rtm1@salt.bellcore.com (Ravi Masand) (03/23/91)
This is a question related to the transputer's DMA capability. Seems like, when the transputer gives up the bus (takes MemGranted high) , it only tristates the 32 address/data bits leaving the notMemRd, notMemWr3-0 and notMemS0-4 in their inactive state. Is this correct ? This means I have to disconnect them externally (from the memory system) to allow a device to perform DMA. Anyone know the logic behind this ?? Even the lowly 68000 and the 8086/88 relenquish the RD/WR control lines. Many Thanks Ravi Masand rtm1@thumper 201-829-4593