Belkin XM Commander Especificações descarregar pdf (Página 109)

REF: BB_SRM_xM BeagleBoard-xM System

Reference Manual

Revision A2

Page 109 of 164

GPIO_168 GP Input/Output pin. Can be used as an interrupt pin. I/O 24

GPIO_183 GP Input/Output pin. Can be used as an interrupt pin. I/O 23

McSPI Port 3

McSPI3_CS0 Multi channel SPI chip select 0 O 11

McSPI3_CS1 Multi channel SPI chip select 1 O 13

McSPI3_SIMO Multi channel SPI slave in master out I/O 19

McSPI3_SOMI Multi channel SPI slave out master in I/O 17

McSPI3_CLK Multi channel SPI clock I/O 21

McSPI Port 4

McSPI4_SIMO Multi channel SPI slave in master out I/O 12

McSPI4_SOMI Multi channel SPI slave out master in I/) 18

McSPI4_CS0 Multi channel SPI chip select 0 O 16

McSPI4_CLK Multi channel SPI clock I/O 20

UART Port 2

UART2_CTS UART clear to send. I/O 4

UART2_RTS UART request to send O 10

UART2_RX UART receive I 8

UART2_TX UART transmit O 6

GPT PWM

GPT9_PWMEVT PWM or event for GP timer 9 O 4

GPT11_PWMEVT PWM or event for GP timer 11 O 10

GPT10_PWMEVT PWM or event for GP timer 10 O 8

8.24.3 Power

The expansion connector provides two power rails. The first is the VIO_1.8V rail which

is supplied by the TPS65950. This rail is limited in the current it can supply from the

TPS65950 and what remains from the current consumed by the BeagleBoard and is

intended to be used to provide a rail for voltage level conversion only. It is not intended

to power a lot of circuitry on the expansion board. All signals from the BeagleBoard are

at 1.8V.

The other rail is the DC_5V. The same restriction exits on this rail as mentioned in the

USB section. The amount of available power to an expansion board depends on the

available power from the DC supply or the USB supply from the PC.

8.24.4 Reset

The nRESET signal is the main board reset signal. When the board powers up, this

signal will act as an input to reset circuitry on the expansion board. After power up, a

system reset can be generated by the expansion board by taking this signal low. This

signal is a 1.8V level signal.

8.24.5 Power Control

There is an additional open-drain signal on the connector called REGEN. The purpose of

this signal is to provide a means to control power circuitry on the expansion card to turn

on and off the voltages. This insures that the power on the expansion board is turned on at

the appropriate time. Depending on what circuitry is provided on the expansion board, an

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