Hello, I have been refining my view of the diagnostics signals for the prupose of specifying the layout of the diagnostics interface. Look and tell me what you think. FREE RUNNING SIGNAL: 1. SMCLK the 132ns clock from the diagnostics interface. SEQUENCED SIGNALS PROGRAMMED IN A FIFO 1. SMRST the smqie reset signal. 2. SML1A the level 1 accept signal. 3. SMDTR the data transmit request. 4. SMWB0 5. SMWB1 the smqie write buffer numbers. 6. SMRB0 7. SMRB1 the smqie read buffer numbers. 8. STIMULUS TRIGGER the lvds stimulus trigger out. PLD GENERATED PULSES (synchronized with the clock) 1. SMRST the smqie reset signal (mode 2). 2. SML2R the level 2 reject (stops dtr's). 3. SMSTRB the load dac strobe. SIMPLE REGISTERED SIGNALS 1. SMCALEN1 calibrate enable 1 (alias SML1A for bypass mode) 2. MODESEL0 3. MODESEL1 mode select bits (normal, current inj ena, source mon, bypass) 4. SMCALEN2 calibrate enable 2 (alias SML2R for bypass mode) 5. through 20. SMDATA[15:0] dac data. 21. through 26. DIAGADR[5:0] diagnostic address lines. This considers SMXR Mode emulation and Bypass Diagnostics. Will this provide the intended functionality? Craig