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LANC Interrupt
The MC2 chip provides an interrupt control register for normal LANC
termination and another register for bus error termination of LANC
operation. The MC2 chip requests an interrupt at the level programmed in
the LANC interrupt control registers if the interrupt is enabled and a
positive edge is detected on the 82596CA INT* pin or if the LANC bus
error condition is detected.
53C710 SCSI Controller Interface
The MC2 chip provides a map decoder and an interrupt handler for the
NCR 53C710 SCSI I/O Processor. The base address for the 53C710 is
$FFF47000. The MC2 chip requests an interrupt at the level programmed
in the SCSI interrupt control register if the interrupt is enabled and a low
level is detected on the 53C710 IRQ* pin.
SRAM Memory Controller
The SRAM base address and size are programmable. The SRAM
controller is designed to operate with 100 ns devices. The size of the
SRAM is initialized in the DRAM/SRAM Options Register when the
MVME172 is reset. SRAM performance at 25 MHz is 5,3,3,3 for read and
write cycle. SRAM performance at 33 MHz is 6,4,4,4 for read cycles and
6,3,3,3 for write cycles.
NON-ECC DRAM Memory Controller
When the DRAM is non-ECC, the MC2 chip ASIC determines the DRAM
performance. This section describes the DRAM options for that case.
The DRAM base address and array size are programmable. The DRAM is
configured as an interleaved array if the size is 16MBytes and non
interleaved if the size is 4 or 8 MBytes.
Parity checking and parity exception action is also programmable. The
DRAM array size and DRAM device size is initialized in the
DRAM/SRAM Options Register.
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Functional Description
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