Xeng_tvg - david-macmahon/wiki_convert_test GitHub Wiki
Block: X-Engine TVG (xeng_tvg)
Block Author: Jason Manley
Document Author: Jason Manley
Summary
Basic test vector generator for CASPER X-engines.
Mask Parameters
| Parameter | Variable | Description |
|---|---|---|
| Number of Antennas ((2^n)) | 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 ((2^n)) | x_int_bits | Bitwidth of X-engine accumulation length. |
| Sync Pulse Period ((2^n)) | 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: (\textrm{Pol}{1 real}=0.125), (\textrm{Pol}{1 imag}=-0.75), (\textrm{Pol}{2 real}=0.5) and (\textrm{Pol}{2 imag}=-0.25)
- User selectable values for each antenna. Input registers named
tv0throughtv7are input cyclically. Each value is input forx_int_bitsclocks.