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ad_ip_jesd204_dac_tpl: hw.tcl: Add framer input information parameters 

The exact layout of the input data into the DAC transport layer core
depends on the framer configuration. The number of input channels is
always equal to the NUM_CHANNELS parameter, but the number of samples per
channel per beat depends on the ratio of number of lanes, number of
channels and bits per sample.

It is possible to compute this manually, but this might require in-depth
knowledge about how the JESD204 framer works. Add read-only parameters that
display the number of samples per channel per beat as well as the total
width of the channel data signal.

This information can also be queried in QSys scripts and used to
automatically configure the input pipeline. E.g. like the upack core:

  set NUM_OF_CHANNELS  [get_instance_parameter_value jesd204_transport NUM_CHANNELS]
  set CHANNEL_DATA_WIDTH [get_instance_parameter_value jesd204_transport CHANNEL_DATA_WIDTH]

  add_instance util_dac_upack util_upack
  set_instance_parameter_values util_dac_upack [list \
    CHANNEL_DATA_WIDTH $CHANNEL_DATA_WIDTH \
    NUM_OF_CHANNELS $NUM_OF_CHANNELS \
  ]

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
main
Lars-Peter Clausen 2018-08-08 11:31:35 +02:00 committed by István Csomortáni
parent e502f94103
commit 5dcdc5198b
1 changed files with 30 additions and 2 deletions
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32
library/jesd204/ad_ip_jesd204_tpl_dac/ad_ip_jesd204_tpl_dac_hw.tcl
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@ -124,6 +124,33 @@ ad_ip_parameter OCTETS_PER_FRAME INTEGER 1 false [list \
GROUP $group \
]
set group "Framer Input Information"
# Parameters in this group are informative only and can be read back after the
# core has been configured to find out the expected layout of the input data.
# E.g.
# set NUM_OF_CHANNELS [get_instance_parameter_value jesd204_transport NUM_CHANNELS]
# set CHANNEL_DATA_WIDTH [get_instance_parameter_value jesd204_transport CHANNEL_DATA_WIDTH]
#
# add_instance util_dac_upack util_upack
# set_instance_parameter_values util_dac_upack [list \
# CHANNEL_DATA_WIDTH $CHANNEL_DATA_WIDTH \
# NUM_OF_CHANNELS $NUM_OF_CHANNELS \
# ]
ad_ip_parameter SAMPLES_PER_CHANNEL INTEGER 1 false [list \
DISPLAY_NAME "Samples per Channel per Beat" \
DERIVED true \
GROUP $group \
]
ad_ip_parameter CHANNEL_DATA_WIDTH INTEGER 1 false [list \
DISPLAY_NAME "Channel Data Width" \
UNITS bits \
DERIVED true \
GROUP $group \
]
set group "Datapath Configuration"
ad_ip_parameter DATAPATH_DISABLE boolean 0 true [list \
@ -181,8 +208,6 @@ proc p_ad_ip_jesd204_tpl_dac_validate {} {
set S_manual [get_parameter_value "SAMPLES_PER_FRAME_MANUAL"]
set enable_S_manual [get_parameter_value "ENABLE_SAMPLES_PER_FRAME_MANUAL"]
set channel_bus_width [expr 32 * $L / $M]
# With fixed values for M, L and N' all valid values for S and F have a
# constant ratio of S / F. Choose a ratio so that S and F are co-prime.
# Choosing values for F and S that have a common factor has higher latency
@ -233,6 +258,9 @@ proc p_ad_ip_jesd204_tpl_dac_validate {} {
set_parameter_property SAMPLES_PER_FRAME VISIBLE [expr !$enable_S_manual]
set_parameter_property SAMPLES_PER_FRAME_MANUAL VISIBLE $enable_S_manual
set_parameter_value SAMPLES_PER_CHANNEL [expr 4 * $S / $F]
set_parameter_value CHANNEL_DATA_WIDTH [expr 16 * (4 * $S / $F)]
set data_path_enabled [expr ![get_parameter_value DATAPATH_DISABLE]]
set cordic_enabled [expr $data_path_enabled && [get_parameter_value DDS_TYPE] == 1]