I'm new to all of these. Is it possible to configure an 8-bit SDRAM to a 100TFLBGA LPC4370? Noticed there's only a single address pin BA0 (EMC_A13) on the 100pin package.
It's possible to connect an 8-bit SDRAM device, shown in Fig 63 in the User Manual.
As you can't cascade devices to a 16-bit or even 32-bit wide memory, you don't need a second Bank Activate pin, you just have one bank available --> one pin.
There are two chip selects EMC_DYCS[1:0] available, so in fact you could connect two 8-bit SDRAM devices.
Thank you, Bernhard Fink! That's very helpful. Most of the 8-bit SDRAMs (IS42S83200G) has a DQM pin but I don't see any recommended connection on the LPC4370's user manual and AN11508 Application Note also, EMC-DQMOUT[3:0] are only available on the LBGA256 package. Can I leave this open on the SDRAM side?
as there is nothing to mask with an 8-bit data bus, the EMC doesn't need to provide such a signal to the SDRAM.
You can simply keep this input on the SDRAM in active state, which means LOW --> pulldown resistor.
If you want to have it flexible for some reason, you can connect a GPIO of the LPC4300 to this pin as well, together with a pulldown. Then you could control from the MCU side with the GPIO if the values on the data bus pins are ignored (= masked) from the SDRAM or accepted.
Thank you, Bernhard Fink. This answers my question!
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