TMC2005-JT SMSC Corporation, TMC2005-JT Datasheet - Page 20

• Manufacturer Part Number: TMC2005-JT
• Description: ARCNET 5 Port HUB Controller
• Manufacturer: SMSC Corporation

ARCNET 5 Port HUB Controller
Datasheet
The five ports can be divided into three groups (group A: two ports, group B: two ports, extension port: one port) and
each group can select TX/RX polar, noise cut mode, and big jitter mode respectively. Select pins for each group are
as follows:
Various Setup
Note for Unused port
Unused ports can be left open because RX port (RX input), RX polar (S input), TX polar (L input), TX control (M input)
pins have internal pull-up resistors. Because of internal pull-up resistors, select pins for noise cut (nMB input), big
jitter (nBJ input) can be left open when used for setting “OFF”.
Example for Power-On Reset Circuit
Revision 1.0 (01-30-06)
SA, SB, SE
1
0
0
1
RX POLARITY
TX POLARITY
TX CONTROL
EXTENSION
NOISE CUT
BIG JITTER
FUNCTION
TRANSMIT
RECEIVE
LA, LB, LE
0
1
0
1
Example For Operation Mode Setup To Each Port
MA, MB, ME
TXENA0, 1
RXINA0, 1
GROUP A
FIGURE 9 - POWER-ON RESET
nMBA
nBJA
1
0
1
1
MA
SA
LA
DATASHEET
PORT GROUP
Active Low
Active High
Active High
Active Low
RX POLAR
Page 20
TXENB0, 1
RXINB0, 1
GROUP B
nMBB
nBJB
MB
SB
LB
Active High
Active Low
Active High
Active Low
TX POLAR
HYC2485S/HYC2488S
Optical Transceiver
HYC9088/HYC9068
RS485 Transceiver
EXTENSION
TRANSCEIVER
nEXTOD
EXTRX
EXTTX
nMBE
nBJE
ME
SE
LE
SMSC TMC2005-JT