COM20020ILJP Datasheet, PDF (24/72 Pages) Microchip Technology – 5Mbps ARCNET (ANSI 878.1) Controller with 2K x 8 On-Chip RAM

5Mbps ARCNET (ANSI 878.1) Controller with 2K x 8 On-Chip RAM
Datasheet
A0/nMUX
A1
A2/BALE
ADDRESS
DECODING
CIRCUITRY
AD0-AD2,
D3-D7
2K x 8
RAM
ADDITIONAL
REGISTERS
nINTR
nRESET
STATUS/
COMMAND
REGISTER
RESET
LOGIC
MICRO-
SEQUENCER
AND
WORKING
REGISTERS
TX/RX
LOGIC
nRD/nDS
nWR/DIR
nCS
BUS
ARBITRATION
CIRCUITRY
RECONFIGURATION
TIMER
OSCILLATOR
NODE ID
LOGIC
nPULSE1
nPULSE2
nTXEN
RXIN
XTAL1
XTAL2
Figure 5.6 - Internal Block Diagram
Table 5.1 - Typical Media
CABLE TYPE
RG-62 Belden #86262
RG-59/U Belden #89108
RG-11/U Belden #89108
IBM Type 1* Belden #89688
IBM Type 3* Telephone Twisted Pair
Belden #1155A
COMCODE 26 AWG Twisted Pair
Part #105-064-703
NOMINAL
IMPEDANCE
93Ω
75Ω
75Ω
150Ω
100Ω
105Ω
ATTENUATION PER 1000 FT.
AT 5 MHZ
5.5dB
7.0dB
5.5dB
7.0dB
17.9dB
16.0dB
*Non-plenum-rated cables of this type are also available.
Revision 12-05-06
Page 24
DATASHEET
SMSC COM20020I Rev D