Today I tried to solder PSRAM chips (APS6404L) onto a Teensy 4.1 board. Both chips did not work, but seem to be defect. The following error messages were reported while testing the memory:
First Chip error Message:
15:17:05.580 -> EXTMEM Memory Test, 8 Mbyte
15:17:05.580 -> CCM_CBCMR=B5AE8304 (88.0 MHz)
15:17:05.580 -> testing with fixed pattern 5A698421
15:17:05.907 -> Error at 70000000, read 18098001 but expected 5A698421
De-soldering the first one and soldering the second one onto the same (small) pad on the Teensy.
Second Chip error message:
17:39:11.481 -> EXTMEM Memory Test, 0 Mbyte
I tested the Teensy 4.1 before soldering anything. It showed no defect and error.
I recently soldered PSRAM Chips from a different manufacturer onto another Teeny 4.1 board. This work without any problem.
Any idea or similar experience?
Thanks
Georg
First Chip error Message:
15:17:05.580 -> EXTMEM Memory Test, 8 Mbyte
15:17:05.580 -> CCM_CBCMR=B5AE8304 (88.0 MHz)
15:17:05.580 -> testing with fixed pattern 5A698421
15:17:05.907 -> Error at 70000000, read 18098001 but expected 5A698421
De-soldering the first one and soldering the second one onto the same (small) pad on the Teensy.
Second Chip error message:
17:39:11.481 -> EXTMEM Memory Test, 0 Mbyte
I tested the Teensy 4.1 before soldering anything. It showed no defect and error.
I recently soldered PSRAM Chips from a different manufacturer onto another Teeny 4.1 board. This work without any problem.
Any idea or similar experience?
Thanks
Georg