Datasheet

FPD-Link Evaluation Kit User’s Manual
National Semiconductor Corporation
Rev 3.0
Date: 9/25/2007
Page 10 of 25
Tx Board Options: 50 Ohm Termination for TxIN
On the Tx demo board, the 29 inputs have an option for 50 Ohm terminations.
There are 0402 pads for this purpose. One side is connected to the signal line and
the other side is tied to ground. These pads are unpopulated from the factory but
are provided if the user needs to install a 50 Ohm termination. R1 TO R28 are
associated with the Tx data input lines. R29 is associated with CLKIN. Some test
equipment may require a 50 Ohm load.
Mapping of Transmitter Inputs for the Optional Termination Resistors is shown
below:
Tx Pin
Names
Tx Pin
Number
Termination
Resistor
TxIN0 51 R1
TxIN1 52 R2
TxIN2 54 R3
TxIN3 55 R4
TxIN4 56 R5
TxIN5 2 R6
TxIN6 3 R7
TxIN7 4 R8
TxIN8 6 R9
TxIN9 7 R10
TxIN10 8 R11
TxIN11 10 R12
TxIN12 11 R13
TxIN13 12 R14
TxIN14 14 R15
TxIN15 15 R16
TxIN16 16 R17
TxIN17 18 R18
TxIN18 19 R19
TxIN19 20 R20
TxIN20 22 R21
TxIN21 23 R22
TxIN22 24 R23
TxIN23 25 R24
TxIN24 27 R25
TxIN25 28 R26
TxIN26 30 R27
TxIN27 50 R28
TxCLKIN 31 R29
50 Ohm Termination
(Optional)
TX