Altera DisplayPort MegaCore Function - Manual (Page 118)

Parameters: •
link_rate—
Link rate (Gbps): 0 = 1.62; 1 = 2.70; 2 = 5.40
•
lane_count
—1, 2, or 4
•
volt_swing—
0, 1, 2, or 3
•
pre_emph—
0, 1, 2, or 3
•
new_cfg—
0 = ignore the other parameters; 1 = use provided parameters
Description: This function performs fast link training with the connected DisplayPort sink.
When performing fast link training, the IP core outputs training pattern 1 for 1
ms followed by training pattern 2 for 1 ms. The function returns a 1 if link
training fails or if the DPCD flag
NO_AUX_HANDSHAKE_LINK_TRAINING
= 0 (at
location 00103h).
• If
new_cfg
= 1, the IP core updates the sink’s DPCD with the provided
link_
rate
and
lane_count
, sets its own transceiver with the provided
volt_swing
and
pre_emph
, and then performs fast link training.
• If
new_cfg
= 0, the IP core uses the current transceiver setting, link rate, and
lane count, and performs fast link training.
Example:
btc_dptx_fast_link_training(1, 4, 1, 0, 1);
Related Information
btc_dptx_link_training on page 8-17
btc_dptx_link_training
Prototype:
int btc_dptx_link_training(
unsigned int link_rate,
unsigned int lane_count)
Thread-safe: No
Available from ISR: Yes
Include:
< btc_dptx_syslib.h >
Return: 0 = success, 1 = fail
Parameters: •
link_rate—
Link rate (Gbps): 0 = 1.62; 1 = 2.70; 2 = 5.40
•
lane_count
—1, 2, or 4
Description: This function performs link training with the connected DisplayPort sink.
Example:
btc_dptx_link_training(1, 4);
UG-01131
2015.05.04
btc_dptx_link_training 8-17
DisplayPort API Reference Altera Corporation
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