RE: <I think that what I'm assuming is that you need the circuitry to do the equivalent of controlling and terminating a scsi bus. So that two channels of rambus out of a timna, instead of 1 channel, requires 32 data lines vs 16, plus double the number of control lines, ground traces, etc. And two sets of bus latches, controllers, whatever, at the Rambus chip>
Imagine everything that makes up one rambus channel: 16 data lines, a bunch of control lines, etc, traces between timna and the drdrams, and a terminating resistor on each trace. Now select all that and do a copy and paste and you get a second channel. Note there are no connection between the two channels. Everything is identical and there are just two of them. So the pin count on timna is double. Each drdram chip is on one channel or the other but never on both. The drdram chips are exactly the same as the ones in systems with only one channel. All "bus latches, controllers, whatever," are inside either timna or the drdrams. |
