[comp.sys.transputer] External Memory Write Cycle ...

dario@techunix.BITNET (Dario Ringach) (12/20/88)

When writting a single byte to external memory, what happens with
the rest of the MemADxx lines, are they in tristate or driven by the
Tp to a known value?  Thanks in advance.
--
Dario.

rtm1@thumper.bellcore.com (Ravi Masand) (12/21/88)

In article <> you write:
>When writting a single byte to external memory, what happens with
>the rest of the MemADxx lines, are they in tristate or driven by the
>Tp to a known value?  Thanks in advance.
>--
>Dario.

The transputer reference manual (Oct 1986, pg 46) says:
"A seperate MemWrB signal is provided for each byte. A word (32 bit ??)
write uses all the notMemWrB signals. If a particular byte is not to be
written, then the corresponding data outputs are tristated"

So, yes, they are tristated.

				Ravi Masand
				bellcore!thumper!rtm1