X-Engine TVG

Block: X-Engine TVG (xeng_tvg)
Block Author: Jason Manley
Document Author: Jason Manley

Contents

Summary
Mask Parameters
Ports
Description

Summary

Basic test vector generator for CASPER X-engines.

Mask Parameters

Parameter	Variable	Description
Number of Antennas (2ⁿ)	ant_bits	Bitwidth of the number of antennas in the system.
Bitwidth of Samples in	bits_in	Bitwidth of component of the input.
X integration length (2ⁿ)	x_int_bits	Bitwidth of X-engine accumulation length.
Sync Pulse Period (2ⁿ)	sync_period	Bitwidth of number of valids between sync pulses.

Ports

Port	Dir	Data Type	Description
tvg_sel	in	ufix_2_0	TVG selection. 0=off (passthrough), 1-3=TVG select.
data_in	in	inherited: bits_in*4	Data in for passthrough.
valid_in	in	boolean	Valid in made available for passthrough.
sync_in	in	boolean	Sync in made available for passthrough.
data_out	out	inherited: bits_in*4	???
sync_out	out	boolean	???
valid_out	out	boolean	???

Description

This block generates data in a format suitable for input to a CASPER X-engine. The tvg_sel line selects the TVG. If set to zero, it is configured for passthrough and all input signals are propagated to the output (TVG is off). Values one through three select a TVG pattern. In this case, sync pulses are generated internally and valid data is output all the time. The three patterns are as follows:

Inserts a counter representing the antenna number. All real values count up from zero and imaginary values counting down from zero. ie., antenna four would have the value 4 − 4i inserted.
Inserts the same constant for all antennas: Pol_1real = 0.125, Pol_1imag = − 0.75, Pol_2real = 0.5 and Pol_2imag = − 0.25
User selectable values for each antenna. Input registers named tv0 through tv7 are input cyclically. Each value is input for x_int_bits clocks.