PC87782 datasheet(11/17 Pages) NSC

Part #	PC87782

Description	CompactRISC Intelligent System Management Controller

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Manufacturer	NSC [National Semiconductor (TI)]

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VREF

Analog Input

1

Reference Voltage for the on-chip A/D and D/A circuits.

An External Reference voltage should be connected to

this input.

WAIT

TTL

N/A

1

WAIT signal for inserting Wait states into accesses to

slow off-chip memories or peripherals.

Table 3 Input Pins

Signal

Type

Pin Number

No. of

Sig Pins

Function

100-pin

160-pin

Table 4 Output Pins

Signal

Type

Pin Number

No. of Sig

Pins

Function

100-pin

160-pin

32KX2

OSCOUT

1

32.768 KHz Crystal Oscillator Interface output to

crystal

CLK

CM

1

Processor System Clock

DAOUT

Analog out

1

Digital to Analog Converter Output.

IRQA, IRQB

CM

2

Interrupts from Host Interface channels A and B.

NTEST

CM

1

NAND Test Output.

TXD0-3

MII Out

4

MII Output data.

TX_EN

MII Out

1

MII Transmit Enable

A0-15

CM

N/A

16

Address A0 through A15. CR16A address to memory.

BST(2,1,0)

CM

N/A

3

Bus Status bits 0 through 2

PFS

CM

N/A

1

Pipe Flow Status.

PLI

CM

N/A

1

Pipe Long Instruction Status.

RD

CM

N/A

1

Output Enable.

SEL0

CM

N/A

1

Zone Select 0. Chip-select signal for the External

Memory.

SEL1

CM

N/A

1

Zone Select 1. Used to select the off-chip Base

Memory.

SELIO

CM

N/A

1

Chip-select signal for the I/O Expansion.

WR(1,0)

CM

N/A

2

Write control for bytes 0 and 1

Table 5 Input/Output Pins

Signal

Type

Pin Number

No. of

Sig Pins

Function

100-pin

160-pin

HD0-7

CMHD2-TTL

8

Bi-directional Data bus used to interface the PC87782

to the peripheral data bus of a host.

PB0-7

CM-PU-

Schmitt

8

Port B, bits 0 through 7.

PC0-7

CM-PU-

Schmitt

8

Port C, bits 0 through 7.

PF0-7

CM-PU-TTL

8

Port F, bits 0 through 7

PI0-7

Analog I/O

CM-PU-

Schmitt

8

Analog inputs to the A/D converter. PI0 and PI1 can

be analog feedback outputs from the Op-Amps. All

Port I pins can be digital inputs or outputs.

PL0-7

CM-PU-

Schmitt

8

Port L, bits 0 through 7

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