PC87351 datasheet(16/86 Pages) NSC

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1.0 Signal/Pin Connection and Description (Continued)

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1.3

PIN MULTIPLEXING

There are three categories of pins with multiple names: Multiplexed (MUX), Multiple Mode (MM) and Parallel Port MUX

(PPM). See Section 1.2 for descriptions of these categories. All the multiplexing options in the MUX category and their as-

sociated setup configuration are described in Table 1-3. A multiplexing option may be chosen on one pin only per group.

WGATE

FDC

1.4.3

OD24, O4/24

11.1.10, 11.1.9

PPM

FDC

1.4.3

INT

11.1.7

PPM

WRITE

See STB/WRITE

Table 1-3. Pin Multiplexing Conﬁguration

Default

Alternate

Signal

I/O

Conﬁguration

Signal

I/O

Conﬁguration

34 PCICLK

SIOCF2, Bit 0 = 0

IRQ1

I/O SIOCF2, Bit 0 = 1

35 SERIRQ

I/O SIOCF2, Bit 0 = 0

IRQ3

I/O SIOCF2, Bit 0 = 1

37 GPIO10

I/O SIOCF2, Bit 0 = 0

IRQ4

I/O SIOCF2, Bit 0 = 1

38 GPIO11

IRQ5

39 GPIO12

IRQ6

40 GPIO13

IRQ7

43 GPIO16

IRQ12

41 GPIO14

I/O

SIOCF2, Bits 2-1 = 00

or Bits 2-0 = 011

IRQ9

I/O SIOCF2, Bits 2-0 = 010

IRRX2/IRSL0

I/O SIOCF2, Bits 2-1 = 10

P17

I/O SIOCF2, Bits 2-1 = 11

42 GPIO15

I/O

SIOCF2, Bits 4-3 = 00

or Bits 4-3, 0 = 011

IRQ11

SIOCF2, Bits 4-3, 0 = 010

P12

I/O SIOCF2, Bits 4-3 = 10

P17

I/O SIOCF2, Bits 4-3 = 11

98 KBRST

I/O SIOCF2, Bits 6-5 = 01

GPIO17

I/O SIOCF2, Bits 6-5 = 00

P12

I/O SIOCF2, Bits 6-5 = 10

PNF

I/O SIOCF2, Bits 6-5 = 11

99 GA20

I/O SIOCF2, Bit 7 = 1

GPIO20

I/O SIOCF2, Bit 7 = 0

Table 1-2. Signal/Pin Directory (Continued)

Signal

Pin/s

Functional Group

DC Characteristics

Multiplexed

Name

Section

Buffer Type

Section

PC87351 Datasheet(PDF) 16 Page - National Semiconductor (TI)

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