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Introduction to USB. 2 Agenda Introduction to USB LPC23xx Block diagram MCB2300 demo.

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Presentation on theme: "Introduction to USB. 2 Agenda Introduction to USB LPC23xx Block diagram MCB2300 demo."— Presentation transcript:

1 Introduction to USB

2 2 Agenda Introduction to USB LPC23xx Block diagram MCB2300 demo

3 3 Introduction to USB Plugging the USB cable Communication flow Lets talk about USB applications

4 4 USB- A Brief History USB 1.1USB 2.0OTG Approved on 11/23/99 by the USB Core team 12 Mbps bus Full-speed (12 Mbps) Low-speed (1.5 Mbps) Standard A connector and standard B connector Interrupt (OUT) Transfer was added Original USB 2.0 specification released on April 27, 2000 480 Mbps bus High-speed (480 Mbps) Full-speed (12 Mbps) Low-speed (1.5 Mbps) Backward compatible with USB 1.1 New mini-B connector Supplements the 2.0 specification Connects peripherals directly to each other (peer to peer) New mini-A connector and mini-AB receptacle

5 5 Plugging the USB Cable Bus enumeration –The process of identifying and configuring USB devices During enumeration: –Assigning an address –Reading “Descriptors” from device –Assigning and loading a device driver Host software responsibility

6 6 Descriptors Data Structure with a defined format that enables a host to learn about a device and its capabilities. Device Descriptor Configuration Descriptor Interface Descriptor Endpoint Descriptor

7 7 Introduction to USB Plugging the USB cable Communication flow Lets talk about USB applications

8 8 IN and OUT Transactions Data flows IN and OUT with respect to the host “IN Transaction” “OUT Transaction” IN OUT HOST

9 9 Endpoint Explained An endpoint is a buffer used to transmit or receive data Each endpoint has a direction and an address Up to 32 (16 pairs) endpoints can reside within a device Although a host has buffers, it does not have endpoints

10 10 Introduction to USB Plugging the USB cable Communication flow Lets talk about USB applications

11 11 USB Applications Control Transfer (Bus Enumeration) Interrupt Transfer Bulk Transfer Isochronous Transfer

12 12 Interrupt Transfer (1) Device never interrupts the host. Host polls the device Only way low speed devices can transfer data Also used by the host to send data to the device on a scheduled basis Maximum packet size: 1-64

13 13 Interrupt Transfer (2) DATA STAGE

14 14 Bulk Transfer (1) Used for large amount of data Only full and high-speed devices Host controller ensures that bulk transfer are eventually completed but it does not guarantee bandwidth Fastest transfer type on an otherwise idle bus Maximum packet size: 8,16,32,64,512

15 15 Bulk Transfer (2) DATA STAGE

16 16 Isochronous Transfer (1) Fixed number of bytes per frame. Bandwidth is guaranteed No error correction – No ACK field Used for continuous communication of time-relevant information (streaming data) Full and high-speed devices only Maximum Packet size: 1-1023

17 17 Isochronous Transfer (2) DATA STAGE No ACK field

18 18 Control Transfer (1) Enables the host to read information about the device (enumeration) All devices must support Control Transfers at Endpoint 0 Control transfers require both an IN and OUT Endpoint Talks to the device through Address 0 while enumeration Maximum Packet Size: 8,16,32,64

19 19 Control Transfer (2) SETUP STAGE DATA STAGE STATUS STAGE

20 20 USB Communication Blocks (1) Transfer Transfer Types Control Interrupt Bulk Isochronous Handshake PacketData PacketToken Packet Transaction Types OUT IN SOF (Start of Frame) SETUP Transaction

21 21 USB Communication Blocks (2)

22 22 LPC23xx

23 23 LPC2300 Family

24 24 LPC2378 (1)

25 25 LPC2378 (2)

26 26 Dual AHB Concurrent operations become possible: – Ethernet packet reception and transfer to SRAM – CPU Instruction Fetch – USB packet reception and transfer to SRAM – GP DMA Dedicating AHB Bus to Ethernet is required to guarantee 100 Mbits/sec Ethernet throughput without contention with other peripherals

27 27 USB 2.0 Fully Compliant with USB 2.0 Spec Supports Control, Bulk, Interrupt and Isochronous endpoints Scalable realization of Endpoints at Run time Double buffering supported for Bulk and Isochronous Endpoints Supports DMA transfer on all non-control endpoints

28 28 Available USB Device Stacks for LPC2300/2400/214x (list does not claim to be complete…) Keil RL-USB: –http://www.keil.com/arm/rl-arm/rl-usb.asphttp://www.keil.com/arm/rl-arm/rl-usb.asp Micrium µC/USB Device –http://www.micrium.com/products/usb/usb-device/overview.htmlhttp://www.micrium.com/products/usb/usb-device/overview.html Micro Digital smxUSBD –http://www.smxrtos.com/rtos/usb/smxusbd.htmhttp://www.smxrtos.com/rtos/usb/smxusbd.htm HCC Embedded USB (EUSB) Device Stack –http://www.hcc-embedded.com/site.php?mid=120http://www.hcc-embedded.com/site.php?mid=120 CMX-USB –http://www.cmx.com/cmx_usb.pdfhttp://www.cmx.com/cmx_usb.pdf Express Logic USBX –http://www.rtos.com/page/product.php?id=6http://www.rtos.com/page/product.php?id=6

29 29 Available USB Host Stacks for LPC2400/ LPC3180 (list does not claim to be complete…) Micrium µC/USB Host –http://www.micrium.com/products/usb/usb-host/usb-host.htmlhttp://www.micrium.com/products/usb/usb-host/usb-host.html Micro Digital smxUSBH –http://www.smxrtos.com/rtos/usb/smxusbh.htmhttp://www.smxrtos.com/rtos/usb/smxusbh.htm HCC Embedded USB (EUSB) HostLite Stack –http://www.hcc-embedded.com/site.php?mid=180http://www.hcc-embedded.com/site.php?mid=180 Express Logic USBX –http://www.rtos.com/http://www.rtos.com/ OnChip Technology –http://www.onchiptech.com/wb/pages/products/otusb.phphttp://www.onchiptech.com/wb/pages/products/otusb.php

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