CS5530A datasheet(61/259 Pages) NSC

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Functional Description (Continued)

3.4.1.7

Save-to-Disk/Save-to-RAM

This is a derivative of the Off state. The processor and the

CS5530A have the capability to save their complete state.

This stateinformation canbesaved to a harddiskorto

RAM and the system can be turned off. When powered

back on, the system can be returned exactly back to the

state it was in when the save process began. This means

that the system does not have to be rebooted in the tradi-

tional sense. In both cases, precautions must be taken in

the system design to make sure that there is sufficient

space on the hard drive or RAM to store the information. In

the case of the RAM, it must also be powered at all times

and can not be corrupted when the system is powered off

and back on.

The PC/AT compatible floppy port is not part of the

CS5530A. If a floppy is attached on the ISA bus in a

SuperI/O or by some other means, some of the FDC regis-

ters are shadowed in the CS5530A because they cannot

be safely read. The FDC registers are shown in Table 3-15.

Additional shadow registers for other functions

are

described in:

• Table 3-40 "DMA Shadow Register" on page 96

• Table 3-42 "PIT Shadow Register" on page 98

• Table 3-45 "PIC Shadow Register" on page 100

• Table 3-53 "Real-Time Clock Registers" on page 107

Table 3-15. Power Management Shadow Registers

Bit

Description

F0 Index B4h

Floppy Port 3F2h Shadow Register (RO)

Reset Value = xxh

7:0

Floppy Port 3F2h Shadow (Read Only): Last written value of I/O Port 3F2h. Required for support of FDC power ON/OFF

and Save-to-Disk/RAM coherency.

This register is a copy of an I/O register which cannot safely be directly read. Value in register is not deterministic of when

the register is being read. It is provided here to assist in a Save-to-Disk operation.

F0 Index B5h

Floppy Port 3F7h Shadow Register (RO)

Reset Value = xxh

7:0

Floppy Port 3F7h Shadow (Read Only): Last written value of I/O Port 3F7h. Required for support of FDC power ON/OFF

and Save-to-Disk/RAM coherency.

This register is a copy of an I/O register which cannot safely be directly read. Value in register is not deterministic of when

the register is being read. It is provided here to assist in a Save-to-Disk operation.

F0 Index B6h

Floppy Port 1F2h Shadow Register (RO)

Reset Value = xxh

7:0

Floppy Port 1F2h Shadow (Read Only): Last written value of I/O Port 1F2h. Required for support of FDC power ON/OFF

and Save-to-Disk/RAM coherency.

This register is a copy of an I/O register which cannot safely be directly read. Value in register is not deterministic of when

the register is being read. It is provided here to assist in a Save-to-Disk operation.

F0 Index B7h

Floppy Port 1F7h Shadow Register (RO)

Reset Value = xxh

7:0

Floppy Port 1F7h Shadow (Read Only): Last written value of I/O Port 1F7h. Required for support of FDC power ON/OFF

and Save-to-Disk/RAM coherency.

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