FDC37N869 View Datasheet(PDF) - SMSC -> Microchip

Part Name

Description

MFG CO.

FDC37N869

5V and 3.3V Super I/O Controller with Infrared Support for Portable Applications

SMSC -> Microchip 

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Table 10 - Drive Activation Values

DRIVE

DOR VALUE

0

1CH

1

2DH

2

4EH

3

8FH

Table 11 - Internal 2 Drive Decode: Drives 0 and 1

DIGITAL OUTPUT REGISTER

DRIVE SELECT OUTPUTS

(ACTIVE LOW)

MOTOR ON OUTPUTS

(ACTIVE LOW)

Bit 7 Bit 6 Bit 5 Bit 4 Bit1 Bit 0

nDS1 nDS0

nMTR1

nMTR0

X

X

X

1

0

0

1

0

nBIT 5

nBIT 4

X

X

1

X

0

1

0

1

nBIT 5

nBIT 4

X

1

X

X

1

0

1

1

nBIT 5

nBIT 4

1

X

X

X

1

1

1

1

nBIT 5

nBIT 4

0

0

0

0

X

X

1

1

nBIT 5

nBIT 4

TAPE DRIVE REGISTER (TDR)

The Tape Drive register (Base Address + 3) is included for 82077 software compatibility and allows the user to

assign tape support to a particular drive during initialization. Any future reference to that drive automatically invokes

tape support. The Tape Select bits TDR.[1:0] determine the tape drive number. Table 12 illustrates the Tape Select

bit encoding. Note that drive 0 is the boot device and cannot be assigned tape support.

The encoding of the TDR depends on the Floppy mode (see section Floppy Modes on page 17). The TDR is

unaffected by a software reset.

Table 12 - Tape Select Bits

TAPE SEL1

(TDR.1)

TAPE SEL0

(TDR.0)

DRIVE

SELECTED

0

0

NONE

0

1

1

1

0

2

1

1

3

Normal Floppy Mode

In Normal mode the TDR contains only bits 0 and 1 (Table 13). During a read in Normal mode TDR bits 2 - 7 are

high impedance. The Tape Select Bits are Read/Write.

TDR

Table 13 - TDR Normal Floppy Mode

DB7

DB6

DB5

DB4

DB3

DB2

Tri-state Tri-state Tri-state Tri-state Tri-state Tri-state

DB1

Tape

Sel1

DB0

Tape

Sel0

SMSC DS – FDC37N869

Page 24

Rev. 11/09/2000

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