To enable trust architecture in T2080, Recommendation is PROG_SFP status to be changed from 1.8 V to GND based on T2080 datasheet (pg 50) Figure 8. PROG_SFP timing diagram.
How to handle this change of state for PROG_SFP from hardware?
Fuse programming voltage PROG_SFP should be applied for fuse programming purpose only. Fuse programming voltage PROG_SFP must be =GND at power up, and applied only after required minimum delay (see Table 5)
After fuse programming is completed, PROG_SFP is required to return back to GND before system is powered down or PORESET is asserted.
Still not clear with the implementation of PROG_MTR, PROG_SFP section.
As per Figure 8 and Table 5. PROG_SFP shall be changing state based on PORESET_B and Completion of fuse programming.
Is there any status / indication to intimate that fuse programming is completed so that by using external board components i can bring the value of 1.8V signal to 0V. Please confirm.
Also please confirm on state of PROG_MTR signal. This should be connected to GND whether trust architecture is in-use or not?