UPD72871F1 datasheet(13/48 Pages) NEC

13 / 48 page

Preliminary Data Sheet S13925EJ2V0DS00

µµµµPD72870,72871

1. PIN FUNCTIONS

1.1 PCI/Cardbus Interface Signals: (52 pins)

(1/2)

Pin No.

Name

I/O

LQFP

FPBGA

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

11-14,

16-19,

24-27,

29,30,32,

33,49,50,

52,53,

55-58,

61-64,

66-69

E1,E2,

F1,F2,

G1,G2,

H1,H2,

K1,K2,

L1,L2,

M1,M2,

N1,N2,

R5-R12,

T5-T12

PCI/Cardbus

5/3.3

PCI Multiplexed Address and Data

CBE0-CBE3

22,35,47,

J2,P2,P9,

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.

UPD72871F1 Datasheet(PDF) 13 Page - NEC

UPD72871F1 Datasheet(HTML) 13 Page - NEC

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