AT AT-LA500, Руководство пользователя

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AT-LA500 – U
SER MANUAL
R
ELEASE
3.4 – JUNE 2009 36
SPI/µWire Trigger
In this mode, the AT-LA500 can trigger when a selected event occurs on a SPI (Serial Peripheral
Interface) or µWire bus. The AT-LA500 can trigger on SPI operations addressing up to 8 different
peripherals by monitoring the related SSn (Slave Select) signals. Furthermore, the acquired data are
decoded and shown in the Waveform View and State Listing windows.
The
Protocol control allows to select between SPI and µWire protocol. When the µWire protocol is
selected, some controls are disabled. The following description refers to the more general SPI
protocol trigger settings options.
To set up the AT-LA500 for a SPI acquisition, the following steps are required:
•
Connect a probe to the pod A of the AT-LA500;
•
Connect at least one grounded pin (white wires) to the ground of the board to test;
•
Connect the Channel 0 (black wire) to the SCLK line of the SPI bus to test.
•
Connect the
Channel 1
(brown wire) to the
MOSI
line of the SPI bus to test;
•
Connect the Channel 2 (red wire) to the MISO line of the SPI bus to test.
•
Optionally, connect Channels 3 to 10 to the SSn lines of the SPI peripherals of the board
under test;