scn68652ac2n40 NXP Semiconductors, scn68652ac2n40 Datasheet - Page 10

• Manufacturer Part Number: scn68652ac2n40
• Description: Scn2652/scn68652 Multi-protocol Communications Controller Mpcc
• Manufacturer: NXP Semiconductors

Philips Semiconductors
1995 May 1
Multi-protocol communications controller (MPCC)
*
GA will be transmitted if TGA is set together with TEOM.
SHOULD LOAD
PROCESSOR
(PROCESSOR MAY
SET TABORT, TGA,
TxU = 1, TERR = 1
TxDB WITH NEXT
(PROCESSOR SHOULD
RESET TEOM AND SET
TxDB AND
ON UNDERRUN:
TSOM = 0)
SHOULD LOAD
AS REQUIRED)
TxBE = 1
TSOM OR DROP TxE)
(PROCESSOR
(PROCESSOR
DATA CHAR)
SET TSOM)
TxBE = 1
SHOULD
TxBE = 1
TSOM = 1
TxA = 1
TxA = 0
TxE = 1
A
INITIALIZE PCSAR, PCR, TDSR
SERIALIZE DATA CHARACTER
B
NO
TRANSMIT FLAG ON TxSO*
IN TxDB, ZERO INSERTION,
TRANSMIT ACCUMULATED
INVERTED REMAINDER
FCS (IF SPECIFIED) AS
ACCUMULATE CRC IF
Figure 6. BOP Transmit
TRANSMIT ON TxSO
SPECIFIED BY ECM,
TRANSMIT FLAG
TxSO = MARK
ON TxSO
TABORT
UNDER
TSOM
TSOM
TxE =
RUN?
TEOM
TEOM
TSOM
= 0?
= 1?
= 1?
= 0?
= 1?
TxE
= 0?
1?
A
YES
NO
NO
NO
YES
YES
YES
YES
10
YES
YES
NO
NO
YES
H
NO
TxSO = ABORT = 11111111 IF IDLE = 0
NO
FLAG = 01111110 IF IDLE = 1
B
(PROCESSOR MUST CLEAR
TABORT/GA IN RESPONSE
TO TxBE = 1)
NO
TxSO = ABORT IF IDLE = 0
FLAG IF IDLE = 1
TSOM
= 1?
B
SCN2652/SCN68652
YES
Product specification
SD00063