Table 33-5. Glossary (continued)Term Definition• Quad pad: Quad line I/O with 4 bidirectional I/O lines, driven alternatively by the serial flashdevice or the QuadSPI• Octal pad: Octal line I/O with 8 bidirectional I/O lines, driven alternatively by the serial flashdevice or the QuadSPITransaction A transaction consists of all flags, data and signals in either direction to execute a command for anattached serial flash device. It is a combination of chip select, sclk, instruction code, address, mode-and/or dummy bytes, transmit and/or receive data.LUT Look-up table.33.3 External Signal DescriptionThis section provides the external signal information of the QuadSPI module.The following table lists the external signals belonging to the module in conjunction withthe different modes of operation.Table 33-6. Signal PropertiesSignalNameFunction Direction DescriptionPCSFA1 Peripheral Chip SelectFlash A1O This signal is the chip select for the serial flash device A1. A1 representsthe first of the two flash devices that share IOFA.PCSFA2 Peripheral Chip SelectFlash A2O This signal is the chip select for the serial flash device A2. A2 representsthe the second of the two flash devices that share IOFA.PCSFB1 Peripheral Chip SelectFlash B1O This signal is the chip select for the serial flash device B1. B1 representsthe first of the two flash devices that share IOFB.PCSFB2 Peripheral Chip SelectFlash B2O This signal is the chip select for the serial flash device B2. B2 representsthe second of the two flash devices that share IOFB.SCKFA Serial Clock Flash A O This signal is the serial clock output to the serial flash device A.SCKFB Serial Clock Flash B O This signal is the serial clock output to the serial flash device B.IOFA[7:0] Serial I/O Flash A I/O These signals are the data I/O lines to/from the serial flash device A. Referto Driving External Signals for details about the signal drive and timingbehavior. Note that the signal pins of the serial flash device may changetheir function according to the SFM Command executed, leaving them ascontrol inputs when Single and Dual Instructions are executed. Themodule supports driving these inputs to dedicated values. In single I/Omode, QuadSPI drives data on IOFA[0] and expects data on IOFA[1].IOFB[7:0] Serial I/O Flash B I/O These signals are the data I/O lines to/from the serial flash device B. Referto Driving External Signals for details about the signal drive and timingbehavior. Note that the signal pins of the serial flash device may changetheir function according to the SFM Command executed, leaving them ascontrol inputs when Single and Dual Instructions are executed. Themodule supports driving these inputs to dedicated values. In single I/Omode, QuadSPI drives data on IOFB[0] and expects data on IOFB[1].Table continues on the next page...External Signal DescriptionMWCT101xS Series Reference Manual, Rev. 3, 07/2019830 NXP Semiconductors
