FDC37C78-HT datasheet(68/82 Pages) MICROCHIP

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Table 40 - CR07

BIT NO.

BIT NAME

DESCRIPTION

0,1

Floppy Boot

This bit is used to define the boot floppy.

0 = Drive A (default)

1 = Drive B

Media ID0

Polarity

0 = Non-invert

1 = Invert

Media ID1

Polarity

0 = Non-invert

1 = Invert

4:6

Reserved

Read as 0.

Floppy Disk

Enable

This bit controls the AUTOPOWER DOWN feature of the Floppy

Disk. The function is:

0 = Auto powerdown disabled (default)

1 = Auto powerdown enabled

This bit is reset to the default state by POR or a hardware reset.

CR08

This register can only be accessed in the Configuration Mode and after the CSR has been initialized to

08H.

The default value of this register after power up is 00H. This register is read only.

CR09

This register can only be accessed in the Configuration Mode and after the CSR has been initialized to

09H. The default value of this register after power up is 00H. This register is read only.

CR0A

This register can only be accessed in the Configuration Mode and after the CSR has been initialized to

0AH. The default value of this register after power up is 00H. This register is read only.

CR0B

This register can only be ac1cessed in the Configuration Mode and after the CSR has been initialized

0BH. The default value of this register after power up is 00H. This register indicates the data rate

table used for each drive. Refer to CR1F for Drive Type register.

Table 41 - CR0B

FDD3

FDD2

FDD1

FDD0

DRT1

DRT0

DRT1

DRT0

DRT1

DRT0

DRT1

DRT0

CR0C

This register can only be accessed in the Configuration Mode and after the CSR has been initialized to

0CH. The default value of this register after power up is 00H. This register is reserved.

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