SN54HCT373

更新时间： 2024-11-19 23:03:03

品牌	Logo	应用领域
德州仪器 - TI		锁存器输出元件
页数	文件大小	规格书
18页	244K
描述
OCTAL TRANSPARENT D-TYPE LATCHES WITH 3-STATE OUTPUTS

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SN54HCT373 数据手册

AN295

USB AUDIO CLASS TUTORIAL

1. Introduction

Isochronous data transfers can be used by universal serial bus (USB) devices designed to transfer data to or from

a host at a constant rate. Systems streaming audio employ isochronous transfers to transmit audio signals in real-

time. Silicon Laboratories microcontrollers’ robust USB peripheral supports isochronous transfers, and each

family’s assortment of additional high quality peripherals make them excellent single-chip solutions for USB-based

embedded system designs.

This document contains the following:

A USB protocol overview concentrating on isochronous transfers

A Firmware Template that provides a starting point for custom USB Audio Class device firmware

An example system illustrating requirements and operation of USB Audio Class devices

1.1. Overview

The first section of this application note discusses the key points of the USB specification that must be followed by

all USB devices, as well as isochronous transfer protocol requirements. The second section introduces the

Firmware Template for USB Audio Class devices. The last section discusses an example USB Audio Class device.

The example shows an Audio Class device that streams a sine wave to the host.

2. USB, Isochronous Transfers, and the Audio Class

The USB communications protocol outlines specifications for a reliable and fast system of data transfer between a

peripheral and a host such as a PC. The protocol defines four different data transfer types (bulk, interrupt, control,

and isochronous), each with unique characteristics and uses. USB device classes employ transfer types that suit

the needs of particular applications and systems. The USB Audio class uses the isochronous transfer type to

stream audio across a USB link.

2.1. USB Operational Overview

When a USB device connects to a USB port, the host controlling the port retrieves information about the

capabilities of a device through control transfers during a process called enumeration. Devices format this

information into descriptors. USB Specification documents define the structure of descriptors.

USB devices send and receive data through endpoints. All USB devices must have one control endpoint through

which all enumeration data travels. Descriptors read during enumeration describe the device’s other endpoints,

their data flow direction, maximum packet size, transfer type, and other characteristics used after enumeration

successfully completes.

After examining the device’s descriptors, the host determines how to communicate with the device. If the host can

allocate resources (data bandwidth, power) requested by the device, then enumeration completes successfully and

the host begins operations communication with the device. During operations communications, transfer methods

such as those using isochronous endpoint transfers take place.

2.2. Isochronous Transfer Characteristics

The host guarantees bandwidth to isochronous endpoints. This bandwidth guarantee is a feature unique to

isochronous endpoints. The amount of bandwidth allocated to a particular isochronous endpoint is determined by

information requested by that endpoint’s descriptor. Data transfers take place inside USB data frames. For Full

Speed USB devices such as the Silicon Laboratories C8051F32x, a data frame spans 1 millisecond. A device can

be configured to transmit as few as 1 byte per frame or as many as 1023 bytes per frame.

Rev. 0.1 6/06

AN295

12 3 4 5 6 7...18

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SN54HCT373 替代型号

型号	品牌	替代类型	描述	数据表
SN74HCT373	TI	功能相似	OCTAL TRANSPARENT D-TYPE LATCHES WITH 3-STATE OUTPUTS

与SN54HCT373相关器件

型号	品牌	获取价格	描述	数据表
SN54HCT373FH	TI	获取价格	D Flip-Flop
SN54HCT373FK	TI	获取价格	OCTAL TRANSPARENT D-TYPE LATCHES WITH 3-STATE OUTPUTS
SN54HCT373FK-00	TI	获取价格	HCT SERIES, 8-BIT DRIVER, TRUE OUTPUT, CQCC20
SN54HCT373FKR	TI	获取价格	HCT SERIES, 8-BIT DRIVER, TRUE OUTPUT, CQCC20, CERAMIC, LCC-20
SN54HCT373J	TI	获取价格	OCTAL TRANSPARENT D-TYPE LATCHES WITH 3-STATE OUTPUTS
SN54HCT373J-00	TI	获取价格	HCT SERIES, 8-BIT DRIVER, TRUE OUTPUT, CDIP20
SN54HCT373-SP	TI	获取价格	具有三态输出的八路 D 类透明锁存器
SN54HCT373W	TI	获取价格	OCTAL TRANSPARENT D-TYPE LATCHES WITH 3-STATE OUTPUTS
SN54HCT374	TI	获取价格	OCTAL EDGE-TRIGGERED D-TYPE FLIP-FLOPS WITH 3-STATE OUTPUTS
SN54HCT374_07	TI	获取价格	OCTAL EDGE-TRIGGERED D-TYPE FLIP-FLOPS WITH 3-STATE OUTPUTS

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