Hello all I am trying to estimate the size of a project which will include an ARCnet interface. I don't have access to the ARCnet spec (not freely available) at the moment so I can not give any number. If anyone has good pointers or a quick rule of thumb... Thanks in advance Nicolas PS don't tell me I will need the spec, I already know :o)
A *very rough* estimate would be to look at the size of a 10Base-2 Ethernet Phy + MAC. Sure, the implementation will be totally different, but the basic functions and speed are equivalent.
You may need a few k bytes of buffer ram, but this may be shared with your system ram if you're short of chip area.
IIRC, Arcnet drives a rather large signal (some V p-p) into a 93 ohm cable. You will probably need a heavy duty driver just to get the current. It may turn out to be more cost effective to use a separate chip for that. The last time I designed one of these, I used a fastish opamp (LM6061?) and an LH0002 to drive the cable. That was for a one-off, cost-insensitive project.
Regards, Allan
Allan Herriman a =E9crit:
Sounds good... :o)
I'm in the preliminary phase of the project (feasability study, actually). I get some inspiration from SMSC's COM20020 datasheet. This chip has 2Kbytes of RAM.
Still following SMSC's datasheet... Their evaluation board uses an HYC9088 as physical interface so I guess I'll use it too.
Thanks a lot Nicolas
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