LS1046A QSPI boot issue re: address bytes

ismk-1003123 — Mon, 07 Jul 2025 23:02:02 GMT

Hi I am having an issue booting from qspi. Our current custom board uses an Avalanche Tech QSPI MRAM for boot memory. Currently it seems like there might be a mismatch between the number of address bytes, as the Avalanche MRAM states that it only accepts a read command with 32-bit addresses (4 bytes) but I can't find any information on what the LS1046A transmits.

From forum posts it seems like other product lines that boot over QSPI only transmit 3-byte addresses.

Is it possible for the LS1046A to access the QSPI flash on boot using 4-byte addressing? Is there any good information on the physical interface on boot?

Thank you.

Re: LS1046A QSPI boot issue re: address bytes

yipingwang — Tue, 22 Jul 2025 03:12:01 GMT

The customer can refer Table 27-23 (reset sequence) under 27.6.3.4 Look-up Table section. It shows the default values of the LUT that is being programmed and transmitted by LS1046A.
It is not possible for the LS1046A to access the QSPI flash on boot using 4-byte addressing as during boot LS1046A boot ROM only supports 3-byte addressing.
Therefore customer is required to use QSPI memory that supports 3-byte addressing by default (or can boot in that mode).

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LS1046A QSPI boot issue re: address bytes

Re: LS1046A QSPI boot issue re: address bytes