Hardware Components
UG0048 User Guide Revision 5.1 12
The LVDS signals are terminated on J40 and J41 connectors so that a standard patch cable can be used
for doing loop-back testing. For schematic representation of connector signal details, see Figure 16,
page 35.
The four differential pairs (consisting of eight I/O pins) are terminated, as listed in the following table,
using the following color convention on the first RJ45 connector (referred to as CAT 5E Primary for the
purpose of differentiation).
Note: TXn+ refers to positive signal of the transmit side of balanced signal transmission.
Note: TXn– refers to negative signal of the transmit side of balanced signal transmission.
Note: RXn+ refers to positive signal of the receive side of balanced signal transmission.
Note: RXn– refers to negative signal of the receive side of balanced signal transmission.
The four differential pairs (consisting of eight I/O pins) are terminated, as listed in the following table,
using the following color convention on the second LVDS connector (referred to as l “CAT 5E
SECONDARY” for the purpose of differentiation).
Note: The colors refer to the colors that will appear on the CAT 5E cable. The pin numbers correspond to the
pin numbers of an RJ-45 connector. Note that the CAT-5E PRIMARY connections are labeled for the
purposes of what is regarded as standard connections for CAT-5E on Ethernet-type connectors. The
connections on the CAT-5E SECONDARY are reversed so as to allow a standard patch cable to check
loop-back on these LVDS signals.
A 1-foot CAT5 standard patch cable supplied with the ProASIC3/E Starter Kit can be used for LVDS
signals loop-back. Also note that the VCCI and VMV voltages of Bank6 and Bank7 (west side) are
Table 5 • Color Convention on CAT 5E Primary
Color Pin Signal
White/Orange
p1 TX1+
Orange p2 TX1–
White/Green p3 RX1+
Blue p4 TX2–
White/Blue p5 TX2+
Green p6 RX1–
White/Brown p7 RX2+
Brown p8 RX2–
Table 6 • Color Convention on CAT 5E Secondary
Color Pin Signal
White/Orange p1 RX3+
Orange p2 RX3–
White/Green p3 TX3+
Blue p4 RX4–
White/Blue p5 RX4+
Green p6 TX3–
White/Brown p7 TX4+
Brown p8 TX4–