QSPI_B in single IO mode(LS1046)

[Urmila_123]

Hi all,

We are planning to use QSPI-B of LS1046 in single IO mode. It was mentioned in LS1046ARM that QSPI_B_DATA_0 is used as O/P and QSPI_B_DATA_1 is used as I/P in such case. so, my doubt is how shall we terminate the remaining data lines of QSPI_B(DATA_3&4)? can we leave them unconnected as per AN5252?

Thanks in Advance!

[Pavel]

Use recommendation from the AN5252 Rev 2:

https://www.nxp.com/docs/en/application-note/AN5252.pdf

QSPI_B_DATA[0:2] - The functionality of these signals is determined by the RCW[IFC_GRP_D_EXT] bits of reset configuration word.

If this pin is not used, it should be programmed as GPIO and output.

QSPI_B_DATA[3] - The functionality of these signals is determined by the RCW[IFC_GRP_E1_EXT] bits of reset configuration word.

If this pin is not used, it should be programmed as GPIO and output.

These pins can be floated also since the Figure 27-2 in the LS1046a Reference Manual shows the following:

Single Pad Instructions - IOFx[3:2] - Driven all the time to logic level 1