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TMS320F28034: EQEP Problem

Part Number: TMS320F28034

Hi team,

my customer is using F28034 and they are now facing the problem:

QPOSILAT latch value is the current EQep1Regs.QPOSCNT value after normal encounter Z pulse (normal encounter Z pulse CNT value is near 0 or near 4095), but after the program runs for a while sometimes the latch value becomes a number that has been unchanged, please ask where is the problem. (For example, the cnt value is now 2000, encountered a Z pulse, the latch value became 2000, when the cnt value became 3000, encountered a Z pulse, the latch value is still 2000, to the later no matter how much the cnt value has become, after encountering Z latch value has been fluctuating around 2000). Thanks!