CYUSB3014 datasheet(7/38 Pages) CYPRESS

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PRELIMINARY

CYUSB3014

Document Number 001-52136 Rev. *H

Page 7 of 38

JTAG Interface

EZ-USB FX3’s JTAG interface provides a standard five-pin

interface for connecting to a JTAG debugger to debug firmware

through the CPU-core's on-chip-debug circuitry.

Industry standard debugging tools for the ARM926EJ-S core can

be used for EZ-USB FX3 application development.

Other Interfaces

EZ-USB FX3 supports the following serial peripherals:

■ UART

■ I2C

■ I2S

■ SPI

The SPI, UART and I2S interfaces are multiplexed on the Serial

Peripheral port.

The Pin List on page 32 shows details of how these interfaces

are multiplexed.

UART Interface

The UART interface of EZ-USB FX3 supports full duplex

communication. It includes the signals noted in Table 1.

The UART is capable of generating a range of baud rates from

300 bps to 4608 Kbps selectable by the firmware.

I2C Interface

EZ-USB FX3 has an I2C interface compatible with the I2C Bus

Specification Revision 3. EZ-USB FX3’s I2C interface is capable

of operating as I2C Master only, hence may be used to

communicate with other I2C slave devices. For example,

EZ-USB FX3 may boot from an EEPROM connected to the I2C

interface, as a selectable boot option.

EZ-USB FX3’s I2C Master Controller also supports Multi-master

mode functionality.

The power supply for the I2C interface is VIO5, which is a

separate power domain from the other serial peripherals. This is

to allow the I2C interface the flexibility to operate at a different

voltage than the other serial interfaces.

The bus frequencies supported by the I2C controller are 100 kHz,

400 kHz, and 1 MHz. When VIO5 is 1.2V, the maximum

operating frequency supported is 100 kHz. When VIO5 is 1.8 V,

2.5 V or 3.3 V, the operating frequencies supported are 400 kHz

and 1 MHz.

Both SCL and SDA signals of the I2C interface require external

pull-up resistors. The pull-up resistors must be connected to

VIO5.

I2S Interface

EZ-USB FX3 has an I2S port to support external audio codec

devices. EZ-USB FX3 functions as I2S Master as transmitter

only. The I2S interface consists of four signals: clock line

(I2S_CLK), serial data line (I2S_SD), word select line (I2S_WS),

and master system clock (I2S_MCLK). EZ-USB FX3 can

generate the system clock as an output on I2S_MCLK or accept

an external system clock input on I2S_MCLK.

The sampling frequencies supported by the I2S interface are

32 kHz, 44.1 kHz, and 48 kHz.

SPI Interface

EZ-USB FX3 supports an SPI Master interface on the Serial

Peripherals port.The maximum frequency of operation is

33 MHz.

The SPI controller supports four modes of SPI communication

with Start-Stop clock. The SPI controller is a single master

controller with a single automated SSN control. It supports

transaction sizes from 4-bit to 32 bits long.

Boot Options

EZ-USB FX3 can load boot images from various sources,

selected by the configuration of the PMODE pins. The boot

options for EZ-USB FX3 are listed as follows:

■ Boot from USB

■ Boot from I2C

■ Boot from SPI (SPI devices supported are M25P16 (16 Mbit),

M25P80 (8 Mbit), and M25P40 (4 Mbit)) or their equivalents

■ Boot from GPIF II ASync ADMUX mode

■ Boot from GPIF II Sync ADMUX mode

■ Boot from GPIF II ASync SRAM mode

Table 1. UART Interface Signals

Signal

Description

Output signal

Input signal

CTS

Flow control

RTS

Flow control

Table 2. Booting Options for EZ-USB FX3

PMODE[2:0][2]

Boot From

F00

Sync ADMUX (16-bit)

F01

Async ADMUX (16-bit)

F11

USB boot

F0F

Async SRAM (16-bit)

F1F

I2C, On Failure, USB Boot is Enabled

1FF

I2C only

0F1

SPI, On Failure, USB Boot is Enabled

Note

2. F indicates Floating.

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