I am using an evk1100 and am interfacing a few SPI peripherals to the spare spi port (SPI0). I have removed 2 0R resistors from the NPCS1 and NPCS2 lines so that I can use those as well as NPCS0. The problem is that I want to add 1 more peripheral and the NCPS3 line is not available as it goes to the SD/MMC socket.
My question is can I use Peripheral Chip Select Decoding (set the PCSDEC bit in the MR register) and use just the NPCS0..2 lines to provide 7 chip selects? The documentation does not mention if this is a valid configuration.