Nations N32G45 Series, User Manual

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Nations Technologies Inc.
Tel
：
+86-755-86309900
Email
：
info@nationstech.com
Address: Nations Tower, #109 Baoshen Road, Hi-tech Park North.
Nanshan District, Shenzhen, 518057, P.R.China
Quad Serial Peripheral Interface (QSPI)
Introduction
QSPI is an interface for single,dual or quad SPI peripheral communication. It can work in indirect or memory mapped
modes.
Indirect Mode: All operations are performed using QSPI registers.
Memory Mapped Mode: The external flash memory is mapped into the microcontroller address space, and the system
treats it as internal storage space.
QSPI Main features
The main features of the QSPI controller are as follows:

Support Single SPI/Dual SPI/Quad SPI mode. In Single mode, it supports standard SPI operation and can work
in half-duplex and full-duplex modes;

Support indirect mode and memory mapped mode;

8-bit, 16-bit, 32-bit data access mode support;

Support Individual RX FIFO and TX FIFO that are depth is 32 and width is 32bit;

Support DMA operation;

Support FIFO interrupt, operation completion interrupt, data access error interrupt;

Maximum speed 4 × 36Mbps;

In indirect mode or memory-mapped mode, operations are divided into Instruction phase, Address phase, Mode
bits phase, wait cycles phase, and Data phase. These phase can be configured to be skipped, but at least one
phase remains.
Note: The Mode bits phase is only used in XIP mode.
Note: In XIP mode, only read operations are supported to external memory, and write operations are not supported.
Note: Only big endian mode is supported when reading external memory data in XIP mode.