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 70K
Ω
± 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
