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Title: - Avalon datasheet - Post by: intron on May 22, 2013, 06:17:39 AM Hi,
Read the datasheet of the Avalon 'A3256-Q48 SHA256 Processor' and to me there are few things not really clear about this REPORT_x pins. They seem open drain outputs, there are pull-ups required, so it looks like the REPORT_x lines of all Avalon chips can be tied togeter to form a party-line. This makes sense as it saves a lot of pins on the microcontroller. But if so, how are contentions resolved when two or more chips have found a golden nonce at the same time? Any ideas anyone? intron Title: Re: - Avalon datasheet - Post by: mgio on May 22, 2013, 06:37:33 AM Hi, Read the datasheet of the Avalon 'A3256-Q48 SHA256 Processor' and to me there are few things not really clear about this REPORT_x pins. They seem open drain outputs, there are pull-ups required, so it looks like the REPORT_x lines of all Avalon chips can be tied togeter to form a party-line. This makes sense as it saves a lot of pins on the microcontroller. But if so, how are contentions resolved when two or more chips have found a golden nonce at the same time? Any ideas anyone? intron I haven't looked at the datasheet myself yet, but maybe they figure that won't be a problem since the chances of that happening are extremely slim. Title: Re: - Avalon datasheet - Post by: intron on May 22, 2013, 06:41:42 AM Hi, Read the datasheet of the Avalon 'A3256-Q48 SHA256 Processor' and to me there are few things not really clear about this REPORT_x pins. They seem open drain outputs, there are pull-ups required, so it looks like the REPORT_x lines of all Avalon chips can be tied togeter to form a party-line. This makes sense as it saves a lot of pins on the microcontroller. But if so, how are contentions resolved when two or more chips have found a golden nonce at the same time? Any ideas anyone? intron I haven't looked at the datasheet myself yet, but maybe they figure that won't be a problem since the chances of that happening are extremely slim. Could very well be that way. I'll try to calculate the changes of a collision and thus lost data. intron |