STR720-EVAL Evaluation Board for STR72xF STR720-EVAL board Host to JTAG interface High speed JTAG debug port connection Main components Description ■ STR720 processor running at 66 MHz ■ EMI flash 4 Mbytes (2M x 16) ■ SMI SDRAM 16 Mbytes (2 x (4M x 16)) ■ SPI serial flash ■ LCD display The STR720-EVAL board is a complete development platform for the STR720 series. It is a cost effective, flexible and open design to demonstrate the capability of the STR720 series of microcontrollers and enable rapid evaluation of the STR720 devices and peripherals. It uses the high performance STR720 ARM720TTM device that embeds 8 Kbytes unified cache, has a memory management unit (MMU), 16K program RAM and numerous peripheral interfaces, including USB and CAN. Features ■ Support for the following interfaces: – ATAPI – USB – CAN – RS232 ■ LED displays ■ Test buttons ■ JTAG connector October 2005 The STR720-EVAL board includes shared memory interface (SMI) SDRAM and flash memory on the external memory interface (EMI) to enable freedom in development of large programs before custom hardware is designed. It integrates a 2 x 16 LCD, LEDs, UART, CAN, USB interfaces and test buttons to create a versatile stand-alone test platform. A wide choice of third party development tools are available in addition to those available from STMicroelectronics. Rev 2 1/31 www.st.com 1 STR720-EVAL 1 2 3 4 1/31 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.1 Processor and memory devices on this board . . . . . . . . . . . . . . . . . . . . . . . . 3 1.2 Board interface connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 1.3 Push buttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 1.4 Displays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.2 Processor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.3 Debug . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.4 Prototype area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.5 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.6 Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.7 Power supplies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.8 USB full speed interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.9 CAN interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.10 RS232 serial interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.11 Analog input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.12 LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.13 Push buttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 2.14 Option jumper placement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 2.15 Option switch settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 3.1 USB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 3.2 CAN bus connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 3.3 RS232 serial data connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 3.4 Debug . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 3.5 ATAPI interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 3.6 ADC input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 4.1 STR720-EVAL board top sheet 1 of 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 4.2 STR720-EVAL board top sheet 2 of 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 STR720-EVAL 5 4.3 STR720-Eval board - SMI SDRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 4.4 STR720-Eval board - EMI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 4.5 STR720-Eval board - EMI ATAPI interface 4.6 STR720-Eval board - EMI flash . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 4.7 STR720-Eval board - EMI LCD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 4.8 STR720-Eval board - ARM JTAG interface . . . . . . . . . . . . . . . . . . . . . . . . . 25 4.9 STR720-Eval board - USB interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 4.10 STR720-Eval board - CAN interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 4.11 STR720-Eval board - serial flash interfaces . . . . . . . . . . . . . . . . . . . . . . . . . 