Date: Sun, 12 Nov 2006 22:30:43 +0100 From: admin@cordef.net.pl To: "Justin T. Gibbs" <gibbs@scsiguy.com> Cc: aic7xxx@freebsd.org Subject: Re: Adaptec 29160 + Fujitsu MAS3367NC - cannot force U160 Message-ID: <45579283.7080302@cordef.net.pl> In-Reply-To: <45576259.9040605@scsiguy.com> References: <455632E8.5020301@cordef.net.pl> <4557484D.4050505@scsiguy.com> <45574C1C.5070404@cordef.net.pl> <45576259.9040605@scsiguy.com>
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Justin T. Gibbs napisał(a): > The jumpers, when populated, force termination to be enabled. You > shouldn't need > them: > > http://adaptec-tic.adaptec.com/cgi-bin/adaptec_tic.cfg/php/enduser/std_adp.php?p_faqid=1092&p_created=949587020&p_sid=oPDooumi&p_lva=&p_sp=cF9zcmNoPTEmcF9zb3J0X2J5PSZwX2dyaWRzb3J0PSZwX3Jvd19jbnQ9MjImcF9wcm9kcz0wJnBfY2F0cz0wJnBfcHY9JnBfY3Y9JnBfc2VhcmNoX3R5cGU9YW5zd2Vycy5zZWFyY2hfbmwmcF9wYWdlPTEmcF9zZWFyY2hfdGV4dD0yOTE2MCBqdW1wZXI*&p_li=&p_topview=1 > > > The only other guess I have is that the "force-se" jumper is populated > on both of your > drives. You could verify that the 29160 believes the bus is in SE > mode by instrumenting > aic7xxx.c:ahc_devlimited_syncrate(). The first if block is where the > driver checks the > operating mode of the transceiver and limits the negotiation accordingly. > > -- > Justin Well, I don't think devices are forced to SE, at lest not because of jumper setting. I checked - on IBM drive this jumper is opened and Fujitsu doesn't have one at all. The only one source of problems I can see is adapter. It has the DIFFSNS signal left not connected. Theoretically it means device is set to differential. But what if controller forces it to low? Tomorrow I'll try to connect it to the +5V and see what will happen. Justin, let me ask you one more question: I wonder where is the setting "GOAL" taken from? I understand that "USER" is a maximum possible transfer for the interface and "CURR" is maximum possible transfer for the device (calculated at DV stage). Is this setting connected with state of bus - i.e. if bus is SE then GOAL is forced to be 40.0 instead of 160.0? Or it is set somewhere in device EEPROM?
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