Locating Signals
Noisy Sine
Board label. NOISY_SINE
Connector g rid location. B7
Description. The Noisy Sine signal is an audio frequency (1.25 kHz) sine wave with power supply s witching noise style spikes
(156 kHz), and very high frequency noise (20 MHz ps eudorandom) cause d by a micro-controller/DSP system.
I
2
CBus
Board label. I2C_CLK, I2C_DATA
Connector grid location. A2, G1
Description. These are the I
2
C (Inter-IC Communication) bus signals betwee n the μC and a serial EEPROM.
There are several different types of data packets.
The clock rate is a 100 kHz, 0 to 5 volt signal.
SPI Bus
Board label. SPI_SCLK, SPI_SS, SPI_MOSI
Connector grid location. F1,G1,G2,H1
Description. These are the SPI (Serial Peripheral Interface) serial bus signals. (See Figure 2.)
114 Demo 2 Board Instruction Manual
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