SCN2652 データシートの表示（PDF） - Philips Electronics

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SCN2652

Multi-protocol communications controller(MPCC)

Philips Electronics 

Philips Semiconductors

Multi-protocol communications controller (MPCC)

Product specification

SCN2652/SCN68652

INITIALIZE PCSAR, PCR, TDSRH

A

TxSO = MARK

(PROCESSOR MUST CLEAR

TABORT/GA IN RESPONSE

TO TxBE = 1)

TSOM = 1

TxE = 1

TxA = 1

TxBE = 1

PROCESSOR

SHOULD LOAD

TxDB AND

TSOM = 0)

(PROCESSOR MAY

SET TABORT, TGA,

AS REQUIRED)

ON UNDERRUN:

TxU = 1, TERR = 1

(PROCESSOR

SHOULD

SET TSOM)

TxBE = 1

(PROCESSOR

SHOULD LOAD

TxDB WITH NEXT

DATA CHAR)

TxBE = 1

TSOM

TxE =

1?

NO

B

YES

TRANSMIT FLAG

ON TxSO

TSOM

NO

= 0?

YES

TABORT

= 1?

YES TxSO = ABORT = 11111111 IF IDLE = 0

FLAG = 01111110 IF IDLE = 1

NO

UNDER

RUN?

YES

NO

SERIALIZE DATA CHARACTER

IN TxDB, ZERO INSERTION,

ACCUMULATE CRC IF

SPECIFIED BY ECM,

TRANSMIT ON TxSO

TEOM

NO

= 1?

YES

TRANSMIT ACCUMULATED

FCS (IF SPECIFIED) AS

INVERTED REMAINDER

TxSO = ABORT IF IDLE = 0

FLAG IF IDLE = 1

NO

TSOM

= 1?

YES

B

TRANSMIT FLAG ON TxSO*

(PROCESSOR SHOULD

RESET TEOM AND SET

TSOM OR DROP TxE)

TxA = 0

*GA will be transmitted if TGA is set together with TEOM.

TEOM

NO

= 0?

YES

TSOM

= 1?

B

YES

NO

TxE

NO

= 0?

YES

A

Figure 8. BOP Transmit

SD00063

1995 May 01

11

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