GPS GPS-1000X Series, Руководство пользователя

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82 User Manual
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Data Length — The oscilloscope triggers when the SDA data length is equal to
the value set in the Byte Length softkey.
4. If you have set the oscilloscope to trigger on an EEPROM Data Read condition:
Press the Limit Range softkey to set the oscilloscope to trigger when data is = (equal
to), < (less than), or > (greater than) the data value set in the Data1 softkey.
The oscilloscope will trigger on the clock edge for the Ack bit after the trigger event is
found. This data byte does not need to occur directly after the control byte. The
oscilloscope will trigger on any data byte that meets the criteria defined by the Byte
Length and Data1 softkeys during a current address read or a random read or a
sequential read cycle.
5. If you have set the oscilloscope to trigger on a 7- bit address read or write frame
condition or a 10- bit read or write frame condition:
a. Press the Addr softkey and turn the Universal Knob to select the 7- bit or 10- bit
device address.
You can select from an address range of 0x00 to 0x7F (7- bit) or 0x3FF (10-bit)
hexadecimal. When triggering on a read/write frame, the oscilloscope will trigger
after the start, address, read/write, acknowledge, and data events occur. If don't
care is selected (0xXX or 0xXXX) for the address, the address will be ignored.
The trigger will always occur on the 17th clock for 7- bit addressing or 26th clock
for 10- bit addressing.
b. Press the Data1 or Data2 softkey and turn the Universal Knob to select the 8- bit
data pattern on which to trigger. You can select a data value in the range of 0x00
to 0xFF (hexadecimal). The oscilloscope will trigger after the start, address,
read/write, acknowledge, and data events occur.
c. If don't care (0xXX) is selected for data, the data will be ignored. The trigger will
always occur on the 17th clock for 7- bit addressing or 26th clock for 10- bit
addressing. If you have selected a three- byte trigger, press the Data2 value
softkey and turn the Universal Knob to select the 8- bit data pattern on which to
trigger.
6. If you have set the oscilloscope to trigger on data length condition:
a. Press Address to set the SDA address length 7bit or 10 bit.
b. Press Byte Length softkey and turn the Universal Knob to select the byte
length.
c. The range of the Byte Length is 1 to 12.
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