FDC37B78X SMSC Corporation, FDC37B78X Datasheet - Page 18

• Manufacturer Part Number: FDC37B78X
• Description: Enhanced Super I/O Controller with ACPI Support/ Real Time Clock and Consumer IR
• Manufacturer: SMSC Corporation

PS/2 Model 30 Mode
BIT 0 nDIRECTION
Active low status indicating the direction of head
movement.
direction; a logic "1" indicates outward direction.
BIT 1 WRITE PROTECT
Active high status of the WRITE PROTECT disk
interface input. A logic "1" indicates that the disk
is write protected.
Protect Function)
BIT 2 INDEX
Active high status of the INDEX disk interface
input.
BIT 3 nHEAD SELECT
Active low status of the HDSEL disk interface
input. A logic "0" selects side 1 and a logic "1"
selects side 0.
RESET
COND.
A
logic
PENDING
(See also Force Write
INT
7
0
"0"
indicates
DRQ
6
0
inward
STEP
F/F
5
0
18
TRK0 nHDSEL INDX
N/A
4
BIT 4 TRACK 0
Active high status of the TRK0 disk interface
input.
BIT 5 STEP
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.
BIT 6 DMA REQUEST
Active high status of the DRQ output pin.
BIT 7 INTERRUPT PENDING
Active high bit indicating the state of the Floppy
Disk Interrupt output.
3
1
N/A
2
WP
N/A
1
nDIR
0
1