Sdram; Serial Port; Video Encoder And Filter; Audio Outputs - BrightSign HD120 Hardware Manual

BrightSign HD120, HD220, HD1020

SDRAM

The HD120, HD220, and HD1020 players each contain one DDR SDRAM device. When the BCM7208 boots, it will copy
the code from the NAND flash device into the SDRAM and then execute the code from the SDRAM. The SDRAM runs at
a clock rate of 666MHz, with a data rate of 1333MHz.

Serial Port

The player has a built in UART that communicates with the RS-232 level shifter. The MAX232 creates valid RS-232
voltage levels for the transmit pin by using a capacitive voltage switcher.

Video Encoder and Filter

The BCM7208 streams decoded video using a single-data race clock. It also streams the same video out of the on-board
DACs.

Audio Outputs

The HD120, HD220, and HD1020 players each have a single Texas Instruments high quality audio DAC device, which
takes in digital audio signals from the BCM7208 in an I2S audio format. The AUD_LRCIN is the framing signal for the
audio and runs at the frame rate of the audio source (usually either 44.1KHz or 48KHz). The AUD_BITCLK signal is
typically 64 times higher than the AUD_LRCIN.
The audio output from the TI amplifier is sent directly to the audio output jack. It can drive a 32 Ohm load with a 2 V RMS
signal.

On-Board LEDs

There are four on-board LEDs that indicate the following:
LED Indication
Green power Flashes any time the board is powered up and not in reset mode.
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All information provided in this reference manual applies to products under development. The characteristics and specifications of these products are subject to
change without notice. BrightSign assumes no obligation regarding future manufacturing unless otherwise agreed to in writing. © BrightSign LLC, 2012