SCD1284 datasheet(128/176 Pages) INTEL

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CD1284 — IEEE 1284-Compatible Parallel Interface Controller

128

Datasheet

7.4.5

Channel Option Register 5

7.4.6

Local Interrupt Vector Register

The LIVR is used only during hardware-activated service-acknowledge cycles. Host software

loads desired information into the most-significant five bits; the least-significant three bits are not

used. When the CD1284 is setting up a service request, it overlays the five most-significant bits of

the LIVR into appropriate interrupt vector register (RIVR, TIVR, PIVR, and MIVR) and sets the

least-significant three bits as required for the service request vector type. (See RIVR, TIVR, PIVR,

and MIVR descriptions). Refer to Section 7.7.5 on page 138 for a more detailed description of this

Access: Read/Write

8-Bit Hex Address: 1F

Default Value: 00

Bit 7Bit 6Bit 5Bit 4Bit 3

Bit 2Bit 1

Bit 0

ISTRIP

LNE

CMOE

EBD

ONLCR

OCRNL

Bit

Description

ISTRIP: This bit enables stripping of the most-significant bit (bit 7) on all received characters. ‘1’ enables the

function.

LNext Enable: When this bit is set, characters following an LNext character (as programmed by the LNC

Character Matching on Error: If this bit is set, character matching occurs on both good and error characters.

If the bit is cleared, matching occurs on good characters only.

4:3

These bits must always be ‘0’.

End of Break Detect: If this bit is set, the CD1284 after detecting and reporting a line-break condition,

searches for the end of a break and reports it by an exception service request with the End of Break status in

the RDSR (see RDSR description Section 7.2.4 on page 115).

1:0

Carriage Return (CR) and New Line (NL) Processing – Transmit: These two bits define any actions taken on

characters in the transmit data stream.

Access: Read/Write

8-Bit Hex Address: 18

Default Value: 00

Bit 7Bit 6

Bit 5

Bit 4Bit 3Bit 2Bit 1Bit 0

XXXXX

IT2

IT1

IT0

ONLCR

OCRNL

Action

No action.

Transmit CR changed to NL.

Transmit NL changed to CRNL.

Transmit CR changed to NL; NL changed to CRNL.

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