PC97307 datasheet(116/218 Pages) NSC

116 / 218 page

116

Parallel Port (Logical Device 4)

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6.3.4

SPP or EPP Control Register (CTR), Offset 02h

This control port is read or write. A write operation to it sets

the state of four pins on the 25-pin D-shell connector, and

controls both the parallel port interrupt enable and direction.

FIGURE 6-6. SPP or EPP CTR Register Bitmap

The bits of this register have the identical function in EPP

modes as in SPP modes. See Section 6.2.4 for a detailed

description of each bit.

6.3.5

EPP Address Register (ADDR), Offset 03h

This port is added in EPP modes to enhance system

throughput by enabling registers in the remote device to be

directly addressed by hardware.

This port can be read or written. Writing to it initiates an EPP

device or register selection operation.

FIGURE 6-7. EPP ADDR Register Bitmap

76543210

Reset

Required

SPP or EPP Control

Offset 02h

Printer Initialization Control

Interrupt Enable

Direction Control

Reserved

Data Strobe Control

Automatic Line Feed Control

Parallel Port Input Control

76543210

Reset

Required

EPP Address

Offset 03h

EPP Device or

Address Bits

6.3.6

EPP Data Register 0 (DATA0), Offset 04h

DATA0 is a read/write register. Accessing it initiates device

read or write operations of bits 7 through 0.

FIGURE 6-8. EPP DATA0 Register Bitmap

6.3.7

EPP Data Register 1 (DATA1), Offset 05h

DATA1 is only accessed to transfer bits 15 through 8 of a

16/32-bit read or write to EPP Data Register 0 (DATA0).

FIGURE 6-9. EPP DATA1 Register Bitmap

6.3.8

EPP Data Register 2 (DATA2), Offset 06h

This is the third EPP data register. It is only accessed to

transfer bits 23 through 16 of a 32-bit read or write to EPP

Data Register 0 (DATA0).

FIGURE 6-10. EPP DATA2 Register Bitmap

76543210

Reset

Required

EPP Data Register 0

(DATA0)

Offset 04h

EPP Device

Read or Write Data

76543210

Reset

Required

EPP Data Register 1

(DATA1)

Offset 05h

D10

D12

D13

D14

D15

D11

EPP Device

Read or Write Data

76543210

Reset

Required

EPP Data Register 2

(DATA2)

Offset 06h

D18

D20

D21

D22

D23

D16

D17

D19

EPP Device

Read or Write Data

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