mclk now generated by ps not axi clkgen ip. ADAU1761 expects a free
running clock and the i2s driver was switching the axi clkgen ip off
which was causing issues.
In Subclass 1 mode, we need to use a separate clock (device clock) to
drive the link and transport layer of the interface. Implement the
required infrastructure for this scenario.
The clock domain crossing will be done in by the TX|RX_FIFO in the PCS.
In Subclass 1 mode an external device clock (core clock) is used,
instead of the PCS output clock, to drive the link and transport layer.
Define an additional parameter, which can be used to enable clock input
port for the PHY module, which can be used as rx|tx_coreclkin source.
This commit reverts part of the changes done in the following commit:
- ff50963c7f -
"axi_ad9361- altera/xilinx reconcile- may be broken- do not use"
The above mentioned commit introduced latency variations on the Rx path
at different sample rates, or within the same sample rate after sample
rate changes. The variation is caused by multiple positions of the frame
detection combined with a free running toggle (rx_valid) that is not synchronized
with the actual samples.
Having a single frame detection position eliminates the latency
variation.
When having multiple 936x in parallel, this change enables the use of source
synchronous received clock from the master as sampling clock for other slaves.
This will eliminate skew between the interfaces since the data delays
are going to be tuned against the master clock after a multi-chip
synchronization (MCS) is done. This eliminates the clock crossing from
the slave to master domain inside the FPGA.
Sync the two valid signals to keep a fixed phase relationship between
the Rx ant Tx channels, this way avoiding +/- 1 sample differences
on the Tx-Rx latency between consecutive transfers.
The pulse period had a fixed value. Therefore, in order to be able
to configure it from the software, a 32b register pulse_period_reg
was added in axi_spi_engine. Also, to generate the pulse, the
output register pulse_gen_loadc was added.
Cleanup placement constraints and let the tool have more freedom to
place and route the design. This is possible only after balancing the
memory and system clocks.
Minimize skew on synchronous CDC timing paths between clocks originating
from the same MMCM source. (sys_mem_clk and sys_cpu_clk)
This is required mostly by the smart interconnect.
The CLOCK_DELAY_GROUP property must be applied directly to the output net of BUFGs.
- Add parameter for input data delay time to easily match the one of the
adc_trigger.
- Change the trigger delay path to match between the internal and
external(adc_trigger delays).
"prepare_incremental_compile" is defined as a phony target, but is also a
prerequisite of a real target. This will lead to a complete project build
every time make is called.
To fix the issue the functionality of prepare_incremental_compile target
was included in the generic project build target.
The ready signal of the SYNC interface should be always 1'b1,
regardless of ASYNC_SPI_VALUE.
Drive the ready with one in both branches of the ASYNC_SPI_CLK
generate block.
Istvan Csomortani
Stanca Pop
AndreiGrozav
Laszlo Nagy
Arpadi
StancaPop
István Csomortáni