PS/2 Model 30 Mode
7
6
5
4
3
2
1
0
INT
PENDING
DRQ STEP TRK0 nHDSEL INDX
F/F
WP
nDIR
RESET
COND.
0
0
0
N/A
1
N/A
N/A
1
BIT 0 nDIRECTION
BIT 4 TRACK 0
Active low status indicating the direction of head
movement. logic "0" indicates inward
Active high status of the TRK0 disk interface
input.
A
direction; a logic "1" indicates outward direction.
BIT 5 STEP
BIT 1 WRITE PROTECT
Active high status of the latched STEP disk
interface output pin. This bit is latched with the
STEP output going active and is cleared with a
read from the DIR register or with a hardware or
software reset.
Active high status of the WRITE PROTECT disk
interface input. A logic "1" indicates that the disk
is write protected.
BIT 2 INDEX
Active high status of the INDEX disk interface
input.
BIT 6 DMA REQUEST
Active high status of the DRQ output pin.
BIT 3 nHEAD SELECT
BIT 7 INTERRUPT PENDING
Active high bit indicating the state of the Floppy
Disk Interrupt output.
Active low status of the HDSEL disk interface
input. A logic "0" selects side 1 and a logic "1"
selects side 0.
17
SMSC [ SMSC CORPORATION ]
