VITESSE
SEMICONDUCTOR CORPORATION
Data Sheet
Family of Repeater/Retimer and Port
Bypass Circuits for Fibre Channel
VSC7127/VSC7129
Table 4: Pin Identification
Pin #
Name
Description
INPUT - Differential, internally biased to VDD/2.
4, 3
I1+, I1-
I2+, I2-
I3+, I3-
I4+, I4-
I0+, I 0-
I1+/I1- is the serial input to PBC1.
I2+/I2- is the serial input to PBC2.
I3+/I3- is the serial input to PBC3.
I4+/I4- is the serial input to PBC4.
I0+/I0- is the serial input to PBC0.
41, 40
35, 34
28, 27
10, 9
15, 16,
17, 18
14, 22
SEL1, SEL2
SEL3, SEL4
SEL0, SEL5
INPUT - TTL.
Port Bypass MUX SELect lines. A HIGH selects Ix. A LOW selects the
output of the previous internal device.
OUTPUT - Differential
7, 6
O1+, O1-
O2+, O2-
O3+, O3-
O4+, O4-
O0+, O0-
O1+/O1- is the serial output from MUX1.
O2+/O2- is the serial output from PBC port 1.
O3+/O3- is the serial output from PBC port 2.
O4+/O4- is the serial output from PBC port 3.
O0+/O0- is the serial output from PBC port 4.
44, 43
38, 37
31, 30
24, 25
INPUT - TTL
106.25MHz REFerence CLocK for the internal Clock Multiplier PLL.
NOTE: A reference clock must be provided to the REFCLK pin in order for
the chip to power up in the right state
13
12
REFCLK
MODE
INPUT - TTL
(NOTE: Different for VSC7127T or VSC7127R)
In the VSC7127T, MODE configures the part as a Retimer if LOW or a
Repeater if HIGH. In the VSC7127R, MODE configures the parts as a
Repeater if LOW or a Retimer if HIGH. If unused, tie HIGH or LOW.
20 (VSC7127)
19 (VSC7129
OUTPUT - TTL:
SIGnal DETect output
SIGDET
TRST
23 (VSC7127)
22 (VSC7129)
INPUT - TTL:
(Internal Pull-up Resistor)
Test mode input. Pull HIGH or leave open for normal operation.
2
21 (VSC7127)
20 (VSC7129)
VDD
Digital Logic Power Supply
5
VDDP1
VDDP2
VDDP3
VDDP4
VDDP0
Power Supply (3.3V) for O1+/-. If unused, connect to VSS
Power Supply (3.3V) for O2+/-. If unused, connect to VSS
Power Supply (3.3V) for O3+/-. If unused, connect to VSS
Power Supply (3.3V) for O4+/-. If unused, connect to VSS
Power Supply (3.3V) for O0+/-. If unused, connect to VSS
.
.
.
.
42
36
29
26
32
VDDA
Analog Power Supply
1, 8, 11, 33, 39
19 (VSC7127)
23 (VSC7129)
VSS
Ground
© VITESSE SEMICONDUCTOR CORPORATION • 741 Calle Plano • Camarillo, CA 93012
Tel: (800) VITESSE • FAX: (805) 987-5896 • Email: prodinfo@vitesse.com
Internet: www.vitesse.com
G52298-0, Rev 4.3
05/01/01
Page 9
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