I got some info on the arc 100 and 150 kits.
They seem to be centered around the MCT-ADR address path controller and a
MCT-DP data path controller.
MCT-ADR: (PD31432) 240 pin PQFP package 1.8 watts
Interfaces to the Vr4000 microprocessors
8 to 64 MB ram
video (peak 33 MB/s write 66 MB/sec read) max 8MB vram, 8MB dram
Control logic for pc-style peripheral devices
8 slave DMA channels
I/O cache controller (8 32 byte fully associative cache blocks)
1-15 millisecond interval counter
Memory controller provides:
1-8,16,32 byte writes
1-8,16,32 byte reads
8 byte video reads
and 1-8 byte video write
DMA controller supports 8 seperate DMA controllers, each is able to
support a single read or write I/O data flow to and from the system memory and
the I/O device. Each controller has a channel mode,channel enable,
channel byte count, and channel address register.
A diagram shows the 8 devices as mouse and keyboard, parallel and serial ports,
prom, sound, NVRAM,floppy, rt clock, scsi, and ethernet
MCT-DP (PD31431) data path controller
Chip is basically a crossbar with 6 major connections:
Vr4000 family data/adress to memory data lines (store)
Memory data lines to the Vr4000 data/address (load)
Vr4000 family data/address bus to the i386 data/address bus (I/O store)
i386-style databus to the Vr4000 (I/O load)
i386-style data bus to memory (DMA read)
Memory data lines to the i386 data bus lines (DMA write)
Memory interlace is formed by the two MCT-DP chips is four words or 128 bits
wide. The chip contains a 128 bit write buffer that is used to buffer all
data from the vr 4000 to the system. The chip also contains 8 128 byte
I/O data buffers which buffer data tranfers between the i386 style bus and
the memory system. These buffers allow concurrent vr4000 family memory
operations and I/O direct memory access operations.
Not that I understand all of it but it sounds good to me.
Bill 1st> Broadley@neurocog.lrdc.pitt.edu
Broadley@schneider3.lrdc.pitt.edu <2nd 3rd> Broadleyfirstname.lastname@example.org
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