Delay the config fast strobes by 20ns to remove any timing issues.
Understand the 0x convention.
Allow gain setting to be split.
Get the pll synthesizing.
Work-around the xst-not-liking-the-product.
Buffer the config writes by a slow clock cycle, avoids a high-speed signal
dependency.
Flip the sign of the multifilter output.
This appears to avoid an xst bug synthesizing that accumulator.
Short cicuit the spi command loopback.
Full speed spi.
Put channel 3 over to the pll.
Slightly robustify the usb handling.
Back off the spi rate for now.
Update comments and tweak the shift to match the comments.
Give spi access to the pll internals.
rd command can print multiple registers.
tune can print the channels.
Bring out the signal level from the pll also.
Start of a pll status report.