Cypress CY62158EV30 Manual do Utilizador descarregar pdf (Página 16)

16 September 5, 2010

more than 1 Amp, or if the switches’ thermal limits are exceeded by a device drawing more than

500 mA. USB0PFLT indicates the over-current status back to the microcontroller.

The development board can be either a bus-powered USB device or self-powered USB device

depending on the power-supply configuration jumpers.

When using the development board in USB-host mode, power to the EVB should be supplied by

the In-circuit Debugger (ICDI) USB cable or by a +5 V source connected to the DC power jack.

Note that the LM3S9B96’s USB capabilities are completely independent from the In-Circuit Debug

Interface USB functionality.

Debugging

Stellaris microcontrollers support programming and debugging using either JTAG or SWD. JTAG

uses the TCK, TMS, TDI, and TDO signals. SWD requires fewer signals (SWCLK, SWDIO, and,

optionally, SWO for trace). The debugger determines which debug protocol is used.

Debugging Modes

The LM3S9B96 development board supports a range of hardware debugging configurations.

Table 2-3 summarizes these configurations.

Debug In Considerations

Debug Mode 3 supports board debugging using an external debug interface such as a Segger

J-Link or Keil ULINK. Most debuggers use Pin 1 of the Debug connector to sense the target

voltage and, in some cases, power the output logic circuit. Installing the VDD/PIN1 jumper will

apply 3.3 V power to this pin in order to support external debuggers.

Debug USB Overview

An FT2232 device from Future Technology Devices International Ltd implements USB-to-serial

conversion. The FT2232 is factory-configured to implement a JTAG/SWD port (synchronous

serial) on channel A and a Virtual COM Port (VCP) on channel B. This feature allows two

simultaneous communications links between the host computer and the target device using a

single USB cable. Separate Windows drivers for each function are provided on the Documentation

and Software CD.

The In-Circuit Debug Interface USB capabilities are completely independent from the LM3S9B96’s

on-chip USB functionality.

Table 2-3. Hardware Debugging Configurations

Mode Debug Function Use Selected by...

1 Internal ICDI Debug on-board LM3S9B96

microcontroller over Debug

USB interface.

Default mode

2 ICDI out to JTAG/ SWD

header

The development board is

used as a USB to SWD/

JTAG interface to an

external target.

Remove jumpers on TCk,

TMS, TDI, TDO, and PIN1

3 In from JTAG/SWD header For users who prefer an

external debug interface

(ULINK, JLINK, etc.) with the

development board.

Connecting an external

debugger to the JTAG/SWD

header

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 80 81

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