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ARCNET 5 Port HUB Controller
Datasheet
Revision 1.1 (07-24-07) Page 6 SMSC TMC2005-JT
DATASHEET
DESCRIPTION OF PIN FUNCTIONS
PIN NO. NAME INPUT/OUTPUT DESCRIPTION NOTE
1 TXENB1 OUTPUT Port B-1 Tx output to media transceiver
2 HM INPUT
Setting for traffic release time (It should
be open for normal operation.) Pull-up
3 SE INPUT
Port EXT. Polar assignment for EXTRX
input (0:active Hi, 1:active Low) Pull-up
4 NC Reserved. It should be open.
5 LE INPUT
Port EXT. Polar assignment of EXTTX
output (0:active Low, 1:active Hi) Pull-up
6 EXTRX INPUT
Port EXT. RX-Data input from media
transceiver. Pull-up
7 ME INPUT
Port EXT. Output mode assignment of
EXTTX (0:pulse output, 1:Tx control
output) Pull-up
8 VSS1 Ground
9 EXTTX OUTPUT Port EXT. Output to media transceiver.
10 VDD1 Power Supply
11 CKO OUTPUT Clock Output
12 VSS2 Ground
13 CKM2 INPUT Network speed (data rate) setting. Pull-up
14 CKM1 INPUT Pull-up
15 CKM0 INPUT Pull-up
16 NC Reserved. It should be open.
17 RXFLT INPUT Test Pin. It should be open. Pull-up
18 nPLLTST INPUT
Test Pin for PLL.. It should connected to
VDD (Set to high)
19 VDD2 Power Supply
20 XTLI INPUT X'tal input/External clock input.
21 XTLO OUTPUT X'tal output
22 VSS4 Ground
23 NC Reserved. It should be open.
24 VDD4 Power Supply
25 VDD3 Power Supply
26 AVDD Analog Power Supply
27 RO OUTPUT VCO output for internal PLL.
28 LP OUTPUT
Connection pin to loop filter for internal
PLL.
29 AGS INPUT Analog sense pin for internal PLL.
30 AVSS Analog Ground
31 VSS3 Ground
32 VSS5 Ground
33 NC Reserved. It should be open.
34 nEXTOD INPUT
Port EXT. Open-drain mode (0:open-
drain output, 1:normal output) Pull-up
35 nMBE INPUT Port EXT. Noise cut (0:on, 1:off) Pull-up
36 nMBB INPUT Port A0/A1 Noise cut (0:on, 1:off) Pull-up
37 nMBA INPUT Port B0/B1 Noise cut (0:on, 1:off) Pull-up
38 nBJE INPUT
Port EXT. Jitters correct mode (0:big
jitters mode, 1:normal mode) Pull-up
39 nBJB INPUT
Port A0/A1 Jitters correct mode (0:big
jitter mode, 1:normal mode) Pull-up
40 nBJA INPUT
Port B0/B1 Jitter correct mode (0:big
jitter mode, 1:normal mode) Pull-up
41 VSS6 Ground
42 nRST INPUT Internal reset signal (active Low) Pull-up
43 nCKOEN INPUT Enable of CKO output. Pull-up