28 4.12 STR720-Eval board - RS232 interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 . . . . . . . . . . . . . . . . . . . . . . . . . 22 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 2/31 STR720-EVAL 1 Introduction 1 Introduction STMicroelectronics is a global independent semiconductor company that designs, develops, manufactures and markets a broad range of semiconductor integrated circuits and discrete devices used in a wide variety of applications. The STR720-EVAL board is based on the STR720, a highly integrated microcontroller, running at 66 MHz. It combines the popular ARM720TTM 32-bit RISC CPU that embeds 8 Kbytes of unified cache and a memory management unit (MMU) with16 Kbytes of program RAM, external SDRAM interface for up to 128 Mbytes of SDRAM, an EMI for up to 8 Mbytes of SRAM, flash or ROM and numerous on-chip peripherals. This board is intended as a low cost development platform to demonstrate the capability of the STR720 series of micro-controllers and to enable rapid evaluation of the STR720 devices and available peripherals. The STR720-EVAL board has 4 Mbytes of flash on EMI, 1-Mbit SPI serial flash and 16 Mbytes of SDRAM. It supports ATAPI, USB, CAN and RS232 interfaces. The on-board chip STR720RBQ6 is an ARM720TTM 32-bit RISC micro-controller with cache and MMU. This board includes a 2x16 programmable LCD display supported by reset, RTC reset, next, select and previous push buttons. The hardware platform of the STR720 series is supported by an extensive software support package, including device drivers in ANSI C source form and demonstration software. It is flashed with a demonstration application that shows the basic features of the device. Development tools are readily available. This is complemented by a range of third party realtime OS and middleware. Design schematics can also be supplied in electronic format to those customers with compatible design environments. Note: ARM® and ARM7TDMITM are registered trademarks of ARM Limited in the EU and other countries. 1.1 Processor and memory devices on this board ● ● ● 3/31 STR720 ARM720TTM processor running at 66 MHz, IC9: – 208-pin PQFP version, – 8 Kbytes cache, – 16 Kbytes program RAM, – memory management unit (MMU), – dual voltage, 1.8 V for core supply and 3.3 V for inputs/outputs, – nested interrupt controller. External memory interface: – flash (bank 0) 4 Mbytes arranged as 2M x 16: IC17, – LCD (bank 0), see Section 1.4 on page 4: LCD1, – ATAPI interface: CN3 SMI (bank 0) 16 Mbytes SDRAM arranged as (2 x (4M x 16)): IC8, IC15, STR720-EVAL ● ● 1.2 1 Introduction Clocking: – +3.3 V surface mounted 16 MHz oscillator provides the main clock source, – RTC real-time clock with embedded 32 KHz oscillator. Serial ROM. A 1-Mbit SPI serial flash connected to the buffered serial peripheral interface (BSPI): IC20. Board interface connections Diagrams and wiring descriptions for these connectors are provided in Section 4 on page 18. The following connections are supported by the board: ● USB support USB device using a type B connector: CN8, ● CAN uses a single 9 D-type connector with microswitch selectable low or high speed transceiver: CN7, ● UART1 (Rx and Tx only) connected to a 9-way male D-type RS232 connector: CN5, ● UART2 (Rx and Tx only) connected to a 9-way male D-type RS232 connector: CN6, ● JTAG, 20 pin IDC connector: CN2, ● variable resistor voltage range 0 to 2.5 V: VR1, ● LM35 temperature sensor: IC4, ● prototype area: GD1, ● test points various test points are located throughout the board, for details see Section 4.1 on page 18, main power supply: CN1. ● 1.3 Push buttons The following push buttons are provided, they are described further in Section 2.13 on page 10: 1.4 ● reset (RST), board reset: SW1, ● previous (PRV), programmable switch: SW8, ● next (NXT), programmable switch: SW9, ● select (SEL), programmable switch: SW10, ● RTC reset (RTCRST): SW11. Displays The following LCD and LEDs are provided: ● LCD write-only display, 2x16 LCD display connected to the EMI using a buffer and address decode logic, green back light display: LCD1, ● surface mount red +5 V and +3.3 V power indicators: LD1, LD2, ● surface mount yellow, IDE ATAPI +3.3 V power indicator: LD3, ● surface mount yellow, USB connection indicator: LD18, ● bi-color red/green, reset indicator: LD4, ● low consumption LEDs red: LD5, LD6, LD7, LD8, LD9, LD10, LD11, LD12, LD13, LD14, LD15, LD16, LD17. 