PC87351 datasheet(39/86 Pages) NSC

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2.0 Device Architecture and Configuration (Continued)

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2.7

PARALLEL PORT - LOGICAL DEVICE 1

2.7.1

General Description

The PC87351 Parallel Port device offers a wide range of operational configurations. It utilizes the most advanced protocols

in current use, while maintaining full backward compatibility to support existing hardware and software. It supports two Stan-

dard Parallel Port (SPP) modes of operation for parallel printer ports, two Enhanced Parallel Port (EPP) modes of operation,

and one Extended Capabilities Port (ECP) mode. This versatility is achieved by user software control of the mode in which

the device functions. The following table lists the Parallel Port Registers used in each mode of operation.

Note: The Parallel Port does not support zero wait states.

Table 2-11. Parallel Port Registers Classiﬁed by Mode

2.7.2

Configuration

1. These registers are extended, and not standard 1284 registers.

They are accessible only when enabled by bit 4 of the Parallel Port

Conﬁguration Register (see Section 2.7.3).

Offset

SPP

EPP

ECP

00h

DTR

DATAR (modes 0,1)

AFIFO (mode 3)

01h

STR

DSR

02h

CTR

DCR

03h

ADDR

04h

DATA0

05h

DATA1

06h

DATA2

07h

DATA3

400h

CFIFO (mode 2)

DFIFO (mode 3)

TFIFO (mode 6)

CNFGA (mode 7)

401h

CNFGB

402h

ECR

403h

EIR1

404h

EDR1

405h

EAR1

Index

Conﬁguration Register or Action

Type

Reset

30h Activate. See also bit 0 of the SIOCF1 Register.

R/W

00h

60h Base Address MSB Register. Bits 7-3 (for A15-11) are read only, 00000b.

R/W

02h

61h Base Address LSB Register. Bits 1 and 0 (for A1 and A0) are read only, 00b.

R/W

78h

70h Interrupt Number

R/W

07h

71h Interrupt Type

Bits 7-2 are read only.

Bit 1 is a read/write bit.

Bit 0 is read only. It reﬂects the interrupt type dictated by the Parallel Port operation

mode and conﬁgured by the Parallel Port Conﬁguration Register. This bit is set to 1

(level interrupt) in Extended Mode and cleared (edge interrupt) in all other modes.

R/W

02h

74h DMA Channel Select

R/W

04h

75h Report no second DMA assignment

04h

F0h Parallel Port Conﬁguration Register

R/W

F2h

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