scn68652 NXP Semiconductors, scn68652 Datasheet - Page 19

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

Philips Semiconductors
TIMING DIAGRAMS
1995 May 01
Multi-protocol communications controller (MPCC)
NOTES:
1. TxBE goes low relative to the falling edge of DBEN corresponding to loading TDSR
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.
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
dropped.
(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.
DBEN
TxSO
TxBE
TxBE
DBEN
TxC
TxE
TxA
TxSO
TxE
TxA
TxC
(Continued)
1
2
3
LOAD LAST CHAR
LOAD LAST CHAR
NEXT TO LAST CHAR
NEXT TO LAST CHAR
TRANSMIT TIMING – END OF BCP MESSAGE
SET TEOM
SET TEOM
TRANSMIT – END OF BOP MESSAGE
Figure 13. Timing Diagrams (cont.)
Figure 14. Timing Diagrams (cont.)
LAST CHAR
LAST CHAR
H/L
. It goes high one TxC before character transmission begins and also when TxA has been
19
RESET TEOM
CRC
CRC
1
RESET TEOM
FLAG
SCN2652/SCN68652
MARK
MARK
Product specification
SD00068
SD00069