PC87365 datasheet(59/215 Pages) NSC

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2.0 Device Architecture and Configuration (Continued)

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2.11 PARALLEL PORT CONFIGURATION

2.11.1

General Description

The PC87365 Parallel Port supports all IEEE1284 standard communication modes: Compatibility (known also as Standard

or SPP), Bi-directional (known also as PS/2), FIFO, EPP (known also as Mode 4) and ECP (with an optional Extended ECP

mode).

The Parallel Port includes two groups of runtime registers, as follows:

• A group of 21 registers at first level offset, sharing 14 entries. Three of this registers (at offsets 403h, 404h and 405h)

are used only in the Extended ECP mode.

• A group of four registers, used only in the Extended ECP mode, accessed by a second level offset.

The desired mode is selected by the ECR runtime register (offset 402h). The selected mode determines which runtime reg-

isters are used and which address bits are used for the base address. See Tables 19 and 20 for a listing of all registers, their

offset addresses and the associated modes.

Table 19. Parallel Port Registers at First Level Offset

Table 20. Parallel Port Registers at Second Level Offset

Offset

Mnemonic

Mode(s)

Type

00h

DATAR

0,1

R/W

Data

AFIFO

ECP FIFO (Address)

DTR

R/W

Data (for EPP)

01h

DSR

0,1,2,3

Status

STR

Status (for EPP)

02h

DCR

0,1,2,3

R/W

Control

CTR

R/W

Control (for EPP)

03h

ADDR

R/W

EPP Address

04h

DATA0

R/W

EPP Data Port 0

05h

DATA1

R/W

EPP Data Port 1

06h

DATA2

R/W

EPP Data Port 2

07h

DATA3

R/W

EPP Data Port 3

400h

CFIFO

DFIFO

TFIFO

CNFGA

R/W

PP Data FIFO

ECP Data FIFO

Test FIFO

Conﬁguration A

401h

CNFGB

Conﬁguration B

402h

ECR

0,1,2,3

R/W

Extended Control

403h

EIR1

1. These registers are extended to the standard IEEE1284 registers. They are accessi-

ble only when enabled by bit 4 of the Parallel Port Conﬁguration register (see Section

2.11.3).

0,1,2,3

R/W

Extended Index

404h

EDR1

0,1,2,3

R/W

Extended Data

405h

EAR1

0,1,2,3

R/W

Extended Auxiliary Status

Offset

Mnemonic

Type

00h

Control0

R/W

Extended Control 0

02h

Control2

R/W

Extended Control 1

04h

Control4

R/W

Extended Control 4

05h

PP Confg0

R/W

Conﬁguration 0

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