Split up the different counters for better readability. Might synthesize down to slightly larger logic.

Signed-off-by: Laez Barbosa <[email protected]>

Moved shift register logic to separate module

Signed-off-by: Laez Barbosa <[email protected]>

Split path between sdo data input and sdo shift register, which includes a barrel shifter.

Signed-off-by: Laez Barbosa <[email protected]>

Signed-off-by: Laez Barbosa <[email protected]>

Switched SDO source control to software (memory-mapped register).

SDO data can now be clocked in independently from the offload trigger.
This allows lower latencies for executing transfers, since the data can be
obtained from the DMA before the trigger. It also better separates the command
path from the data path

Signed-off-by: Laez Barbosa <[email protected]>

Make the interconnect use an external signal for switching between
sources, so it becomes just a collection of muxes, reducing latency.
This signal is generated based on the software-controlled offload
enable, but is sourced from the offload module to avoid unnecessary
CDCs.

This commit makes the use of SYNC optional.

Signed-off-by: Laez Barbosa <[email protected]>

Signed-off-by: Laez Barbosa <[email protected]>