TI中文支持网ti的工程师们，请问am437x的QSPI接口所支持的3-pin,4-pin,6-pin模式是不是只支持读？写只是一根线?另外am437x可以同时外挂两片ddr3，一片nandflash，一片sram吗?
Jian Zhou：
QSPI3种模式的描述很清楚啊：
Support for 3-, 4- or 6-pin SPI interface– 3-pin mode uses spi_dout as inout/spi_din not used– 4-pin mode for dual read uses spi_dout as in/spi_din as in– 6-pin mode uses spi_dout as in/spi_din as in/spi_qdin0 as in/spi_qdin1 as in
am437x可以同时外挂两片ddr3，一片nandflash，一片sram
