参数资料
型号: AN2131QC
厂商: CYPRESS SEMICONDUCTOR CORP
元件分类: 微控制器/微处理器
英文描述: USB Controller(通用串行总线(USB)控制器)
中文描述: 8-BIT, 24 MHz, MICROCONTROLLER, PQFP80
封装: PLASTIC, QFP-80
文件页数: 7/16页
文件大小: 491K
代理商: AN2131QC
EZ-USB Series 2100
This diagram shows how conventional USB controllers handle a three-stage USB setup transaction called “Get
Descriptor.” The serial data flowing over the USB is shown as three stages: Setup, Data and Status. The
numbered arrows indicate transfers between the USB, endpoint FIFOs, and microprocessor memory. Significant
CPU overhead is required to transfer the data to and from the endpoint FIFOs (2,3,5) and to divide the
descriptor table data into packets for transmission using multiple USB data packets (4,6).
The EZ-USB core directly transfers setup packet data into a dedicated eight-byte Setup data buffer for CPU
inspection (1). Then the 8051 loads an EZ-USB pointer with the start address of the requested descriptor data
(2). The EZ-USB core does the rest. The EZ-USB core automatically takes care of error checking and retries,
dividing the table into packets for the various IN transfers and responding to the Status stage.
Comparison of Standard USB Request “ Get Descriptor”
Conventional Method
1
USB Setup data copied to
FIFO
2
CPU copies FIFO data to
RAM; decodes Get Descriptor
request
3
CPU transfers first packet of
data from memory to endpoint
FIFO
4
FIFO data sent in response to
USB IN token
5
CPU transfers next packet of
data from memory to endpoint
FIFO
6
FIFO data sent in response to
USB IN token
7
Repeat steps 5-6
EZ-USB Method
1
EZ-USB core copies Setup
data directly to RAM,
eliminating the FIFO-to-RAM
copy step. The 8051
decodes the Get Descriptor
request.
2
The 8051 sets pointer to
descriptor table in RAM.
EZ-USB core does entire
multi-packet transfer.
相关PDF资料
PDF描述
AN2131SC USB Controller(USB控制器)
AN2135SC USB Controller(通用串行总线(USB)控制器)
AN2136SC USB Controller(通用串行总线(USB)控制器)
AN2331QC USB Controller(通用串行总线(USB)控制器)
AN2325SC USB Controller(USB控制器)
相关代理商/技术参数
参数描述
AN2131SC 功能描述:IC MCU 8051 8K RAM 24MHZ 44QFP RoHS:否 类别:集成电路 (IC) >> 嵌入式 - 微控制器 - 特定应用 系列:EZ-USB® 产品变化通告:Product Discontinuation 26/Aug/2009 标准包装:250 系列:- 应用:网络处理器 核心处理器:4Kc 程序存储器类型:- 控制器系列:- RAM 容量:16K x 8 接口:以太网,UART,USB 输入/输出数:- 电源电压:1.8V, 3.3V 工作温度:- 安装类型:表面贴装 封装/外壳:208-LQFP 包装:带卷 (TR) 供应商设备封装:PG-LQFP-208 其它名称:SP000314382
AN2133 制造商:PANASONIC 制造商全称:Panasonic Semiconductor 功能描述:Video Camera Gamma Correction and AGC Circuits
AN2135S 制造商:未知厂家 制造商全称:未知厂家 功能描述:(1.49 M)
AN2135SC 功能描述:IC MCU 8051 8K RAM 24MHZ 44QFP RoHS:否 类别:集成电路 (IC) >> 嵌入式 - 微控制器 - 特定应用 系列:EZ-USB® 产品变化通告:Product Discontinuation 26/Aug/2009 标准包装:250 系列:- 应用:网络处理器 核心处理器:4Kc 程序存储器类型:- 控制器系列:- RAM 容量:16K x 8 接口:以太网,UART,USB 输入/输出数:- 电源电压:1.8V, 3.3V 工作温度:- 安装类型:表面贴装 封装/外壳:208-LQFP 包装:带卷 (TR) 供应商设备封装:PG-LQFP-208 其它名称:SP000314382
AN2136S 制造商:未知厂家 制造商全称:未知厂家 功能描述:(1.49 M)