Interfacing "unmuxed" SRAM/Perpherials to STM32H742ZIT which only has muxed Addr/Data pins

[rfish.749]

Are there control signals available that would allow me to "unmux" the address/data lines using external latch? I need to use the LQPF144 package that doesn't provide the separate Address and Data pins - they are muxed.

[waclawek.jan · Accepted solution]

FMC_NL, confusingly called also NADV.

You may want to read the FMC chapter in RM.

JW

[berendi]

STM32H742ZIT can handle up to 26 address lines and 16 data lines without multiplexing. How much do you need, for what peripheral(s)?

Consult the pin/ball definition table in the datasheet. You'll find that all necessary pins, FMC_A0 through FMC_A25, FMC_D0 through FMC_D15, and the various control pins (find out which ones do you need from the memory/peripheral datasheet) all have a pin number in the LQFP144 column.

[rfish.749]

thanks

Berendi - i typed the wrong part number - I'm using the STM32H745, so the 144 pin package doesn't have separate addr/data pins.

JW - thanks - i missed the FMC_NL signal in the RM. Seems straight forward now.