10 Mbps ARCNET (ANSI 878.1) Controller with 2Kx8 On-Board RAM
Datasheet
A0
/nM
UX
A1
LE
A2/
BA
ADDRESS
DECODING
CIRCUITRY
2K x 8
RAM
nIOCS16
ADDITIONAL
REGISTERS
AD0-AD2,
D3-D15
STATUS/
COMMAND
REGISTER
nPULSE1
nPULSE2
nTXEN
nINTR
TX/RX
LOGIC
MICRO-
SEQUENCER
AND
RXIN
WORKING
REGISTERS
RESET
LOGIC
nRESET
XTAL1
XTAL2
OSCILLATOR
nRD/nDS
nWR/DIR
nCS
BUS
ARBITRATION
CIRCUITRY
DREQ
nDACK
NODE ID
LOGIC
RECONFIGURATION
TIMER
DMA
TC
nREFEX
Figure 5.10 - Internal Block Diagram
Table 5.1 - Typical Media
NOMINAL
ATTENUATION PER
1000 FT. AT 5 MHZ
CABLE TYPE
IMPEDANCE
RG-62 Belden #86262
RG-59/U Belden #89108
RG-11/U Belden #89108
5.5dB
7.0dB
5.5dB
7.0dB
93Ω
75Ω
75Ω
IBM Type 1 (Note 5.1)
Belden #89688
150Ω
IBM Type 3 (Note 5.1)
17.9dB
16.0dB
100Ω
Telephone Twisted Pair Belden
#1155A
COMCODE 26 AWG Twisted Pair
Part #105-064-703
105Ω
Note 5.1
Non-plenum-rated cables of this type are also available.
SMSC COM20022I 3V
Page 29
Revision 02-27-06
DATASHEET
SMSC [ SMSC CORPORATION ]
