nINDEX, Bit 2
Active low status of the INDEX disk interface input.
Head Select, Bit 3
Active high status of the HDSEL disk interface input. A logic “1” selects side 1 and a logic “0” selects side 0.
nTRACK 0, Bit 4
Active low status of the TRK0 disk interface input.
Step, Bit 5
Active high status of the STEP output disk interface output pin.
nDRV2, Bit 6
Active low status of the DRV2 disk interface input pin, indicating that a second drive has been installed.
Interrupt Pending, Bit 7
Active high bit indicating the state of the Floppy Disk Interrupt output.
PS/2 Model 30 Interface Mode
Table 6 - SRA PS/2 Model 30 Mode
7
6
5
4
3
2
1
0
INT
DRQ
STEP F/F TRK0
nHDSEL
INDX
WP
nDIR
PENDING
RESET
0
0
0
N/A
1
N/A
N/A
1
CONDITION
nDIRECTION, Bit 0
Active low status indicating the direction of head movement. A logic “0” indicating inward direction a logic “1” outward.
Write Protect, Bit 1
Active high status of the WRITE PROTECT disk interface input. A logic “1” indicating that the disk is write protected.
The nWRITE PROTECT bit also depends upon the state of the Force Write Protect bits in the Force FDD Status
Change configuration register (see section CR17 on page 108).
Index, Bit 2
Active high status of the INDEX disk interface input.
nHEAD SELECT, Bit 3
Active low status of the HDSEL disk interface input. A logic “0” selects side 1 and a logic “1” selects side 0.
SMSC DS – FDC37N769
Page 18 of 137
Rev. 12/21/2000