UPD72862 datasheet(8/36 Pages) NEC

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Data Sheet S14265EJ2V0DS00

µµµµPD72862

1. PIN FUNCTIONS

1.1 PCI Bus Interface Signals: (52 pins)

(1/2)

Name

I/O

Pin No.

IOL

Volts(V)

Function

PAR

I/O

PCI/Cardbus

5/3.3

Parity is even parity across AD0-AD31 and CBE0-CBE3. It is an

input when AD0-AD31 is an input; it is an output when AD0-AD31 is

an output.

AD0-AD31

I/O

2-5, 7, 8,

21-24,

27-30,

33-36,

39-42,

86-91,

93, 94,

98, 99

PCI/Cardbus

5/3.3

PCI Multiplexed Address and Data

CBE0-CBE3

9, 20,

32, 95

5/3.3

Command/Byte Enables are multiplexed Bus Commands & Byte

enables.

FRAME

I/O

PCI/Cardbus

5/3.3

Cycle Frame is asserted by the initiator to indicate the cycle

beginning and is kept asserted during the burst cycle.

If Cardbus mode (CARD_ON = 1), this pin is should be pulled up to

VDD.

TRDY

I/O

PCI/Cardbus

5/3.3

Target Ready indicates that the current data phase of the

transaction is ready to be completed.

IRDY

I/O

PCI/Cardbus

5/3.3

Initiator Ready indicates that the current bus master is ready to

complete the current data phase. During a write, its assertion

indicates that the initiator is driving valid data onto the data bus.

During a read, its assertion indicates that the initiator is ready to

accept data from the currently-addressed target.

REQ

PCI/Cardbus

5/3.3

Bus_master Request indicates to the bus arbiter that this device

wants to become a bus master.

GNT

5/3.3

Bus_master Grant indicates to this device that access to the bus

has been granted.

IDSEL

5/3.3

ID Select when actively driven, indicates that the IUHC is chip-

selected for configuration read/write transaction during the phase of

device initialization.

If Cardbus mode (CARD_ON = 1), this pin is should be pulled up to

VDD.

DEVSEL

I/O

PCI/Cardbus

5/3.3

Device Select when actively driven, indicates that the driving device

has decoded its address as the target of the current access.

STOP

I/O

PCI/Cardbus

5/3.3

PCI Stop when actively driven, indicates that the target is

requesting the current bus master to stop the transaction.

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