SCD1284 datasheet(127/176 Pages) INTEL

127 / 176 page

IEEE 1284-Compatible Parallel Interface Controller — CD1284

Datasheet

127

Bit

Description

7:5

Carriage Return (CR) and New Line (NL) Processing: These three bits define the way that the CD1284

processes received CR and NL characters (x’0D and x’0A). The following table shows the actions performed:

4:3

Break Processing: The CD1284 can handle received break characters in three ways:

2:0

Parity (P), Framing (F), and Overrun (O) Error Special Processing: As with break characters, the CD1284

can treat error characters in several different ways, if enabled:

IGNCR

ICRNL

INLCR

Action

No action.

Received NL changed to CR.

Received CR changed to NL.

Received CR changed to NL; NL changed to CR.

Received CR discarded.

Received CR discarded; NL changed to CR.

Received CR discarded.

Received CR discarded; NL changed to CR.

IGNBRK

−BRKINT

Break Action

Received break generates an exception service request. End-

of-Break also generates an exception service request if EBD is

enabled in COR5.

Received break treated as a good NULL character.

Not used.

Received break discarded.

PEH[2]

PEH[1]

PEH[0]

Action

Received P/F/O error characters treated as exception data.

Received P/F/O error characters treated as good data.

Received P/F/O error characters discarded.

Received P/F/O error characters replaced with good NULL

characters.

Received P/F/O error characters are replaced with the two

character sequence x’FF-NULL-character. Good x’FF

characters are replaced with the two character sequence

x’FF-x’FF.

Not used.

SCD1284 Datasheet(PDF) 127 Page - Intel Corporation

SCD1284 Datasheet(HTML) 127 Page - Intel Corporation

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