4/31 STR720-EVAL 2 Hardware 2 Hardware Figure 1. STR720-EVAL board layout block diagram Prototype area GD1 DC power filter IC1 +5 V power CN1 3.3 V linear voltage regulator CN1 RS232-A UART 1 Rx and Tx only CN5 LD1 LD2 +3 V IC19 1.8 V linear voltage regulator IC3 SDRAM IC15 SDRAM IC8 RS232-B UART 2 Rx and Tx only CN6 Debug CN2 ADC input CN4 SPI serial flash IC20 STR720 ARM720TTM Variable resistor VR1 CAN CN7 LD4 LD 12 LD 13 LD 14 LD 15 LD 16 LD 17 LM35 IC4 16 MHz oscillator IC5 EMI flash IC17 LD 5 LD 6 LD 7 LD 8 LD 9 LD 10 LD 11 Low voltage invertor IC12 USB CN8 Low voltage CMOS IC18 LD18 ATAPI CN3 RST PRV NXT RTCRST SEL LD3 LCD display EMI 5/31 STR720-EVAL Figure 2. 2 Hardware STR720-EVAL board system block diagram Prototype area In-circuit emulator RS232 Rx and Tx LEDs CAN JTAG USB UART1 Flash RS232 Rx and Tx UART2 EMI/IDE ATAPI Variable resistor LCD Analog input Temperature sensor 5V power SMI SDRAM BSPI1 SPI serial flash 6/31 STR720-EVAL 2 Hardware 2.1 Overview The STR720-EVAL board is a general purpose evaluation platform with ATAPI, USB, CAN (controller area network) and RS232 interfaces. 2.2 Processor The board supports the STR720 ARM720TTM silicon - 208-pin PQFP version. This chip runs at a frequency of 66 MHz. Boot modes and configuration options are set using microswitches, see Section 2.15: Option switch settings on page 12 2.3 Debug Software debug is performed using a standard 20-pin JTAG connection. This may connect to a JTAG in-circuit emulator. 2.4 Prototype area A 2.54x2.54mm gridded area of 1mm holes is available for prototyping using wire wrap or similar prototyping techniques. 2.5 Reset The reset sources are: 2.6 ● power on reset, ● push button reset, ● JTAG reset from an in-circuit emulator. Memory Table 1. STR720-EVAL board SDRAM memory map Region - Usage SDRAM Table 2. 0xA000 0000 - 0xA0FF FFFF STR720-EVAL board EMI memory map Region 7/31 Memory map used Usage Memory map used 3 EMI 0x4000 0000 - 0x5FFF FFFF 2 flash 0x4000 0000 - 0x403F FFFF 1 LCD 0x4040 0000 - 0x407F FFFF STR720-EVAL 2.7 2 Hardware Power supplies Power to the board is supplied using a lump in cord power supply providing 5 V to the board. All other required voltages are provided on-board by voltage regulators or voltage convertors. 2.8 USB full speed interface USB full speed interface device supported by a type B connector. The USB clock uses a separate 48 MHz oscillator. See Section 3.1: USB on page 14. 2.9 CAN interface A general purpose, asynchronous serial I/O data port connected through a 9-pin D-type male connector with microswitch selectable low speed fault tolerant transceiver (L9669) or low or high speed selectable transceiver (L9616). See Section 3.2: CAN bus connector on page 14. The L9669 transceiver only works in normal mode, the wake-up functionality is not implemented. Caution: The board schematic for the CAN interface detailed in Section 4.10: STR720-Eval board - CAN interface, is not a reference design and should not be copied. To design a CAN interface with the STR720 please refer to the “STR720 Hardware Development Getting Started Guide AN1907”. 2.10 RS232 serial interfaces Two general purpose, asynchronous serial I/O data ports are connected through 9-pin D-type male connectors. Refer to Section 3.3: RS232 serial data connector on page 15. RS232-A connects directly to UART1, transmit and receive only. RS232-B connects to UART2, transmit and receive only. RTS is shorted to CTS and DTR is shorted to DSR at the connector for both interfaces. 