QSPI boot mode supports a single flash (1-bit, 2-bit, or 4-bit data bus width configuration), dual stacked flash (4-bit data bus configuration), or dual-parallel flash (8-bit data bus configuration). The device supports a 24-bit addressing mode (QSPI24) boot mode or a 32-bit addressing (QSPI32) boot mode option. The QSPI32 boot mode option addresses flash sizes that are greater than 128 Mb. The single data rate (SDR) mode is used during the RCU BootROM execution. The PLM can reprogram the interface for faster accesses. For additional information on the quad SPI controller, see the Quad SPI Controller chapter.
For details on QSPI flash support, see the Vivado Design Suite User Guide: Programming and Debugging (UG908).
Boot Mode Setups
The following table lists the QSPI boot mode setups that are supported.
| Quad SPI Setup | Flash Device Count | Chip Select Count | Data Width Max |
|---|---|---|---|
| Single (1-bit, 2-bit, 4-bit) | 1 | 1 | 4 |
| Dual-stacked 1 (1-bit, 2-bit, 4-bit) | 2 | 2 | 4 |
| Dual-parallel (8-bit) | 2 | 2 | 8 |
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The boot mode image search limits are listed in Table 1.