STM32 QSPI Bank1 and Bank 2 usage

[MBair.1]

Hi All,

We are planning to use STM's STM32H750VB in our design.

We need 1 QSPI port from the MCU.

We saw in the reference manual following 2 things: 

1. In block diagrams (page 883) it is mentioned as if we can enable dual-flash mode (8 bits) and disable dual-flash mode (4 bits).

2. In QUADSPI main features section (section no. 23.2), it is mentioned like '8, 16, and 32-bit data accesses are allowed'

So whether we can use only 4 bits (either Bank1 or Bank2) or we should use all 8 bits (both Bank1 & Bank2) ?

What about chip select connection ?

Best Regards,

Madhusoodana Bairy

[Tesla DeLorean]

1 & 2 are about different things

Generally you'd pair them (dual) to improve the bandwidth. Works with a single chip select.

Check the H7 DISCO boards, definitely examples. See H750B-DK schematic

[MBair.1]

Thanks for your response clive1.

What about following statement in reference manual(section no. 23.2): "8, 16, and 32-bit data accesses are allowed"