FDC37C672QFP SMSC Corporation, FDC37C672QFP Datasheet - Page 20

• Manufacturer Part Number: FDC37C672QFP
• Description: ENHANCED SUPER I/O CONTROLLER WITH FAST IR
• Manufacturer: SMSC Corporation

SMSC FDC37C672
PS/2 Model 30 Mode
BIT 0 nDIRECTION
Active low status indicating the direction of head movement. A logic "0" indicates inward 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.
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.
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.
RESET
COND.
PENDING
INT
7
0
DRQ
6
0
DATASHEET
STEP
F/F
5
0
Page 20
TRK0 nHDSEL
N/A
4
3
1
INDX
N/A
2
Enhanced Super I/O Controller with Fast IR
N/A
WP
1
nDIR
0
1
Rev. 10-29-03
Datasheet