Z85230 Datasheet, PDF (24/120 Pages) Zilog, Inc. – ENHANCED SERIAL COMMUNICATIONS CONTROLLER

==
(QKDQFHG 6HULDO &RPPXQLFDWLRQV &RQWUROOHU

$V\QFKURQRXV 0RGHV
7KH (6&& KDV VLJQLILFDQW LPSURYHPHQWV RYHU WKDW RI WKH VWDQGDUG 6&& 7KH DGGL
WLRQ RI WKH GHHSHU GDWD ),)2V SURYLGH JUHDWHU SURWHFWLRQ DJDLQVW XQGHUUXQV DQG
RYHUUXQV DV ZHOO DV PRUH HIILFLHQW XVH RI EXV EDQGZLGWK 7KH GHHSHU GDWD ),)2V
DUH DFFHVVLEOH UHJDUGOHVV RI WKH SURWRFRO XVHG 7KH\ GR QRW QHHG WR EH HQDEOHG
)RU PRUH GHWDLOV RQ WKHVH LPSURYHPHQWV 6HH ³== (QKDQFHPHQWV´
RQ SDJH 
6HQG DQG 5HFHLYH DOORZ ILYH WR HLJKW ELWV SHU FKDUDFWHU SOXV RSWLRQDO (YHQ RU 2GG
SDULW\ 7KH WUDQVPLWWHUV FDQ VXSSO\ RQH RQHDQGDKDOI RU WZR VWRS ELWV SHU FKDU
DFWHU DQG FDQ SURYLGH EUHDN LQGLFDWLRQ 7KH UHFHLYHU EUHDNGHWHFWLRQ ORJLF LQWHU
UXSWV WKH &38 ERWK DW WKH VWDUW DQG DW WKH HQG RI D UHFHLYHG EUHDN 5HFHSWLRQ LV
SURWHFWHG IURP VSLNHV E\ VWDUWELW YDOLGDWLRQ WKDW GHOD\V WKH VLJQDO IRU D OHQJWK RI
WLPH HTXDO WR RQH KDOI WKH WLPH SHULRG UHTXLUHG WR SURFHVV RQH ELW RI GDWD DIWHU D
/RZ OHYHO LV GHWHFWHG RQ WKH UHFHLYH GDWD LQSXW 5['$ RU 5['% SLQV ,I WKH /RZ
GRHV QRW SHUVLVW WKDW LV D WUDQVLHQW WKH FKDUDFWHU DVVHPEO\ SURFHVV GRHV QRW
VWDUW
)UDPLQJ HUURUV DQG RYHUUXQ HUURUV DUH GHWHFWHG DQG EXIIHUHG WRJHWKHU ZLWK WKH
FKDUDFWHU DW ZKLFK WKH\ RFFXU 9HFWRUHG LQWHUUXSWV DOORZ IDVW VHUYLFLQJ RI HUURU FRQ
GLWLRQV )XUWKHUPRUH D EXLOWLQ FKHFNLQJ SURFHVV DYRLGV WKH LQWHUSUHWDWLRQ RI D
IUDPLQJ HUURU DV D QHZ VWDUW ELW $ IUDPLQJ HUURU UHVXOWV LQ WKH DGGLWLRQ RI D GHOD\ RI
RQH KDOI WKH DPRXQW RI WLPH UHTXLUHG WR SURFHVV RQH ELW RI GDWD DW WKH SRLQW DW
ZKLFK WKH VHDUFK IRU WKH QH[W VWDUW ELW EHJLQV 7UDQVPLW DQG 5HFHLYH FORFNLQJ FDQ
EH VHOHFWHG IURP DQ\ RI VHYHUDO VRXUFHV ,Q DV\QFKURQRXV PRGHV WKH 6<1& SLQ
PD\ EH SURJUDPPHG DV DQ LQSXW ZLWK LQWHUUXSW FDSDELOLW\
6\QFKURQRXV 0RGHV
7KH (6&& VXSSRUWV ERWK E\WHRULHQWHG DQG ELWRULHQWHG V\QFKURQRXV FRPPXQLFD
WLRQ 6\QFKURQRXV E\WHRULHQWHG SURWRFROV DUH KDQGOHG LQ VHYHUDO PRGHV 7KH\
HQDEOH FKDUDFWHU V\QFKURQL]DWLRQ ZLWK D ELW RU ELW 6<1& FKDUDFWHU 0212
6<1& RU D ELW RU ELW V\QFKURQL]DWLRQ SDWWHUQ %,6<1& RU ZLWK DQ H[WHUQDO
V\QF VLJQDO /HDGLQJ V\QF FKDUDFWHUV DUH UHPRYHG ZLWKRXW LQWHUUXSWLQJ WKH &38
 RU ELW V\QF FKDUDFWHUV DUH GHWHFWHG ZLWK  RU ELW SDWWHUQV LQ WKH (6&& E\
RYHUODSSLQJ WKH ODUJHU SDWWHUQ DFURVV PXOWLSOH LQFRPLQJ V\QF FKDUDFWHUV DV VKRZ
LQ )LJXUH 
36
)XQFWLRQDO 'HVFULSWLRQ