Z80C30 Datasheet, PDF (35/96 Pages) Zilog, Inc. – CMOS SCC SERIAL COMMUNICATIONS CONTROLLER

=&=& &026 6&&
6HULDO &RPPXQLFDWLRQV &RQWUROOHU

Start
Parity
Stop
Marking Line
Data
Data
Data
Asynchronous
SYNC
Data
SYNC
SYNC
Signal
Data
Monosync
Bisync
Data
CRC1
Data
CRC1
Data
Data
CRC1
External Sync
Flag
Address
Information
Information
SDLC/HDLC/X.25
CRC1
)LJXUH  6RPH 6&& 3URWRFROV
Marking Line
CRC2
CRC2
CRC2
CRC2
Flag
$V\QFKURQRXV 0RGHV
6HQG DQG 5HFHLYH LV DFFRPSOLVKHG LQGHSHQGHQWO\ RQ HDFK FKDQQHO
ZLWK ILYH WR HLJKW ELWV SHU FKDUDFWHU SOXV RSWLRQDO HYHQ RU RGG SDULW\
7KH WUDQVPLWWHUV FDQ VXSSO\ RQH RQHDQGDKDOI RU WZR VWRS ELWV
SHU FKDUDFWHU DQG FDQ SURYLGH D EUHDN RXWSXW DW DQ\ WLPH 7KH
UHFHLYHU EUHDNGHWHFWLRQ ORJLF LQWHUUXSWV WKH &38 ERWK DW WKH VWDUW
DQG DW WKH HQG RI D UHFHLYHG EUHDN 5HFHSWLRQ LV SURWHFWHG IURP
VSLNHV E\ D WUDQVLHQW VSLNHUHMHFWLRQ PHFKDQLVP WKDW FKHFNV WKH
VLJQDO RQHKDOI D ELW WLPH DIWHU D /RZ OHYHO LV GHWHFWHG RQ WKH
UHFHLYH GDWD LQSXW 5['$ RU 5['% SLQV ,I WKH /RZ GRHV QRW SHU
VLVW D WUDQVLHQW WKH FKDUDFWHU DVVHPEO\ SURFHVV GRHV QRW VWDUW
)XQFWLRQDO 'HVFULSWLRQ
36