COM20051 Datasheet, PDF (9/82 Pages) List of Unclassifed Manufacturers – Integrated Microcontroller and ARCNET (ANSI 878.1) Interface

FFFFh
256 BYTES
64K
BYTES
ARCNET CORE
ADDRESS DECODE
REGISTER
(FIXED LOCATION)
VALUE x 100h
PAGE
LOCATION CAN
VARY
0000h
FIGURE 2 – COM20051 EXTERNAL DATA ADDRESS SPACE
NAME
ADR DEC
BIT 7
A15
ADDRESS DECODE REGISTER
BIT 6 BIT 5 BIT 4 BIT 3
A14
A13
A12
A11
BIT 2
A10
BIT 1
A9
BIT 0
A8
LOCATION: FFFFh of the External Data Memory space. Default: 00h
EXAMPLE:
Address Decode Register = 80h
ARCNET core registers will be located at 8000h + Register offset (e.g. ARCNET
Configuration Register offset = 06h, physical address = 8006h).
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