| ??? 09/09/04 02:01 Read: times |
#77108 - RE: Proposal: Internal Data Bus Responding to: ???'s previous message |
To underscore Erik's comment, i don't see mass storage having a select. Mass storage would presumably be part of the I/O 8052 which has a select line, wouldn't it? Or by "you don't see mass storage having a select" do you mean that you don't think mass storage should be attached via a slave 8052? If mag disk connects to the central processor then it's going to want to pour data into the host. I would think the mass storage would connect to the I/O 8052, not the central 8052 directly. In any case, I would think the 8052 would request one sector at a time, wouldn't it? Unless we do some kind of DMA in which case the data wouldn't go through any of the 8052s. Assuming intelligence for the mass storage sub-element relieves the host of disk format overhead and real-time response, not necesarily throughput (unless DMA). I'm not sure I understand the above. Are you saying that disk access would be too slow if the central 8052 requests it of the I/O 8052 which in turn requests the data from the mass storage device? I would allocate an interrupt for mass storage support. When would mass storage interrupt a processor? It seems the mass storage should only be providing data when requested by the 8052 it is attached to. When would an interrupt be necessary? Regards, Craig Steiner |
