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C6747 EDMA interrupt problems

Hello,
I'm testing the C6747 EDMA AB-Sync transfering.
Senario:
 Copy 40 bytes from one array to another.
 ACNT = 1, BCNT = 4, CCNT = 10.
 Use Timer12(32-bit unchained mode) as an event to trigger edma transfer.
 Both EDMA intermediate interrupt and completion interrupt is enabled.

When I activated the timer12, the 40-byte data was copied, but non of the interrupts was triggered.
When I set the correponding bit in ESR instead of using timer12, all the 40-byte data was copied, and all the interrupts were triggered.
Why it happened? How can I receive all the interrupts by using timer12?

Regards
Kevin