There are devices which have a asynchronous data ready signal. (asynchronous
with the spi clock) The CDC stages can be enabled by setting up
the ASYNC_TRIG parameter.
In case of high precision devices with just a simple SPI interface
for control and data, the effective data rate can be significatly
lower than the SPI clock, and more importantly there isn't any relation
between the two clock domain.
The rate is defined by a SOT (start of transfer) generator, which
initiates a SPI transfer. Taking the fact that the generator runs
on system clock (100 MHz), and the device can require smaller rate (in kHz domain),
the 7 bit dac_datarate register is just too small.
Therefor increasing to 16 bit.
This core can be used in conjunction with the SPI_ENGINE, will work
as an offload module, forwarding a data stream to the SPI excecution,
received from a DMA.
Calculate the output clock frequencies based on the input clock frequencies
and the default divider settings and configure the output clock pins
accordingly. This allows connected peripherals to infer the frequency of
the clock.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Instead of having to manually specify the input clock period infer the
values from the block design. This means that less configuration parameters
need to be changed if the clock input frequency changes.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Add interface definition for the input and output clocks. This will allow
the tools to recognize them as clocks and enable things like clock
frequency propagation.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
The secondary clock inputs and outputs of the axi_clkgen are rarely used.
Add enable parameters that need to be explicitly set before they are
available. This allows to hide the secondary clock pins when they are not
used in the block design.
There are currently no projects which use the secondary clock inputs or
outputs so there is no need to set these new parameters anywhere.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Vivado infers the type of floating point type parameters as integer if the
value can be expressed as an integer (i.e. decimal places are 0). To
correctly infer them as floating point parameters add types to the
parameter declaration.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Can not be multiple 'if' statements inside a generate block. If there are
multiple cases use if/esle statement, but always should be one single
if/else inside a generate.
When a mapping has multiple address segments we need to consider all of
them to calculate the required address width.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
The address width needs to be large enough to be able to address the
largest possible address. This means the in addition to the address segment
range the specified offset also needs to be considered to calculate the
address width.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
up_rdata is qualified by the up_rack signal. There is no need to reset it
since by the time the signal is read the reset value has already been
overwritten anyway.
Also gate the up_rdata registers if no read operation is in progress. In
this case any changes would be ignored anyway.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
The axi_adc_trigger does not use the full width of the AXI interface
address. It only responds to register access in the first 32 registers.
Reduce the size of the AXI address to 7 bit accordingly. This allows the
scripts to correctly infer the internal register map size which will cause
the interconnect to filter out access to these unused register.
This slightly reduces utilization by getting rid of some pipeline
registers.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
The axi_adc_decimate does not use the full width of the AXI interface
address. It only responds to register access in the first 32 registers.
Reduce the size of the AXI address to 7 bit accordingly. This allows the
scripts to correctly infer the internal register map size which will cause
the interconnect to filter out access to these unused register.
This slightly reduces utilization by getting rid of some pipeline
registers.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
The axi_dac_interpolate does not use the full width of the AXI interface
address. It only responds to register access in the first 32 registers.
Reduce the size of the AXI address to 7 bit accordingly. This allows the
scripts to correctly infer the internal register map size which will cause
the interconnect to filter out access to these unused register.
This slightly reduces utilization by getting rid of some pipeline
registers.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
The axi_logic_analyzer does not use the full width of the AXI interface
address. It only responds to register access in the first 32 registers.
Reduce the size of the AXI address to 7 bit accordingly. This allows the
scripts to correctly infer the internal register map size which will cause
the interconnect to filter out access to these unused register.
This slightly reduces utilization by getting rid of some pipeline
registers.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
The AXI DMAC peripheral only uses 11-bit of the register map interface
address. Reducing the signal width to this value allows the scripts to
correctly infer the size of the register map.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Not all peripherals need the full address space. To be able to infer the
size of the address space of a peripheral allow the size of the AXI address
signals to be configurable rather than hardcoding its width to 32 bit.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Currently the register map range of a peripheral is hardcoded to 64k. Not
all peripherals need that much space though and reducing the size of the
address can reduce the amount of logic required, both in the interconnect
as well as in the peripheral.
Let adi_ip_properties() infer the size of the register map from the number
of bits of the address when creating the register map.
