|
Z85230 Datasheet, PDF (35/120 Pages) Zilog, Inc. – ENHANCED SERIAL COMMUNICATIONS CONTROLLER | |||
|
◁ |
==
(QKDQFHG 6HULDO &RPPXQLFDWLRQV &RQWUROOHU
WKH ODVW WZR ELWV RI WKH &5& ,Q WKH (6&& LW LV QRW QHFHVVDU\ WR SURJUDP WKLV IHD
WXUH :KHQ WKH FORVLQJ IODJ LV GHWHFWHG WKH ODVW WZR ELWV RI WKH &5& DUH WUDQVIHUUHG
LQWR WKH UHFHLYH ),)2 ,Q DOO RWKHU V\QFKURQRXV PRGHV WKH (6&& GRHV QRW FORFN
LQ WKH ODVW WZR &5& ELWV VDPH DV WKH 6&&
7[' )RUFHG +LJK LQ 6'/& ZLWK 15=, (QFRGLQJ :KHQ 0DUNLQJ ,GOH
:KHQ WKH (6&& LV SURJUDPPHG IRU 6'/& PRGH ZLWK 15=, GDWD HQFRGLQJ DQG
0DUN ,GOH :5 ELW LV ELW LV ELW LV WKH 7[' SLQ LV DXWRPDWLFDOO\ IRUFHG
+LJK ZKHQ WKH WUDQVPLWWHU HQWHUV WKH 0DUN ,GOH VWDWH 7KHUH DUH VHYHUDO GLIIHUHQW
ZD\V IRU WKH WUDQVPLWWHU WR HQWHU WKH ,GOH VWDWH ,Q HDFK RI WKH IROORZLQJ FDVHV WKH
7[' SLQ LV IRUFHG +LJK ZKHQ WKH 0DUN ,GOH FRQGLWLRQ LV UHDFKHG
 'DWD &5& IODJ DQG ,GOH
 'DWD IODJ DQG ,GOH
 'DWD DERUW RQ XQGHUUXQ DQG ,GOH
 'DWD DERUW FRPPDQG DQG ,GOH
 ,GOH IODJ DQG FRPPDQG WR ,GOH 0DUN
7KH )RUFH +LJK IHDWXUH LV GLVDEOHG ZKHQ WKH 0DUN ,GOH ELW LV VHW WR
7KLV IHDWXUH LV XVHG LQ FRPELQDWLRQ ZLWK WKH DXWRPDWLF 6'/& RSHQLQJ IODJ WUDQV
PLVVLRQ IHDWXUH :5¶ ELW LV WR DVVXUH WKDW GDWD SDFNHWV DUH IRUPDWWHG FRU
UHFWO\ ,Q WKLV FDVH WKH &38 LV QRW UHTXLUHG WR LVVXH DQ\ FRPPDQGV ,I :5¶ ELW
LV DV RQ WKH 6&& WKH 0DUN ,GOH ELW :5 ELW LV VHW WR WR HQDEOH IODJ WUDQV
PLVVLRQ EHIRUH DQ 6'/& SDFNHW WUDQVPLWV
,PSURYHG 7UDQVPLW ,QWHUUXSW +DQGOLQJ
7KH (6&& ODWFKHV WKH 7UDQVPLW %XIIHU (PSW\ 7%( LQWHUUXSW EHFDXVH WKH &5& LV
ORDGHG LQWR WKH 7UDQVPLW 6KLIW UHJLVWHU HYHQ LI WKH 7%( LQWHUUXSW GXH DW WKH ODVW
GDWD E\WH KDV QRW EHHQ UHVHW 7KH HQG RI D V\QFKURQRXV IUDPH LV JXDUDQWHHG WR
JHQHUDWH WZR 7%( LQWHUUXSWV HYHQ LI D 5HVHW 7UDQVPLW %XIIHU ,QWHUUXSW FRPPDQG
IRU WKH GDWD FUHDWHG LQWHUUXSW LV LVVXHG DIWHU WKH &5& LQWHUUXSW RFFXUV 7LPH $ LQ
)LJXUH 7ZR Reset TBE FRPPDQGV DUH UHTXLUHG 7KH 7[,3 ODWFKHV LI WKH (20
ODWFK UHVHWV EHIRUH WKH HQG RI WKH IUDPH
36
== (QKDQFHPHQWV
|
▷ |