Product Information:
- Board Model:
- Flash Chip: Micro Serial Nor Flash chip
Issue: When performing a flash page program command, an issue occurs with data transmission from the TX buffer. The initial data transmission behavior exhibits anomalies before resuming normal operation.
- During the first transmission from the TX buffer, the first word of the data transmitted is 0, followed by valid data until the first time buffer is fully transmitted (16 words).
- the operation is repeated with smaller transmissions:
- 4 words at a time: The first word sent is 0, and the following three words contain the correct data. This pattern continues for four transmissions before normal operation resumes.
- 8 words at a time: The first word transmitted is 0, followed by seven words of correct data. This pattern continues for two transmissions before normal operation resumes.
Checking/Debugging:
- Cleared TX FIFO: Confirmed TX FIFO was cleared before initiating programming.
- Checked QSPI Flags:
- QSPI_FR[TBUF]: Indicates no underrun condition.
- TX Buffer Fill Level:
- QSPI_TBSR[TRBFL] correctly shows the TX buffer fill level, indicating no overflow.
- QuadSPI Status Checks:
- Reviewed QuadSPI_SR and QuadSPI_FR flags; all appear correct with no unexpected indicators.
Questions:
- What could be causing the initial 0 words in the transmission despite clearing the TX FIFO?
- Are there any additional configurations or flags to check to ensure proper transmission behavior from the start?
- Could this issue be related to any known hardware or firmware limitations or bugs?
