SAMA5D2 datasheet(20/74 Pages) ATMEL

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SAMA5D2 Xplained Ultra [USER GUIDE]

Atmel-44028C-ATARM-SAMA5D2-Xplained-Ultra-User Guide_13-Oct-16

5.3.6

Additional Memories

5.3.6.1

Serial Data Flash

The SAMA5D2 provides two high-speed Serial Peripheral Interface (SPI) controllers. One port is used to interface

with the on-board serial DataFlash.

The four main signals used in the SPI are Clock, Data In, Data Out, and Chip Select. The SPI is a serial interface

similar to the I

2C bus interface but with three main differences:



It operates at a higher speed.



Transmit and receive data lines are separate.



Device access is chip select-based instead of address-based.

Figure 5-15.

Serial DataFlash

5.3.6.2

QSPI Serial Flash

The SAMA5D2 provides two Quad Serial Peripheral Interfaces (QSPI). One port is used to interface with the optional

on-board QSPI serial DataFlash.

The Quad SPI Interface (QSPI) is a synchronous serial data link that provides communication with external

devices in Master mode.

The QSPI can be used in SPI mode to interface to serial peripherals (such as ADCs, DACs, LCD controllers, CAN

controllers and sensors), or in Serial Memory mode to interface to serial Flash memories.

The QSPI allows the system to execute code directly from a serial Flash memory (XIP) without code shadowing to

RAM. The serial Flash memory mapping is seen in the system as other memories (ROM, SRAM, DRAM,

embedded Flash memory, etc.).

With the support of the Quad SPI protocol, the QSPI allows the system to use high-performance serial Flash

memories which are small and inexpensive, in place of larger and more expensive parallel Flash memories

Figure 5-16.

Optional QSPI Serial DataFlash

SPI0_CS0_PA17

VDD_3V3

SPI0_MOSI_PA15

[7]

SPI0_MISO_PA16

[7]

SPI0_SPCK_PA14

[7]

C53

100nF

AT25DF321A

HOLD

GND

VCC

SCK

QSPI0_CS

VDD_3V3

QSPI0_SCK_PA22

[7]

QSPI0_IO0_PA24

[7]

QSPI0_IO1_PA25

[7]

QSPI0_IO2_PA26

[7]

QSPI0_IO3_PA27

[7]

C52

100nF

U10

DNP(N25Q128A13ESE40F)

DQ0

DQ1

W#/VPP/DQ2

HOLD#/DQ3

VCC

Vss

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