FDC37M607 datasheet(13/182 Pages) SMSC

13 / 182 page

STATUS REGISTER A (SRA)

Address 3F0 READ ONLY

This register is read-only and monitors the state

the FINTR pin and several disk

interface pins in PS/2 and Model 30 modes. The

SRA can be accessed at any time when in PS/2

mode. In the PC/AT mode the data bus pins D0

- D7 are held in a high impedance state for a

read of address 3F0.

PS/2 Mode

BIT 0 DIRECTION

Active high status indicating the direction of

head movement. A logic "1" indicates inward

direction; a logic "0" indicates outward direction.

BIT 1 nWRITE PROTECT

Active low status of the WRITE PROTECT disk

interface input. A logic "0" indicates that the disk

is write protected.

BIT 2 nINDEX

Active low status of the INDEX disk interface

input.

BIT 3 HEAD SELECT

Active high status of the HDSEL disk interface

input. A logic "1" selects side 1 and a logic "0"

selects side 0.

BIT 4 nTRACK 0

Active low status of the TRK0 disk interface

input.

BIT 5 STEP

Active high status of the STEP output disk

interface output pin.

BIT 6 nDRV2

Active low status of the DRV2 disk interface

input pin, indicating that a second drive has

been installed.

BIT 7 INTERRUPT PENDING

Active high bit indicating the state of the Floppy

Disk Interrupt output.

INT

PENDING

nDRV2

STEP

nTRK0 HDSEL nINDX

nWP

DIR

RESET

COND.

N/A

FDC37M607 Datasheet(PDF) 13 Page - SMSC Corporation

FDC37M607 Datasheet(HTML) 13 Page - SMSC Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL