RE: NRF53 QSPI signal with unexpected output

haakonsh — Tue, 09 Nov 2021 12:30:17 GMT

It could be a signal intergity issue, in that case we need an analog scope of the signals.

RE: NRF53 QSPI signal with unexpected output

Eric_Zheng — Mon, 01 Nov 2021 06:46:33 GMT

The output tranlated to bytes :

first part (between the first falling edge of qspi_clk and the first rinsing edge of it)

0x00 0x00 0x01 0x01 0x00 0x00 0x00 0x00 , 8 bytes

second part (between the second falling edge of qspi_clk and the second rinsing edge of it)

0xCC 0xCC 0xCD 0xDC ,4 Bytes

third part (which is the same as described in ps)

0x00 0x11 0x10 0x00 (it is 0x38h as the figure 129 in nrf53 ps ) , 0x00 0x00 0x38 0x00 0x01 0x02 0x03

forth part

0xAA 0xAA 0xAB 0xAB 0xAA 0xAA 0xAA 0xAA , 8 bytes

fifth part

0xAA 0xAA 0x8B 0x89 0x88 0x88 0x88 0x88 , 8 bytes

these are the output signals after I called nrfx_qspi_write, write length 4 in buffer {0x00,0x01,0x02,0x03,.....} to address 0x38 (in the codes above , line 34)

Only the third part is correct , others are unexpected or at least not specified in ps , maybe I did'nt configure the qspi correctly ? But the output signal length is way longer than specified in ps , so I'm confused .

If anyother infos are needed please tell me , thanks a lot for answering the question .

RE: NRF53 QSPI signal with unexpected output

haakonsh — Thu, 28 Oct 2021 11:33:52 GMT

It's a bit hard to tell from that scope, can you label the inputs for us?

Also, it looks like the clock signal on channel '1' has a fair bit of jitter, can you get an analog scope of it?