PC97338 datasheet(68/221 Pages) NSC

68 / 221 page

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Bit 0 - Select DRATE1, MSEN1, CS0, SIRQI2 or

DACK3

When the pin is assigned for DACK3, MSEN1 is

masked to 1.

0 - DRATE1, MSEN1, CS0 or SIRQI2 may use

the pin, according to bits 7 and 6 of the SIRQ2

1 - DACK3 may use the pin.

Bit 1 - Select DRV2, PNF, DR23, SIRQI3 or

IRSL2/

ID2

DRV2 and PNF are masked to 1, when the pin is

assigned for IRSL2.

0 - DRV2, PNF, DR23 or SIRQI3 may use the pin,

according to bits 7 and 6 of SIRQ3 register.

1 - IRSL2

/ID2 may use the pin (ID2 is only in

PC97338).

Bit 2 - Select MTR1, IDLE or IRSL2/

ID2

0 - MTR1 or IDLE may use the pin, according to

bit 4 of PMC register.

1 - IRSL2

/ID2 uses the pin (ID2 is only in

PC97338).

Bit 3 - Select IRQ12, IRRX2, IRSL0/

ID0

This bit is ignored in 11-bit address mode.

0 - IRQ12 may use the pin.

1 - IRRX2 or IRSL0

/ID0 may use the pin, accord-

ing to SCC2 extended registers (

ID0 is only in

PC97338).

Bit 7-4 - Reserved

These bits are reserved.

2.3.38 Clock Control Register

(CLK), Index 51h

Upon power on (when VDD is applied), all bits of this

This register is not reset by the MR pin.

FIGURE 40. CLK Register Bitmap

Bits 1,0 - SuperI/O Chip Clock Source

These bits define the clock source for the SuperI/O

chip that is fed via the X1 pin.

Upon power on, these bits are read or write. Once

they are written, they become read-only bits.

00 - The clock source is the on-chip clock multi-

plier fed by 14.318 MHz.

01 - The clock source is the on-chip clock multi-

plier fed by 24 MHz.

10 - The clock source is 48 MHz.

11 - Reserved.

Bit 2 - Clock Multiplier Enable

Bits 2 and 3 of the PCR register may affect this bit.

0 - On chip clock multiplier is disabled.

1 - On chip clock multiplier is enabled.

Bit 3 - Valid Multiplier Clock Status

Read only.

0 - On-chip clock (clock multiplier output) is fro-

zen.

1 - On-chip clock (clock multiplier output) is sta-

ble and toggling.

Bits 7-4 - Reserved

These bits are reserved.

2.3.39 Manufacturing Test Register

(MTEST), Index 52h

This register controls manufacturing tests. It exist only

in the PC97338 version.

543

Reset

Required

Index 51h

Clock Control

Reserved

Clock Multiplier Enable

Valid Clock Multiplier Status

Reserved

SuperI/O Chip

Clock Source

PC97338 датащи(PDF) 68 Page - National Semiconductor (TI)

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