EVB-USB2524

EVB-USB2524 Evaluation Board Revision B1 Copyright © 2006 SMSC or its subsidiaries. All rights reserved. The information contained herein is confidential and proprietary to SMSC, shall be used solely in accordance with the agreement pursuant to which it is provided, and shall not be reproduced or disclosed to others without the prior written consent of SMSC. Although the information is believed to be accurate, no responsibility is assumed for inaccuracies. SMSC reserves the right to make changes to this document and to specifications and product descriptions at any time without notice. Neither the provision of this information nor the sale of the described semiconductor devices conveys any licenses under any patent rights or other intellectual property rights of SMSC or others. The product may contain design defects or errors known as anomalies, including but not necessarily limited to any which may be identified in this document, which may cause the product to deviate from published specifications. SMSC products are not designed, intended, authorized or warranted for use in any life support or other application where product failure could cause or contribute to personal injury or severe property damage. Any and all such uses without prior written approval of an officer of SMSC will be fully at the risk of the customer. SMSC is a registered trademark of Standard Microsystems Corporation (“SMSC”). SMSC DISCLAIMS AND EXCLUDES ANY AND ALL WARRANTIES, INCLUDING WITHOUT LIMITATION ANY AND ALL IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, TITLE, AND AGAINST INFRINGEMENT AND THE LIKE, AND ANY AND ALL WARRANTIES ARISING FROM ANY COURSE OF DEALING OR USAGE OF TRADE. IN NO EVENT SHALL SMSC BE LIABLE FOR ANY DIRECT, INCIDENTAL, INDIRECT, SPECIAL, PUNITIVE, OR CONSEQUENTIAL DAMAGES; OR FOR LOST DATA, PROFITS, SAVINGS OR REVENUES OF ANY KIND; REGARDLESS OF THE FORM OF ACTION, WHETHER BASED ON CONTRACT; TORT; NEGLIGENCE OF SMSC OR OTHERS; STRICT LIABILITY; BREACH OF WARRANTY; OR OTHERWISE; WHETHER OR NOT ANY REMEDY OF BUYER IS HELD TO HAVE FAILED OF ITS ESSENTIAL PURPOSE, AND WHETHER OR NOT SMSC HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SMSC EVB-USB2524 Revision 0.9 (09-28-06) EVB-USB2524 Evaluation Board Revision B1 1 Overview The SMSC USB2524 MultiSwitchTM is an USB2.0 compliant switching hub with two up-stream ports and four down-stream ports. The EVB-USB2524 Evaluation Board demonstrates a stand alone application for the switching hub with all the features listed below. Each of the down stream ports can individually be assigned to up-stream port 1 or up-stream port 2. The port assignment can be dynamically changed with user accessible switches individually for each port. 1.1 1.2 Features „ Operates from a single voltage (+5.0V, regulated) 'wall wart' external power supply „ Low Cost 2-Layer Design „ Self-powered operation „ Multi-TT enabled „ Supports four program selection options: Internal defaults, EEPROM (default), SMBus, Strapping options „ Serial EEPROM for configuration in a socket for easy programming „ Single Onboard +3.3V Regulator „ LED status modes supported: USB, BASIC, and DUAL LED „ Single Crystal Clock Source „ Individual port over-current sensing „ Individual port power control „ High-speed, Full-speed, and Low-speed capable „ Port Assignment interface „ Port OCS/Port Power Control interface „ Optional ESD and EMI footprints are provided General Description The EVB-USB2524 is a demonstration and evaluation platform featuring the USB2524 MultiSwitchTM 4-port USB2.0 Switching Hub. It is designed to robustly demonstrate this unique device's features using a low-cost PCB implementation. The EVB-USB2524 features an on-board EEPROM for VID/PID/DID and configuration strings, such as switching options, LED status options, and non-removable or disabled configuration for each port. The manufacturer, product and serial strings for the hub can be changed in the EEPROM as well. The EVB-USB2524 can also be configured through changing population of resistors to access internal “strapping options”, without using the EEPROM. The schematic for the EVB-USB2524 indicates which components are required for each configuration option. Revision 0.9 (09-28-06) SECURITY LEVEL 2 SMSC EVB-USB2524 EVB-USB2524 Evaluation Board Revision B1 2 Getting Started 2.1 Port Assignment The EVB-USB2524 port assignments are selected by four level switches SW1 to SW4 located in the upper right-hand corner. When only one up-stream port, “US 1” or “US 2” is connected to an operational host, all down-stream ports will be assigned to that host. In this