Datasheet – SMSC TMC2005-JT User Manual
Page 6
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