Altera Transceiver SI - Manual (Page 34)

A–6 Getting Started User Guide Altera Corporation
Transceiver Signal Integrity Development Kit, Stratix II GX Edition June 2006
Write and Read PMA Values
Write and Read
PMA Values This section walks you through setting up the example design’s write and
read PMA values.
Write PMA Values
Use the following steps to set up the example design:
1. Set read_write_PMA_control (DIP_sw[0]) to the closed
position.
2. Set PMA_controls (DIP_sw[3,2,1]) DIP switch to preemphasis,
VOD, equalization, or DC gain settings.
f
Refer to “DIP Switches” on page A–3 for the values.
3. Assert Change_PMA_switch push button switch (S3) to change the
value of selected PMA_control.
f
Refer to the “Push Button Switches” on page A–5 for more information.
4. Observe the values in the 7-segment display. The value written in
the transceiver is displayed.
1 The VOD values shown by the 7-segment display indicates the
value in mV when multiplied by 100. For example to show a
VOD of 200mV, the 7-segment display shows 02. This display
setting is for a VCCHTX of 1.5 V.
Read PMA Values
Use the following steps to set up the example design:
1. Set read_write_PMA_control (DIP_sw[0]) to the open position.
2. Set PMA_controls (DIP_sw[3,2,1]) DIP switch to preemphasis,
VOD, equalization, or DC gain settings.
f
Refer to “DIP Switches” on page A–3 for the values.
3. Observe the values in the 7-segment display. The value read from
the transceiver is displayed.