No subject

Tony DeLaCruz tdelacru at QNTM.COM
Fri Jun 13 13:49:40 PDT 1997


* From the SCSI Reflector (scsi at symbios.com), posted by:
* tdelacru at qntm.com (Tony DeLaCruz)
*
--IMA.Boundary.898432668
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
Content-Description: cc:Mail note part

To all,

I was wondering if some could confirm that it is illegal to assert the I/O
during SCAM selection. The following is my interpretation of the correct
sequence of SCAM selection:

Start of SCAM Protocol:
1. Wait for Bus Free to occur.
    (Section 6.1.1 of SCSI 2 specification)
    a. Detection of both SEL and BSY false.
    b. All devices shall release all SCSI bus signals after detecting Bus Free.
2. All SCSI bus signals are false at this point.
    (Section 6.1.2 of SCSI 2 specification)
    a. Host asserts the BSY signal and optionally asserts the Data Bus signal
representing it's ID.
    b. The Host asserts the SEL signal after winning arbitration.
3. Only the BSY and SEL signals (and possibly a Data Bus signal) are asserted at
this.
    (Section B.4.1 of SPI Amendment r03)
    a. Host shall release all DATA BUS signals and assert the MSG signal.
    b. Wait at least two deskew delays and release the BSY signal.
4. Only the SEL and MSG signals should be asserted at this time. There has been
no reference to the assertion of the I/O signal yet. This is the point which we
sample the bus for a valid SCAM selection. We look for SEL and MSG signals
asserted and all other signals released for confirmation. Is it safe to say that
it would be an invalid SCAM selection if any other Bus signal is asserted other
than the SEL and MSG signals?

----------------------------------------------------------------

Tony De La Cruz

Quantum Corporation
500 McCarthy Blvd.
Milpitas, CA 95035
E-Mail: tdelacru at qntm.com

--IMA.Boundary.898432668
Content-Type: application/octet-stream; name="TNF900.TMP"
Content-Transfer-Encoding: x-uue
Content-Description: Unknown data type
Content-Disposition: attachment; filename="TNF900.TMP"

