GBT and transceiver related methods

Functions
u_int	FlxCard::gbt_setup (int alignment, int channel_mode)
long int	FlxCard::gbt_version_delay (u_long svn_version, char *filename)
u_long	FlxCard::rxusrclk_freq (u_int channel)
u_long	FlxCard::txusrclk_freq (u_int channel)
void	FlxCard::gth_rx_reset (int quad=-1)

Detailed Description

A set of functions for setting up GBT links.

Function Documentation

gbt_setup()

u_int FlxCard::gbt_setup	(	int	alignment,
		int	channel_mode )

Is used to initialize the GBT Wrapper registers, and to perform the TX and RX configuration.

Errors In case of an error, an exception is thrown.

Parameters

alignment	Tx time domain crossing mode selection for each channel (GBT TX_TC_METHOD)
channel_mode	Set GBT mode (normal FEC or Wide-bus mode) for all channels. (GBT_DATA_TXFORMAT, GBT_DATA_RXFORMAT)

gbt_version_delay()

long int FlxCard::gbt_version_delay	(	u_long	svn_version,
		char *	filename )

Is used to load the tx phase values from a file, for subsequent configuration of the registers GBT_TX_TC_DLY_VALUE1 to GBT_TX_TC_DLY_VALUE4 before the GBT initialization.

Errors In case of an error, an exception is thrown.

Parameters

svn_version	The current SVN (old) of GIT (new) version
filename	The file to load the tx phase values from

rxusrclk_freq()

u_long FlxCard::rxusrclk_freq

(

u_int

channel

)

This function will select the channel through the register RXUSRCLK_FREQ_CHANNEL. Then it will wait for the register RXUSRCLK_FREQ_VALID to go high, indicating that the measurement is done. The return value will be read from RXUSRCLK_FREQ_VAL and it represents the measured frequency in Hz.
Errors In case of an error, an exception is thrown; if the functionality has not (yet) been implemented in the FPGA firmware, the function throws a TIMEOUT exception. This also happens when a non-existing channel is selected.

Parameters

channel	The transceiver channel number on which the recovered receiver clock (rxusrclk) has to be measured
value	Frequency of the recovered receiver clock of the selected channel in Hz

txusrclk_freq()

u_long FlxCard::txusrclk_freq

(

u_int

channel

)

As function rxusrclk_freq(), but here applies to transmitter clocks (TXUSRCLK).

gth_rx_reset()

void FlxCard::gth_rx_reset

(

int

quad = -1

)

Resets the GTH receivers. It method is meant for FULL mode F/W only.

Parameters

quad	The quad to be reset; legal values are 0..5