Thanks alot for the help - I got three quick responses that said about the =
thine and gave me the info that I needed and learned a few things in the =
=46rom Guy Harris:
> I am running a SPARC 20 right now and have added
>an new SPARC module (501-2519). The FEH1 says this
>is a 60MHz module, but the MXCC runs only at 50MHz (what
>is a MXCC??).
I think it stands for "Mbus/XDbus Cache Controller".
SuperSPARC is a one-chip microprocessor that includes:
1) integer, floating-point, and memory-management units;
2) a 20K-byte on-chip instruction cache and a 16K-byte on-chip
3) an interface to Sun's Mbus, as used on the SPARCstation 10
and 20, clones of those machines (and some non-clone machines
such as Auspex machines), and the older SPARCserver 600MP;
4) an interface to an MXCC.
An MXCC, also known as "SuperCache", is a chip that connects to a
SuperSPARC chip (the two chips are normally mounted on a single
daughterboard, i.e. an Mbus or XDbus module, along with the cache RAM
that the MXCC controls) and includes:
1) a cache controller for a 1 megabyte or 2 megabyte unified
2) an interface to Sun's Mbus;
3) an interface to Sun's XDbus, used on the SPARCserver 1000,
SPARCcenter 2000, and some large Cray machine that is
I think the Mbus in a SPARCstation 20 runs at 50 MHz (and that the one
in current SS10's runs at 40 MHz). I also think this means that if you
have a 60 MHz SuperSPARC processor, it *cannot* directly plug into the
Mbus on an SS20, because the chip doesn't run at the same speed as the
However, an MXCC *can* plug into both a 60 MHz SuperSPARC and a 50 MHz
Mbus at the same time - in fact, that's what you have, I suspect, and
that's probably why the FEH1 (Field Engineer's Handbook?) says that the
MXCC is running at 50 MHz.
>My question is, is this a SPARC 20/50,
>a SPARC 20/51, or even a SPARC 20/6x????
I suspect Sun calls it a SPARCstation 20 model 6x; a page on Sun's Web
site indicates that, for example, an SS20 with one 60 MHz SuperSPARC
processor is a "Model 61".
Also, some other info from Casper Dik --
You can check with prtconf which speed the machine is running.
Somewhere in prtconf -vp you'll find:
clock-frequency: 03938700 <<<---- 60MHz (hex)
name: 'TI,TMS390Z55' <<<- SuperSPARC processor.
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