begin 666 TNF900.TMP
M>)\^(J\!`0:0"``$```````!``$``0>0!@`(````Y`0```````#H``$(@`<`
M&````$E032Y-:6-R;W-O9G0 at 36%I;"Y.;W1E`#$(`0V`!``"`````@`"``$$
M@`$``0````````$%@`,`#@```,T'!@`-``T`,0`D``4`3@$!#(`"`!D&``!4
M;R!A;&PL#0H-"DD@=V%S('=O;F1E<FEN9R!I9B!S;VUE(&-O=6QD(&-O;F9I
M<FT@=&AA="!I="!I<R!I;&QE9V%L('1O(&%S<V5R="!T:&4 at 22]/(&1U<FEN
M9R!30T%-('-E;&5C=&EO;BX at 5&AE(&9O;&QO=VEN9R!I<R!M>2!I;G1E<G!R
M971A=&EO;B!O9B!T:&4 at 8V]R<F5C="!S97%U96YC92!O9B!30T%-('-E;&5C
M=&EO;CH-"@T*4W1A<G0@;V8 at 4T-!32!0<F]T;V-O;#H-"C$N(%=A:70 at 9F]R
M($)U<R!&<F5E('1O(&]C8W5R+ at T*("`@("A396-T:6]N(#8N,2XQ(&]F(%-#
M4TD@,B!S<&5C:69I8V%T:6]N*0T*("`@(&$N($1E=&5C=&EO;B!O9B!B;W1H
M(%-%3"!A;F0 at 0E-9(&9A;'-E+ at T*("`@(&(N($%L;"!D979I8V5S('-H86QL
M(')E;&5A<V4 at 86QL(%-#4TD at 8G5S('-I9VYA;', at 869T97(@9&5T96-T:6YG
M($)U<R!&<F5E+ at T*,BX at 06QL(%-#4TD at 8G5S('-I9VYA;', at 87)E(&9A;'-E
M(&%T('1H:7,@<&]I;G0N#0H@("`@*%-E8W1I;VX at -BXQ+C(@;V8 at 4T-322`R
M('-P96-I9FEC871I;VXI#0H@("`@82X at 2&]S="!A<W-E<G1S('1H92!"4UD@
M<VEG;F%L(&%N9"!O<'1I;VYA;&QY(&%S<V5R=',@=&AE($1A=&$@0G5S('-I
M9VYA;"!R97!R97-E;G1I;F<@:70G<R!)1"X-"B`@("!B+B!4:&4 at 2&]S="!A
M<W-E<G1S('1H92!314P@<VEG;F%L(&%F=&5R('=I;FYI;F<@87)B:71R871I
M;VXN#0HS+B!/;FQY('1H92!"4UD at 86YD(%-%3"!S:6=N86QS("AA;F0@<&]S
M<VEB;'D at 82!$871A($)U<R!S:6=N86PI(&%R92!A<W-E<G1E9"!A="!T:&ES
M+ at T*("`@("A396-T:6]N($(N-"XQ(&]F(%-022!!;65N9&UE;G0@<C`S*0T*
M("`@(&$N($AO<W0@<VAA;&P@<F5L96%S92!A;&P at 1$%402!"55,@<VEG;F%L
M<R!A;F0 at 87-S97)T('1H92!-4T<@<VEG;F%L+ at T*("`@(&(N(%=A:70 at 870@
M;&5A<W0@='=O(&1E<VME=R!D96QA>7, at 86YD(')E;&5A<V4@=&AE($)362!S
M:6=N86PN#0HT+B!/;FQY('1H92!314P at 86YD($U31R!S:6=N86QS('-H;W5L
M9"!B92!A<W-E<G1E9"!A="!T:&ES('1I;64N(%1H97)E(&AA<R!B965N(&YO
M(')E9F5R96YC92!T;R!T:&4 at 87-S97)T:6]N(&]F('1H92!)+T\@<VEG;F%L
M('EE="X at 5&AI<R!I<R!T:&4@<&]I;G0@=VAI8V@@=V4@<V%M<&QE('1H92!B
M=7, at 9F]R(&$@=F%L:60 at 4T-!32!S96QE8W1I;VXN(%=E(&QO;VL at 9F]R(%-%
M3"!A;F0 at 35-'('-I9VYA;', at 87-S97)T960 at 86YD(&%L;"!O=&AE<B!S:6=N
M86QS(')E;&5A<V5D(&9O<B!C;VYF:7)M871I;VXN($ES(&ET('-A9F4@=&\@
M<V%Y('1H870@:70@=V]U;&0 at 8F4@86X@:6YV86QI9"!30T%-('-E;&5C=&EO
M;B!I9B!A;GD@;W1H97(@0G5S('-I9VYA;"!I<R!A<W-E<G1E9"!O=&AE<B!T
M:&%N('1H92!314P at 86YD($U31R!S:6=N86QS/PT*#0HM+2TM+2TM+2TM+2TM
M+2TM+2TM+2TM+2TM+2TM+2TM+2TM+2TM+2TM+2TM+2TM+2TM+2TM+2TM+2TM
M+2TM+2TM#0H-"E1O;GD at 1&4 at 3&$@0W)U>@T*#0I1=6%N='5M($-O<G!O<F%T
M:6]N#0HU,#`@36-#87)T:'D at 0FQV9"X-"DUI;'!I=&%S+"!#02`Y-3`S-0T*
M12U-86EL.B!T9&5L86-R=4!Q;G1M+F-O;0T*#0H`+_<!((`#``X```#-!P8`
M#0`-`"P`+0`%`%(!`0F``0`A````,C<V1#4R.3(Q,T4T1#`Q,3 at T-S(P,$$P
M,C0Y,S$Y0T,`T`8!`Y`&`+0&```=````"P`"``$````+`",```````,`)@``
