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ARCNET 5 Port HUB Controller
Datasheet
SMSC TMC2005-JT Page 7 Revision 1.1 (07-24-07)
DATASHEET
PIN NO. NAME INPUT/OUTPUT DESCRIPTION NOTE
44 VDD5 Power Supply.
45 nP1BAK OUTPUT nPULSE1 output (for backplane mode).
46 nPULSE2 OUTPUT nPULSE2 output (for normal mode).
47 nPULSE1 OUTPUT nPULSE1 output (for normal mode)
48 VSS7 Ground
49 RXINA0 INPUT
Port A-0 Rx-data input from media
transceiver. Pull-up
50 SA INPUT
Port A. Polar assignment for RXINA0/A1
output (0:active Hi, 1:active Low) Pull-up
51 TXENA0 OUTPUT Port A-0 Tx output to media transceiver.
52 LA INPUT
Port A. Polar assignment for TXENA0/A1
output (0:active Low, 1:active Hi) Pull-up
53 RXINA1 INPUT
Port A-1 Rx-data input from media
transceiver. Pull-up
54 MA INPUT
Port A. Mode assignment for
TXENA0/A1 (0:pulse output, 1:Tx control
output) Pull-up
55 TXENA1 OUTPUT Port A-1 Tx output to media transceiver.
56 VDD6 Power Supply
57 NC Reserved. It should be open.
58 VSS8 Ground
59 RXINB0 INPUT
Port B-0 Rx-data input from media
transceiver. Pull-up
60 SB INPUT
Port B. Polar assignment for RXINA0/A1
input (0:active Hi, 1:Active Low) Pull-up
61 TXENB0 OUTPUT Port B-0 Tx output to media transceiver.
62 LB INPUT
Port B. Polar assignment for TXENA0/A1
output (0:active Low, 1:active Hi) Pull-up
63 RXINB1 INPUT
Port B-1 Rx-data input from media
transceiver. Pull-up
64 MB INPUT
Port B. Mode assignment for
TXENA0/A1 (0:pulse output, 1:TX control
output) Pull-up
Note: Pull-up: Input with a pull-up resistor 70KΩ ± 30%
TX/RX Interface
FEATURE NAME INPUT/OUTPUT DESCRIPTION
RX Port RXINA [0:1]
RXINB [0:1]
EXTRX
INPUT Setup the polarity by SA, SB, SE.
RX Port Polar
Assignment
SA, SB, SE INPUT Setup the polarity of RXINA [0:1],
RXINB [0:1], EXTTX.
0 : active H
1: active L
TX Port TX Control TXENA [0:1]
TXENB [0:1]
EXTTX
OUTPUT TX data pulse (Mx=0) or TX
enable signal (Mx=1).
Setup TX mode by MA, MB, ME.
Setup the polarity by LA, LB, LE
TX Port TX Data
Output
nPULSE [1:2] OUTPUT TX pulse data into HYC9068S-
SK/9088S-SK when ARCNET
chip is at normal mode.
The pulse is always active Low.
TX Port nP1BAK OUTPUT TX pulse data into RS485 driver
or HYC2485S/2488S when
ARCNET chip is at backplane