case the switches do not have any effect. When both up-stream ports are connected to operational hosts “US 2” is selected with switch in the bottom position and “US 1” with the switch in the top position. Figure 2.1 shows the switches in detail. Down-stream ports are numbered 1 through 4. The switches are labeled accordingly with the left-most switch controlling down-stream port 1 and the right-most switch close to the supply connector controlling down-stream port 4. Figure 2.1 SMSC EVB-USB2524 SECURITY LEVEL 3 Revision 0.9 (09-28-06) EVB-USB2524 Evaluation Board Revision B1 3 Hardware Configuration The EVB-USB2524 has two sets of resistor jumpers. The first set selects the USB2524 configuration; internal defaults, SMBus slave or EEPROM configuration. The second set enables dual LED mode. 3.1 USB2524 Configuration Selection The USB2524 has three configuration pins CFG_SEL[2:0], that determines the operating mode of the USB2524. The selection of a configuration is done with six resistor combinations shown in Table 3.1. Only three resistors are installed to either pull up or pull down each configuration pin. Figure 3.1 shows a section of the PCB for the EVBUSB2524 where the resistors are located. Table 3.1 Resistor selection for USB2524 configuration CFG_SEL2 R1 CFG_SEL1 R3 CFG_SEL0 R6 Configuration Internal Default Configuration „ 3-wire port configuration „ Strap options enabled „ USB LED mode R1 R3 R5 SMBus Slave Configuration R1 R4 R6 Internal Default Configuration R1 R4 R5 R2 R3 R3 R6 R5 „ Strap options enabled „ USB LED mode This is default if no jumpers are populated on J1 Internal Default Configuration „ 4-wire (edge) port configuration „ Strap options enabled „ Single mode LED Internal Default Configuration R2 R4 R6 Reserved R2 R4 R5 Reserved Revision 0.9 (09-28-06) 4-wire port configuration EERPOM Configuration Note: R2 „ „ 4-wire (edge) port configuration „ Dual mode LED SECURITY LEVEL 4 SMSC EVB-USB2524 EVB-USB2524 Evaluation Board Revision B1 Figure 3.1 Location of resistors for configuration of USB2524. 3.2 LED Configuration The USB2524 supports three different modes for LED indicators: USB, Basic and DUAL LED. The EVB-USB2524 is configured for Basic LED operation, which means that eight LEDs are used to signal port assignment. Each downstream port has one green and one red LED. When the port is assigned to up-stream port 1 the green LED is lit. When the port is assigned to up-stream port 2 the red LED is lit. 3.2.1 Resistors for Dual LED operation The USB2524 also supports Dual LED mode. This mode indicates up-stream port assignment and speed of device plugged into the down-stream port. To enable dual LED operation resistors R38 and R41 must be installed. Both resistors should be 0 ohms. The USB2524 must also be reconfigured either by changing the configuration pin selection (see table 3.1) or by changing the contents of the EEPROM. In the Dual LED configuration port speed is signalled along with port assignment. With two dual color (green/red) LEDs one each for upstream port 1 and upstream port 2 assignment. The interpretation of the color coding for the LEDs are defined in table 3.2. SMSC EVB-USB2524 SECURITY LEVEL 5 Revision 0.9 (09-28-06) EVB-USB2524 Evaluation Board Revision B1 Table 3.2 Dual LED Configuration color coding Green Red Port Status OFF OFF Un-assigned/OFF OFF ON Port is assigned and operating at LS/FS speed ON OFF Port is assigned and operating at High speed ON ON Port is assigned to unattached upstream port Note: Revision 0.9 (09-28-06) The USB2524 sends a continuos 1kHz pulse train in this state. SECURITY LEVEL 6 SMSC EVB-USB2524 EVB-USB2524 Evaluation Board Revision B1 4 Connector Description The EVB-USB2524 has a standard set of USB style connectors, two of type B for upstream ports and four of type A for downstream ports. Power is supplied via a 2.0 mm power jack. There are three pin strip header blocks for external hardware to access the USB2524. Table 4.1 lists all the connectors. For more details on the pinout of the connectors please see the schematic. The locations of connectors and components are shown in figure 4.1. Table 4.1 Connector Type J3 USB B Upstream Port 1 J4 USB B Upstream Port 2 J18 USB A Downstream Port 1 J19 USB A Downstream Port 2 J20 USB A Downstream Port 3 J21 USB A Downstream Port 4 J2 Power Jack 2.0mm +5V Power Supply J5 Pin Strip 1 x 2 +5V Power Supply J6 Pin Strip 2 x 5 SMBus/Configuration Control SMSC EVB-USB2524 SECURITY LEVEL 7 Revision 0.9 (09-28-06) EVB-USB2524 Evaluation Board Revision B1 Figure 4.1 EVB-USB2524 PCB layout Revision 0.9 (09-28-06) SECURITY LEVEL 8 SMSC EVB-USB2524