CS5535 datasheet(322/555 Pages) NSC

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Revision 0.8

Floppy Port Register Descriptions (Continued)

5.7.1.3

Floppy Port 372h Shadow (FLPY_3F2_SHDW)

5.7.1.4

Floppy Port 377h Shadow (FLPY_377_SHDW)

MSR Address

51400032h

Type

Reset Value

xxh

FLPY_3F2_SHDW Register Map

76543

210

FLPY_PORT_372_VAL

FLPY_3F2_SHDW Bit Descriptions

Bit

Name

Description

7:0

FLPY_PORT_372

_VAL

Floppy Port Shadow Register Value Last Written to I/O Port 372h. Required for

support of FDC power ON/OFF and Zero Volt Suspend/Resume coherency.

This register is a copy of an I/O register that cannot safely be directly read. Value in reg-

ister is not deterministic of when the register is being read. It is provided here to assist

in a Save-to-Disk operation.

MSR Address

51400033h

Type

Reset Value

xxh

FLPY_377_SHDW Register Map

76543

210

FLPY_PORT_377_VAL

FLPY_377_SHDW Bit Descriptions

Bit

Name

Description

7:0

FLPY_PORT_377

_VAL

Floppy Port Shadow Register Value Last Written to I/O Port 377h. Required for

support of FDC power ON/OFF and Zero Volt Suspend/Resume coherency.

This register is a copy of an I/O register that cannot safely be directly read. Value in reg-

ister is not deterministic of when the register is being read. It is provided here to assist

in a Save-to-Disk operation.

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