Running Title—Attribute Reference
2.5 Jumpers and Switches
Table 2−2 is provided to help set up and configure the EVM platform jumpers to the desired mode of operation. The EVM can download firmware code from the PC through a loading program (which may or may not be supplied with your EVM) or from an I2C EEPROM. A 5-V power source may be supplied from an external source or from the USB cable. If supplied from an external source, U2 must be set to position 2−3. If supplied from the USB cable, set U2 to position 1−2. The 5-V source is used to generate 3.3 V using an LDO regulator. JP2 and JP3 are used to connect P3.0 and P3.1 to R1OUT and T1IN of the RS232 connector, respectively. JP4 must be set to off when not using the MCU’s UART.
Table 2−2. Jumpers and Switches
Jumper/Switch | Jumper/Switch Description |
| |
U2 | Position 1−2: 5-V bus power supply; position 2−3: 5-V dc or 5-V switching supply |
| |
JP2 | Position 1−2 on: connect P3.0 to R1OUT; position 1−2 off: disconnect P3.0 from R1OUT |
| |
JP3 | Position 1−2 on: connect P3.1 to T1IN; position 1−2 off: disconnect P3.1 from T1IN |
| |
JP4 | Position 1−2 on: supplies power to RS−232 transceiver; position 1−2 off: RS−232 |
| transceiver is not powered. See Note. |
| |
NOTE: JP4 supplies 5 V to the RS−232 transceiver for the REV 1.1 board. JP4 supplies 3.3 V to the RS−232 transceiver for the REV 1.2 board.
2.6 EEPROM
The I2C EEPROM provides application-specific firmware. The TUSB3210 automatically reads the EEPROM at power up via the I2C bus. A header must be added to the application firmware before loading into the EEPROM. See the TUSB2136/3210 Bootcode Document for USB to General_Purpose Device ccontroller user’s guide (SLLU025) for a description of the header definition. The header may be generated automatically using the I2C Header Generation Utility software provided with the device.
The EVM ships with a preprogrammed EEPROM that has either keyboard controller firmware or compact flash reader firmware. It enumerates properly when connected to a USB host.
2.7 GPIO Connector
The 50-pin GPIO connector provides access to the TUSB3210 GPIOs as well as some other control signals. Figure 2−1 shows the signals available on the connector.
Chapter Title—Attribute Reference | 2-3 |
