SCN2652AC2N40 查看數據表（PDF） - Philips Electronics

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产品描述 (功能)

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SCN2652AC2N40

Multi-protocol communications controller(MPCC)

Philips Electronics 

Philips Semiconductors

Multi-protocol communications controller (MPCC)

Product specification

SCN2652/SCN68652

TIMING DIAGRAMS (Continued)

TxC

TRANSMIT – END OF BOP MESSAGE

TxSO NEXT TO LAST CHAR

LAST CHAR

TxBE1

LOAD LAST CHAR

DBEN

SET TEOM

TxE2

CRC

FLAG

MARK

RESET TEOM

TxA3

NOTES:

1. TxBE goes low relative to the falling edge of DBEN corresponding to loading TDSRH/L. It goes high one TxC before character transmission begins and also when TxA has been

dropped.

2. TxE can be dropped before resetting TEOM if TxBE (corresponding to the closing FLAG) is high. Alternatively TxE can remain high and a new message initiated.

3. TxA goes low after TxE has been dropped and 1 1/2 TxC’s after the last bit of the closing FLAG has been transmitted.

SD00068

Figure 13. Timing Diagrams (cont.)

TRANSMIT TIMING – END OF BCP MESSAGE

TxC

TxSO NEXT TO LAST CHAR

LAST CHAR

CRC1

MARK

TxBE

LOAD LAST CHAR

DBEN

SET TEOM

RESET TEOM

TxE

TxA

NOTE:

1. When SCN2652 generated CRC is not required. TEOM should only be set if SYNCs are to follow the message block. In that case, TxE should be dropped in response to TxBE

(which corresponds to the start of transmission of the last character). When CRC is required, TxE must be dropped before CRC transmission is complete. Otherwise, the contents

of TxDB will be shifted out on TxSO. This facilitates transmission of contiguous messages.

Figure 14. Timing Diagrams (cont.)

SD00069

1995 May 01

19

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