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1 Commits (4bd45af739214d8659a4940485500ae508399ecd)

Author SHA1 Message Date
Matt Johnston 3775650df3 dmi_dtm_ecp5: Use ECP5 JTAGG for DMI 
This uses the JTAGG primitive which is similar to BSCANE2.
The LUT4 delay approach came from Florian and Greg in
https://github.com/enjoy-digital/litex/pull/1087

Has been tested on an OrangeCrab with 48MHz sysclk
FT232H up to 30MHz (though libusb/urjtag is by far the bottleneck vs
the JTAG clock)

Signed-off-by: Matt Johnston <matt@codeconstruct.com.au>
 4 years ago