PC87317 datasheet(39/272 Pages) NSC

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Configuration

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2.4.6

Programmable Chip Select Configuration Data

This read/write register contains the data in the Program-

mable Chip Select Configuration register (see Section 2.10

"PROGRAMMABLE CHIP SELECT CONFIGURATION

REGISTERS" on page 42) indicated by the Programmable

Chip Select Configuration Index register at index 23h.

FIGURE 2-6. Programmable Chip Select Configuration

Data Register Bitmap

2.4.7

SuperI/O Configuration 3 Register (SIOC3)

This read/write register enables output-pin designation and

interrupt routing. It is reset by hardware to 00h.

FIGURE 2-7. SIOC3 Register Bitmap

Bit 0 - P16 or GPIO25 Pin Select

P16 is routed to I/O pin.

1: GPIO25 is routed to I/O pin. The KBC ﬁrmware

may write to P16 and read it back as if the pin exist

and left open. Upon reset, this bit is initialized to 0.

Bit 1 - P12 or CS0 Pin Select

P12 is routed to I/O pin.

1: CS0 is routed to I/O pin. The KBC ﬁrmware may

write to P12 and read it back as if the pin exist and

left open. Upon reset, this bit is initialized to 0.

Bit 2 - Reserved

Reserved.

Bit 3 - SCI Polarity Select

0: SCI interrupt is active low.

1: SCI interrupt is active high.

Bits 7-4 - SCI Plug-and-Play Select

SCI can be routed to one of the following ISA interrupts:

IRQ1, IRQ3-IRQ12, IRQ14-IRQ15.

For details on the SCI signal, refer to Chapter 4 on page 53.

TABLE 2-23. SCI Routing

Upon reset, these bits are initialized to 0000.

Disable means the SCI is not routed to any ISA interrupt.

Unpredictable results when invalid values are written.

2.4.8

PC97317 SRID Register

This read-only register holds the revision number of the

PC97317 chip. SRID is incremented on each tapeout.

FIGURE 2-8.

PC97317 SRID Register Bitmap

Data in a Programmable

76543210

Reset

Required

Programmable Chip Select

Index 24h

Configuration Data

Chip Select Configuration

Reserved

76543210

Reset

Required

SuperI/O Configuration 3

Index 25h

P16 or GPIO25 Select

P12 or CS0 Select

SCI Plug-and-Play Select

SCI Polarity Select

Bits

7 6 5 4

Interrupt

0 0 0 0

Disable

0 0 0 1

IRQ1

0 0 1 0

Invalid

0 0 1 1

IRQ3

0 1 0 0

IRQ4

0 1 0 1

IRQ5

0 1 1 0

IRQ6

0 1 1 1

IRQ7

1 0 0 0

IRQ8

1 0 0 1

IRQ9

1 0 1 0

IRQ10

1 0 1 1

IRQ11

1 1 0 0

IRQ12

1 1 0 1

Invalid

1 1 1 0

IRQ14

1 1 1 1

IRQ15

76543210

Reset

Required

PC97317 SRID Register

Index 27h

Chip Revision ID

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