FDC37C669TQFP Просмотр технического описания (PDF) - SMSC -> Microchip

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FDC37C669TQFP

PC 98/99 Compliant Super I/O Floppy Disk Controller with Infrared Support

SMSC -> Microchip 

STATUS REGISTER A (SRA)

Address 3F0 READ ONLY

This register is read-only and monitors the state of 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

7

6

5

4

3

2

1

0

INT

nDRV2 STEP nTRK0 HDSEL nINDX nWP DIR

PENDING

RESET

0

COND.

N/A

0

N/A

0

N/A N/A

0

BIT 0 DIRECTION

Active high status indicating the direction of head

movement. A logic "1" indicating inward direction a logic

"0" outward.

BIT 1 nWRITE PROTECT

Active low status of the WRITE PROTECT disk interface

input. A logic "0" indicating 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.

19

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