For backwards compatibility limit the register map size to 64k since
currently peripherals have a address width of 32 bits, event if they use
less.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Currently the AXI address width of the DMA is always 32-bit. But not all
address spaces are so large that they require 32-bit to address all memory.
Extract the size of the address space that the DMA is connected too and
configure reduce the address size to the minimum required to address the
full address space.
This slightly reduces utilization.
If no mapped address space can be found the default of 32 bits is used for
the address.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
The delay_clk is only used internally when the IODELAYs are enabled. This
means the port has no function when the IODELAYs are disabled so hide the
port in that case.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Typically when a port has a enablement dependency it also should have a
tie-off value to the port is connected to when disabled.
Make it possible to specify this tie-off value when calling
adi_set_ports_dependency().
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
The output data mux is used to bypass the filter when it is not used. Which
setting is used for the mux depends on the 3-bit filter_mask signal.
Registering the control logic into a single bit signal reduces the amount
of routing resources required. Since changing the filter_mask settings is
asynchronous to the processing anyway the extra clock cycle delay
introduced by this change does not affect behaviour.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Move the processing pipeline of the axi_adc_decimate core to its own
sub-module. This makes it easier to simulate the processing independent of
the register map.
Also since the filter is two instances of the same logic, one for each
channel, let the new sub-module model one channel and instantiate it twice.
This allows to change the implementation without having to change the same
code twice.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
The output data of the decimation block is 16-bit signed. Properly sign
extend the 12-bit input signal when the filter is bypassed.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
The minimum number of bits required for the adders in a CIC filter depends
on the decimation rate. Higher decimation factors require more bits. This
means for a multirate filter the size of the logic structures is determined
by the highest supported rate.
The current implementation of the filter always uses all bits of the
structure to compute the results, that means even when running with the
lowest decimation factor all the bits that are required for the highest
decimation factor are used. This will work fine as additional bits do not
affect the output of the filter.
This patch implements dynamic partial gating of the filter structure based
on the selected decimation factor. Bits that are not required for a certain
rates are gated and the carry bits are masked from propagating through the
adder chain. This results in significant power savings at smaller
decimation factors.
This means that the filter itself is now using more power the higher the
decimation rate. But this is offset by the reduced data output rate running
subsequent processing stages at a lower rate and reducing power consumption
there. This results in a more or less flat power profile regardless of
decimation factor.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Allow to split a CIC int or comb block into multiple stages and be able to
dynamically gate some of the stages. Also prevent carry propagation in
gated stages to keep the adder output constant.
This is useful for multi-rate filter where not all bits are needed all the
time.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
The minimum decimation rate of the CIC block is five, this means data
arrives at the FIR filter at most every five clock cycles. The decimation
rate of the filter is two so the filter produces an output at most every
ten clock cycles. This allows for ten clock cycles to compute the result.
The current implementation of the filter uses a fully pipelined
architecture with one multiplier for each coefficient. Which then do work
for one clock cycle and sit idle for the next nine clock cycles.
Rework the filter to be sequential reducing the number of required
multipliers to one. In addition exploit the symmetric structure of the
filter to make use of the preadder reducing the required multiply
operations by two.
This significantly reduces the logic utilization of the filter as well as
moderately reduces power consumption.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
The minimum decimation of the CIC block is 5. This means new data arrives
at the comb stages at most every 5 clock cycles. Rather than letting the
logic sit idle during those 4 extra cycles use it to sequentially process
the comb stages of the filter. This reduces the logic utilization of the
filter by quite a bit.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
The output data mux is used to bypass the filter when it is not used. Which
setting is used for the mux depends on the 3-bit filter_mask signal.
Registering the control logic into a single bit signal reduces the amount
of routing resources required. Since changing the filter_mask settings is
asynchronous to the processing anyway the extra clock cycle delay
introduced by this change does not affect behaviour.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Re-implement the CIC using the basic building blocks from the util_cic
library.
This new implementation is structurally equivalent to the previous version,
but will be used as a platform for implementing changes that will improve
area and power consumtion of the filter
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Move the processing pipeline of the axi_adc_decimate core to its own
sub-module. This makes it easier to simulate the processing independent of
the register map.
Rejeesh Kutty
AndreiGrozav
Istvan Csomortani
Adrian Costina
Lars-Peter Clausen