SPI shares signals with eSDHC in way that prevents using 8-bit eMMC and SPI at the same time. Functionality of SPI_PCS[0-3]/SDHC_DAT[4-7] pins is determined by the configuration word (RCW). The RCW is read from some nonvolatile memory on power-on reset (PORESET) only. The PORESET causes the chip to abort all current internal and external transactions and set all registers to their default values.
SPI shares signals with eSDHC in way that prevents using 8-bit eMMC and SPI at the same time. Functionality of SPI_PCS[0-3]/SDHC_DAT[4-7] pins is determined by the configuration word (RCW). The RCW is read from some nonvolatile memory on power-on reset (PORESET) only. The PORESET causes the chip to abort all current internal and external transactions and set all registers to their default values.
