Sorry, you need to enable JavaScript to visit this website.

MMP Errata query: Dual-parallel-QSPI working on RevB boards

Unsolved
7 posts / 0 new
simonhollis's picture
simonhollis
Junior(0)
MMP Errata query: Dual-parallel-QSPI working on RevB boards

Hi,

 

I have a query about your part AES-MMP-7Z045-G (Zynq Mini-Module Plus Kit).

 

We have received copies of both the RevB and RevC versions of this board.

 

Your errata document, Zynq Mini Module Plus Rev B Errata (AES-MMP-7Z045-G_revb_errata_v1_0.pdf), says in Section 3.1 that 'dual parallel QSPI flash' does not work on the RevB boards, but will be fixed in RevC boards.

 

In our tests, we see a working dual parallel QSPI configuration on BOTH RevB and RevC boards, and want to know if this is a random event that cannot be relied upon, or a documentation error.

 

Could you please provide more details about the expected error case for the RevB boards and how we can test for the failure mode outlined in the errata across RevB and RevC boards.

 

Many thanks,

Simon

npoureh's picture
npoureh
Moderator(4)
As far as we know, the Dual

As far as we know, the Dual-Parallel QSPI does not work on the Rev B boards and should not be relied on. Booting from Dual-QSPI on the Rev B board should hang. Please open the PS Configuration Wizard in VIvado and make sure you have indeed enabled the Dual-Parallel mode for the Rev B design.

simonhollis's picture
simonhollis
Junior(0)
Hi,

Hi,
Thanks for the quick reply. The Zynq PS is indeed enabled with dual-QSPI (screenshot below). We are also able to burn bitfiles > 16MB and verify successfully using the Xilink SDK Flash tool in dual-parallel QSPI mode. Further, we can write and read-verify up to 32MB of space in Linux, if booting Linux on the Zynq and mounting QSPI as a file-system. Since the individual flash chips are 16MB in size, this implies dual QSPI must be working.
Are you able to suggest a test that you expect to fail on the RevB boards for us to try?
Many thanks,
Simon

simonhollis's picture
simonhollis
Junior(0)
(No subject)
npoureh's picture
npoureh
Moderator(4)
I have not seen it ever work

I have not seen it ever work on the Rev B board, so we do not recommend it.

simonhollis's picture
simonhollis
Junior(0)
Hi, thanks for your

Hi, thanks for your suggestion on not using RevB for dual-flash mode. Can you please outline for us what changes were made between RevB and RevC?
From the schematics, it seems there were no changes relating to the flash and we'd like to understand the suitability of our existing MMP units for use in our products.

npoureh's picture
npoureh
Moderator(4)
Changes were made to the Rev

Changes were made to the Rev B PCB routing to correct the Dual-Parallel QSPI operation. The Rev B and Rev C schematics are identical.