Write Long)
sectors of data from the drive to the host.
a) The host writes any required parameters to the Features, Sector Count, Sector
Number, Cylinder and Drive/Head registers.
b) The host writes the command code to the Command Register.
c) The drive sets DRQ when it is ready to accept the first sector of data.
WA31273A / WA32543A / WA33203A / WA32163A / WA31083A / WA32162A 6-43
b) e)
Read
Status
BSY=1 BSY=0
DRQ=1
Assert
INTRQ INTRQ
b) e)
Read
Status
BSY=1 BSY=0
DRQ=1 DRQ=0
Assert
INTRQ INTRQ
AT INTERFACE and ATA COMMANDS
e)
Transfer Read
Data ===== Status
BSY=1 BSY=0
DRQ=0 DRQ=1
Negate Assert
INTRQ INTRQ
Negate
Transfer
Data
BSY=1
DRQ=0
Negate