Hi, can you have a look at below problem related to BIST used by on of my customers:
He cannot run the BIST test FPDLINKIII over coax cable, this is my setup:
SER: DS90UB913A
DESER: DS90UB914A
At start-up:
SER
Pin 8 (MODE) = PCLK from imager sensor
PCLK is not present (because the sensor image is reset)
DESER
Pin 37 DESER (MODE) = 12bit LOW frequency
Pin 48 DESER (LOCK) = high (because the serializer selected the internal oscillator 25MHz@12bit LOW frequency when PCLK not present)
through the Analog LaunchPAD (release 1.56.001) I enable the BIST test setting the follow register:
ADDRESS=0x24 DESER (BIST CONTROL) = 0x03 value i.e.
BIST PIN CONFIG = bist configured through register bit
BIST CLOCK SOURCE = 50MHz @12bit LOW frequency
BIST _EN = ON
He verified that the test is working with the oscilloscope.
Hi tried to disturb the link cable with a capacitor in parallel between R+ and GND on DESER, I also tried disconnecting the cable but the value of BIST ERROR COUNT register (ADDRESS=0x25 DESER) remain to zero.
He tried to configure the BIST test even via hardware mode (DESER pin BIST_EN=1, GPIO0=0 and GPIO1=1) but the result is the same.
How can he make the BIST procedure correctly? Why the BIST ERROR COUNT register (ADDRESS=0x25 DESER) remain to zero?? How can Ihesimulate an error during BIST test to verify the counter increment??