2.11 Analog input The following analog inputs are provided, see the schematics Section 4.1 on page 18: ● ADC connector: CN4, ● LM35 temperature sensor IC4 is connected to pin 4 of the ADC connector CN4 (pins 3 and 4 must be shorted to enable temperature sensing,) ● variable resistor VR1 is connected to pin 2 of the ADC connector CN4 (pins 1 and 2 must be shorted to enable the variable resistor.) 8/31 STR720-EVAL 2 Hardware If pins 5 and 7 are not used they should be shorted to pins 6 and 8 respectively. Alternatively the analog inputs can be used directly by removing the shorting and connecting the signal to be sampled to links 1, 3, 5 or 7, see Figure 3. Figure 3. ADC connector CN4: applying shorting STR720 ANA0 ANA1 ANA2 ANA3 2.12 CN4 1 2 Variable resistor 3 4 5 6 Temperature sensor LM35 7 8 LEDs Software controlled LEDs The (red) LEDs in Table 3 are software controlled by PIO pins. See the schematic in Section 4.1 on page 18. Table 3. Software controlled LEDs LED 9/31 Signal name LD5 LED_P3_7 LD6 LED_P3_11 LD7 LED_P3_12 LD8 LED_P4_1 LD9 LED_P4_2 LD10 LED_P4_3 LD11 LED_P4_4 LD12 LED_P3_0 LD13 LED_P3_1 LD14 LED_P3_2 LD15 LED_P3_3 LD16 LED_P3_4 LD17 LED_P3_5 STR720-EVAL 2 Hardware Status LEDs Table 4. Status LEDs LED 2.13 Description Color LD1 +5 V Section 4.2 on page 19 Red LD2 +3.3 V Section 4.2 on page 19 Red LD3 ATAPI HDD Section 4.5 on page 22 Yellow LD4 reset indicator Section 4.1 on page 18 Red/green LD18 USB indicator Section 4.9 on page 26 Yellow Push buttons Table 5. Status push buttons Button 2.14 Schematic Connected to Schematic Board reset SW1 power on reset Section 4.8 on page 25 Previous SW8 P3.10_EINT2 Section 4.1 on page 18 Next SW9 P3.8_EINT0 Section 4.1 on page 18 Select SW10 P3.9_EINT1 Section 4.1 on page 18 RTC reset SW11 not RTC_reset Section 4.1 on page 18 Option jumper placement Jumpers are fitted as shown in Figure 4, the position of the jumbers on the board are shown in Figure 5 on page 11. Figure 4. Jumper positions Not fitted Table 6. Jumper Do not fit Fitted Option jumpers Figure Description Default Fitted J1 Section 4.8 on page 25 notRST to notJTRST connect: fitted = enabled, not fitted = disabled J2 Section 4.10 on page 27 CAN loopback link: not fitted / fitted (default) Not fitted 10/31 STR720-EVAL 2 Hardware Figure 5. Option jumpersm resistors and switches Prototype area SW3 SW4 J1 STR720 ARM720TTM SW5 SW6 J2 SW7 SW2 PRV NXT RTCRST SEL SW8 SW9 SW11 SW10 Push buttons 11/31 RST SW1 Push button STR720-EVAL 2.15 2 Hardware Option switch settings For switch position details, see Figure 6. Figure 6. Switch positions 1-2 2-3 Microswitches Table 7. 1 A 1 1 A A Slide switches Option switch settings Switch Schematic SW1 Section 4.1 on page 18 Reset Section 4.1 on page 18 Boot mode: 1-2 = Boot from internal ROM 2-3 = Boot from external flash See Figure 7 and Figure 8 on page 13. 2-3 SPI flash notW: 1-2 = Active 2-3 = Inactive 2-3 SPI flash notHOLD: 1-2 = Active 2-3 = Inactive 2-3 SW2 Section 4.11 on page 28 SW3 Section 4.11 on page 28 SW4 SW5 Section 4.10 on page 27 SW6 Section 4.10 on page 27 SW7 Description CAN transceiver select: L9669 / L9616 (default) Note SW5 and SW6 must be changed together. 1 = L9669 A = L9616 L9616 ASC speed: 1-2 = pull down = high speed 2-3 = pull up = low speed Default Push to make 1 1 2-3 SW8 Section 4.1 on page 18 Previous Push to make SW9 Section 4.1 on page 18 Next Push to make SW10 Section 4.1 on page 18 Select Push to make SW11 Section 4.1 on page 18 RTC reset Push to make 12/31 STR720-EVAL 2 Hardware Figure 7. SW2 boot from internal ROM SW2 = 1-2 Boot from internal ROM STR720 SW2 EXT_BOOT Figure 8. SW2 boot from external flash SW2 = 2-3 Boot from external flash STR720 SW2 EXT_BOOT 13/31 STR720-EVAL 3 Connectors 3 Connectors 3.1 USB Figure 9. USB-B connector: CN3 USB-B Table 8. 3.2 USB-B connector pinout: CN3 Pin Description 1 VBUS 2 DM 3 DP 4 GND CAN bus connector Figure 10. CAN connector 9 pin male D-type: CN4 CAN - data 2 3 4 1 6 Table 9. 