參數(shù)資料
型號: AN2131QC
廠商: CYPRESS SEMICONDUCTOR CORP
元件分類: 微控制器/微處理器
英文描述: USB Controller(通用串行總線(USB)控制器)
中文描述: 8-BIT, 24 MHz, MICROCONTROLLER, PQFP80
封裝: PLASTIC, QFP-80
文件頁數(shù): 7/16頁
文件大?。?/td> 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.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AN2131SC 功能描述:IC MCU 8051 8K RAM 24MHZ 44QFP RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器 - 特定應(yīng)用 系列:EZ-USB® 產(chǎn)品變化通告:Product Discontinuation 26/Aug/2009 標(biāo)準(zhǔn)包裝:250 系列:- 應(yīng)用:網(wǎng)絡(luò)處理器 核心處理器:4Kc 程序存儲器類型:- 控制器系列:- RAM 容量:16K x 8 接口:以太網(wǎng),UART,USB 輸入/輸出數(shù):- 電源電壓:1.8V, 3.3V 工作溫度:- 安裝類型:表面貼裝 封裝/外殼:208-LQFP 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:PG-LQFP-208 其它名稱:SP000314382
AN2133 制造商:PANASONIC 制造商全稱:Panasonic Semiconductor 功能描述:Video Camera Gamma Correction and AGC Circuits
AN2135S 制造商:未知廠家 制造商全稱:未知廠家 功能描述:(1.49 M)
AN2135SC 功能描述:IC MCU 8051 8K RAM 24MHZ 44QFP RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器 - 特定應(yīng)用 系列:EZ-USB® 產(chǎn)品變化通告:Product Discontinuation 26/Aug/2009 標(biāo)準(zhǔn)包裝:250 系列:- 應(yīng)用:網(wǎng)絡(luò)處理器 核心處理器:4Kc 程序存儲器類型:- 控制器系列:- RAM 容量:16K x 8 接口:以太網(wǎng),UART,USB 輸入/輸出數(shù):- 電源電壓:1.8V, 3.3V 工作溫度:- 安裝類型:表面貼裝 封裝/外殼:208-LQFP 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:PG-LQFP-208 其它名稱:SP000314382
AN2136S 制造商:未知廠家 制造商全稱:未知廠家 功能描述:(1.49 M)