Transputer's DMA capability: A question

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1 total messages Started by Ravi Masand Fri, 22 Mar 1991 18:34

#1554

Author: Ravi Masand
Date: Fri, 22 Mar 1991 18:34

23 lines
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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

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