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5.3 Host Commands
5.3 Host Commands
The host system issues a command to the device by writing necessary parameters
in related fields in the shadow block registers and writing a command code i
Command field of the shadow block registe
n the
rs.
tatus).
reset.
ata
ck
d.
The device can accept the command when the BSY bit is 0 (the device is not in
the busy s
The host system can halt the uncompleted command execution only at execution
of COMRESET or software
When the BSY bit is 1 or the DRQ bit is 1 (the device is requesting the PIO d
transfer) and the host system writes to the command field of the shadow blo
register, the correct device operation is not guarantee
5.3.1 Command code and parameters
Table 5.5 lists the supported commands, command code and the related fields to
be written necessary parameters at command execution.
Table 5.5 Command code and parameters (1/3)
COMMAND CODE (Bit) PARAMETER USED
COMMAND NAME
7 6 5 4 3 2 1 0 FR SC SN CY DH
RECALIBRATE 0 0 0 1 X X X X N N N N D
READ SECTOR(S) 0 0 1 0 0 0 0 R N Y Y Y Y
WRITE SECTOR(S) 0 0 1 1 0 0 0 R N Y Y Y Y
WRITE VERIFY 0 0 1 1 1 1 0 0 N Y Y Y Y
READ VERIFY SECTOR(S) 0 1 0 0 0 0 0 R N Y Y Y Y
SEEK 0 1 1 1 X X X X N N Y Y Y
EXECUTE DEVICE DIAGNOSTIC 1 0 0 1 0 0 0 0 N N N N N
INITIALIZE DEVICE PARAMETERS 1 0 0 1 0 0 0 1 N Y N N Y
DOWNLOAD MICROCODE 1 0 0 1 0 0 1 0 Y Y Y N D
STANDBY IMMEDIATE
1
1
0
1
0
1
1
0
0
0
1
0
0
0
0
0
N N N N D
IDLE IMMEDIATE
1
1
0
1
0
1
1
0
0
0
1
0
0
0
1
1
Y N Y Y D
UNLOAD IMMEDIATE
1
1
0
1
0
1
1
0
0
0
1
0
0
0
1
1
Y N Y Y D
STANDBY
1
1
0
1
0
1
1
0
0
0
1
0
1
1
0
0
N Y N N D
C141-E261 5-27