M````"P`I```````#`#8``````$``.0`0(-E-.WB\`0(!<0`!````%@````&\
M>#M-UY)2;2GD$Q'0A'(`H"23&<P```,`!A"Q#']R`P`'$+`$```>``@0`0``
M`&4```!43T%,3"Q)5T%35T].1$5224Y'24933TU%0T]53$1#3TY&25)-5$A!
M5$E425-)3$Q%1T%,5$]!4U-%4E142$5)+T]$55))3D=30T%-4T5,14-424].
M5$A%1D],3$]724Y'25--``````(!"1`!``````0``/P#```J!P``3%I&=21I
M_RAW``H!`P'W(`*D`^,"`&.":`K`<V5T,"`'$X\"@P!0`O(/651A:`-QY0*`
M?0J!=6,`4`L#"V#`;F<Q,#,S"Z81H.1O(`=`;"P*H at J$"H#022!W800@=P(@
M!(%)"X!G(`:0(',#<&4B(`6@=6QD%K%N9F!I<FT@=`^`!4!IQQ?1!"`#$&QE
M9P=`%Y`_%"$$$`20!4`7H!:@22\83R!D"'$6$5-#08I-%F!E&'!C=&D"(-XN
M$:`9 at 0(0%%!O`_`6$KD$(&UY%C`",`20<`EP\P&0&P(@;Q90&7(%H0EPRQKP
M&J%Q"E!N8Q:@'9']&FPZ%(H*\P8``9`901\67E`#8!C0".$@)3$;0%=/"W`%
M0`(0!<!"=00 at 1E<)T1C"(G!C"'`N%(0 at C25A*`9@&O, at -BXC(*HQ'P13%4`R
M%F!P!9"I!I!I8QTS*24(81M`?D0/P"7%'9$&X!>@!@!%SDP4,!7`(]!361N0
M!T!K#[`D^6(;0$$44!G at 9?9V)Y`'D7,/@"P!"7`8<&\5<!:@+-(FPV(C\0"0
M9_YN*M$4,`&`!)`L(2D#%A'[(^8D]3(KU"W?"L`;@2K2YQ0P&5(8(7!O'*$D
M_R8%CR<0)I\GKRBQ2&]S!4"_&00$(!ER*H(N9"HS;P4PKQL1%$$<@#@*1!?`
M82/3/SD%"7`<\0^P`C`6`W0G^00 at 240K'!MB-[\J`CD&7R[S&_$#`!81"L!B
M%_!RRQTS,\4S&T!/;CHQ.(9W*D(_F`0@*"I",W`$$&GW`F`Z03L>*3)#&00)
M@#+FHS//'6%"+C0F95`50-Y!!X`5P$FQ!4!R$U`VWT,>82S/1$%402/05=\%
M\"YG*E$9"07 at 1RY5*QP_(U,7P2TR&5$5H"PA<VOW!]$!``M@>4VT+18XC$>5
M?R#T2/!":"H&3L at LDA;38O]&?SAA!W$;0S)A#X`$(%<@V0GP(&X4(`EP9ECA
M'M*_&-$9<AD$'5D9LCD%>0_`_QM"&"(X9#-S%5`S,`]P%5#Q%J!S86T+4%+D
M+B(CHK4[4'8'0&DA,1I]5Q:@^0D`;VLCDU5_+K)&ITWB_RP!*<$O$2YF+147
M`".B%R7_0809H!@Q'F$NX"137K!"HO\7Q!6 at 5N8#H`N`8`\=4A9!_P!P'(!D
M=#MY&"%&EV1T%Z$W`Z!5/RYT/R"9$(-S,?HV%(0M<-]Q[W+_<\H4BB<4$&L1
M*.`@3#M00W(D=7H4BE%U`'!T=3\7@`A0'.`%L!TS%(0U,%$/X$UC0R%Q:!R`
M0JAL=F1'E4T#$'`7\"T5<"QV,$SP.7C0,S7Q%(1%+4T+<"*@%Y!1TI$%`'5`
M<0(P;2X%H%YM(#\+IQ23$C$`?Y`#`!`0``````,`$1```````P"`$/____]`
M``<PX-90H#IXO`%```@PX-90H#IXO`$+``"`""`&``````#`````````1@``
M```#A0````````,``H`((`8``````,````````!&`````!"%`````````P`%
M@`@@!@``````P````````$8`````4H4``+<-```>`"6`""`&``````#`````
M````1@````!4A0```0````0````X+C```P`F@`@@!@``````P````````$8`
M`````84````````+`"^`""`&``````#`````````1@`````.A0````````,`
M,(`((`8``````,````````!&`````!&%`````````P`R@`@@!@``````P```
M`````$8`````&(4````````>`$&`""`&``````#`````````1@`````VA0``
M`0````$`````````'@!"@`@@!@``````P````````$8`````-X4```$````!
M`````````!X`0X`((`8``````,````````!&`````#B%```!`````0``````
<```>`#T``0````$``````````P`--/TW```AH```
`
end
--IMA.Boundary.898432668--
*
* For SCSI Reflector information, send a message with
* 'info scsi' (no quotes) in the message body to majordomo at symbios.com




More information about the T10 mailing list