Hello, TI employees.
I suspect the CC1310 High speed mode has a transmission error bug when data type is random & byte length in the packet is long.
During the test of HSM(high speed mode), the occurrence of packet error in the HSM is quite frequent even in the high SNR (RSSI : -15dBm).
The test condition is as below.
- CC1310 Rev.A (TX, RX)
- Test board : TI EVM board & our customized board. (same result)
- Center frequency : 915MHz
- Byte length in packet : 500 bytes
- RF connected directly using RF cable and attenuator (= no interference condition)
Notice : We have confirmed the same phenomenon occurs at the bands of 913MHz and 917MHz.
Also, the same in the CC1310 7XD Evaluation board.
<Test results - No error data type>
- all zeros, all ones, 0x01, 0xAA, 0xCC...
- some random pattern : seed17, 9, 100, 98, 97...
<Test results - error data type>
- packet error occur when using random data of seed 9, 17, 98
- measured PER is about 0.001 ~ 0.000001
<Error patern>
- packet error has some pattern
- (1) 40byte period - error position 37, 77, 117, 147...
- (2) allways last bit error
- (3) Increase error rate as data in the packet goes backward
<Detail error test result>
(randome data seed 17)
the position : 237, data expected : 94, data received : 95
277, data expected : 48, data received : 49
317, data expected : 96, data received : 97
(randome dataseed 100)
the position : 77, data expected : 94, data received : 95
(randome data seed 98)
the position : 397, data expected : 118, data received : 119
As you might have noticed something, the positions of error bytes are the specific points
and the errors are only one bit error. For the time limitation, we couldn't do the test
with more random seeds. But I think these results are enough to describe the situation we
are facing. We might have done the test wronlgy or your RF core may have a bug.
I don't know exactly why this is happening. A clear fact is that our video image is frequently
corrupted in the high speed mode. (the frequency is once in about 3 ~ 4 seconds.)
After seeing the above test results, please let me know how to fix the problem.
THANK YOU for your interest.
Best regards