The term “Queue Support” is used in this context to describe the functionality implemented for comfortable switching of the timing configuration of the QSPI frames, depending on the slave select signal which is to be activated. The main feature of the module is the possibility to take both the configuration and data to the TXFIFO, and to track down which TXFIFO entry is configuration, and which data. The QSPI module expects 32 basic configuration bits to be moved with one move (for example DMA move) from some on-chip general purpose RAM to the TXFIFO. These 32 configuration bits from the TXFIFO and the configuration bits from the 8 configuration extension registers ECONz contained in the QSPI module, define together the full configuration of the module. One extension register is used for two slave selects: ECON0 for SLSO0 and SLSO8, ECON1 for SLSO1 and SLSO9...

Figure 1. Queue support overview