37C67X Ver la hoja de datos (PDF) - SMSC -> Microchip

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37C67X

Enhanced Super I/O Controller with Fast IR

SMSC -> Microchip 

CONFIGURATION CONTROL REGISTER (CCR)

Address 3F7 WRITE ONLY

PC/AT and PS/2 Modes

7

6

5

4

3

2

1

0

DRATE DRATE

SEL1 SEL0

RESET N/A N/A N/A N/A N/A N/A

1

0

COND.

BIT 0 and 1 DATA RATE SELECT 0 and 1

These bits determine the data rate of the floppy

controller. See Table 11 for the appropriate

values.

PS/2 Model 30 Mode

BIT 2 - 7 RESERVED

Should be set to a logical "0"

7

6

5

4

3

2

1

0

NOPREC DRATE DRATE

SEL1 SEL0

RESET N/A N/A N/A N/A N/A

N/A

1

0

COND.

BIT 0 and 1 DATA RATE SELECT 0 and 1

These bits determine the data rate of the floppy

controller. See Table 11 for the appropriate

values.

BIT 2 NO PRECOMPENSATION

This bit can be set by software, but it has no

functionality. It can be read by bit 2 of the DSR

when in Model 30 register mode. Unaffected by

software reset.

BIT 3 - 7 RESERVED

Should be set to a logical "0"

Table 12 shows the state of the DENSEL pin.

The DENSEL pin is set high after a hardware

reset and is unaffected by the DOR and the

DSR resets.

29

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