7 8 5 9 CAN connector pinout: CN4 Pin Description Pin Description Pin Description 1 Not connected 4 Not connected 7 CAN H, high side bus output 2 CAN L, low side bus output 5 Not connected 8 Pull down to GROUND 3 Ground GROUND 9 Pull up to +3V3 6 14/31 STR720-EVAL 3 Connectors 3.3 RS232 serial data connector 9-pin general purpose D-type male connectors Figure 11. RS232 transmit and receive connectors: CN7, CN8 RS232 - Data A 1 2 6 Table 10. 3.4 3 7 4 8 1 5 RS232 - Data B 2 3 4 5 9 6 7 8 9 RS232 connector pinout: CN7, CN8 Pin Description Pin Description Pin Description 1 Shorted to pin 4 and 6 4 Shorted to pin 1 and 6 7 Shorted to pin 8 2 R1IN (port A), R2IN (port B) 5 GROUND 8 Shorted to pin 7 3 T1OUT (port A), T2OUT (port B) 6 Shorted to pin 1 and 4 9 Not connected Debug Figure 12. JTAG standard interface: CN9 Debug-JTAG port 19 20 Table 11. 15/31 17 18 15 16 13 14 11 12 9 7 5 3 1 10 8 6 4 2 JTAG interface pinout: CN9 Pin Description Pin Description 4, 6, 8, 10, 12, 14, 16, 18, 20 GROUND 9 TCK 1 VTref+3.3 V 11 RTCK (GROUND) 2 Vsupply +3.3 V 13 TD0 3 notTRST 15 notReset 5 TDI 17 DBGRQS pulled low 7 TMS 19 DBGACK pulled low STR720-EVAL 3.5 3 Connectors ATAPI interface Figure 13. ATAPI interface: CN3 39 37 35 33 31 29 27 25 23 21 19 17 15 13 11 9 7 5 3 1 40 38 36 34 32 30 28 26 24 22 20 18 16 14 12 10 8 6 4 2 Viewed from above board Table 12: ATAPI interface connector: CN3 Pin Assignment Pin Assignment 1 notRESET 2 ground 3 ddata7 4 ddata8 5 ddata6 6 ddata9 7 ddata5 8 ddata10 9 ddata4 10 ddata11 11 ddata3 12 ddata12 13 ddata2 14 ddata13 15 ddata1 16 ddata14 17 ddata0 18 ddata15 19 ground 20 reserved 21 dmarq 22 ground 23 notDIOW 24 ground 25 not_DIOR 26 ground 27 iordy 28 spsync_csel 29 not_DMACK 30 ground 31 intrq 32 not_IOCS16 33 DA1 34 pdiag 35 DA0 36 DA2 37 notCS0 38 notCS1 39 notDASP 40 ground 16/31 STR720-EVAL 3 Connectors 3.6 ADC input Figure 14. ADC input connector: CN4 ADC input Table 13. 17/31 7 5 3 1 8 6 4 2 ADC interface pinout: CN4 Pin Description Pin Description 1 ANA0 5 ANA2 2 Variable resistor output 6 GROUND 3 ANA1 7 ANA3 4 Temperature sensor output 8 GROUND STR720-EVAL 4 Schematics 4.1 STR720-EVAL board top sheet 1 of 2 4 Schematics 18/31 4 Schematics 4.2 19/31 STR720-EVAL board top sheet 2 of 2 STR720-EVAL STR720-EVAL 4.3 4 Schematics STR720-Eval board - SMI SDRAM 20/31 4 Schematics 4.4 21/31 STR720-Eval board - EMI STR720-EVAL STR720-EVAL 4.5 4 Schematics STR720-Eval board - EMI ATAPI interface 22/31 4 Schematics 4.6 23/31 STR720-Eval board - EMI flash STR720-EVAL STR720-EVAL 4.7 4 Schematics STR720-Eval board - EMI LCD 24/31 4 Schematics 4.8 25/31 STR720-Eval board - ARM JTAG interface STR720-EVAL STR720-EVAL 4.9 4 Schematics STR720-Eval board - USB interface 26/31 Caution: the CAN interface is not to be used in industrial applications, see the “STR720 Hardware Development Getting Started Guide AN1907. 4 Schematics 4.10 27/31 STR720-EVAL STR720-Eval board - CAN interface STR720-EVAL 4.11 4 Schematics STR720-Eval board - serial flash interfaces 28/31 4 Schematics 4.12 29/31 STR720-Eval board - RS232 interface STR720-EVAL STR720-EVAL 5 5 Revision history Revision history Date Revision Changes 26-September-2005 1 Initial external release. 4-October-2005 2 Page 1 - Updated image. Figure 2: STR720-EVAL board system block diagram on page 6 correction. Section 2.3: Debug on page 7 - correction. Section 2.8: USB full speed interface on page 8 - correction to SDRAM and LCD. Section 2.8: USB full speed interface on page 8 - rephrased. Section 2.9: CAN interface on page 8 - expanded and added caution. Section 2.15: Option switch settings on page 12 - correction to SW2. Section 3.4: Debug on page 15 - clarification for even pins. Chapter 4: Schematics updated revision and Section 4.9: STR720Eval board - USB interface on page 26 and Section 4.10: STR720Eval board - CAN interface on page 27 detail design changes. Section 4.1: STR720-EVAL board top sheet 1 of 2 on page 18 is updated with ClkVref pin19 connected to +1.8 V including decoupling cap. Removed list of third party vendors from the description. 30/31 Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics. 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