Cannot detect MAX V cpld and Cyclonne 5GX in the same jtag chain

Hi @ak6dn I have just put a scope probe on the jtag pins of the MAXV, see attached. The first two pictures attached show the TCK (ch1) and TMS (ch2) during testing the jtag chain. The clock looks pretty good, this was a concern. Third picture shows TCK and TDI - does the device latch data on the rising edge of TCK ? Fourth picture shows TCK and TDO

So I never see any activity on the TDO output pin from the MAXV but when I test the JTAG chain in the Quartus Chain Debugger it still manages to detect the downstream 5CGX. How does it do this when the TDO line that feeds in to the TDI pin of the Cyclone has no activity on it ?

I have also checked all the VCC pins and all look good.