Specifications

EPC-33/34 Hardware Reference
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Flash Disk Registers:
Address D7-D4 D3-D0
0x389 Flash address A19-A16 Flash address A15 - A12
0x38A unused Flash address A23 - A20
0x38B unused Memory Window Size select
A fourth register is used to provide control of the programming voltage to the Flash
disk. This register is located at I/O port 0x38C and uses only one bit. When this bit
is set to 1, the programming voltage is enabled. A 0 in this bit disables all write
operations to the Flash disk. This bit can also be read back to verify that the
programming voltage is actually being supplied to the Flash components (a ‘1’
indicates the presence of the programming voltage).
Flash Control Register 0x38C:
D7-D1 D0
Unused Flash program voltage enable
Ethernet Port
The Ethernet subsystem is compatible with Western Digital 8013, Novell NE2000
and NE2000+ cards through the use of National Semiconductor's DP83905
AT/LANTIC chip.
The default configuration for the Ethernet port is as a WD8013-compatible card.
The I/O base address is 0x280. Interrupts are signaled on IRQ5. These parameters
can be changed by running the AUTOSET program that is supported under DOS.
The alternate I/O base addresses are 0x240, 0x280, 0x2C0, 0x300, 0x320 and 0x340.
The alternative interrupts are IRQ9, IRQ10 and IRQ15.
RadiSys assigns a unique Ethernet ID to each board at production time using
RadiSys’ range of IDs.
Two 8K x 8 RAM chips are present for packet buffering.
A boot ROM is not supported.
The EPC-33/34 provides a connector for a 10BaseT Ethernet cable on the top edge of
the circuit board.