R&S
®
CMW 500 Basic Instrument Functions
Setup Dialog
Operating Manual 1202.3986.32 – 03 61
4.3.2.2 Board Tests
A board test verifies that a particular hardware module works properly. Depending on
the board, the R&S CMW 500 may provide different types of board tests:
Diagnoses test
The R&S CMW 500 measures a series of selectable diagnostic voltages and checks
whether they are within the permitted range. The permitted minimum and maximum
voltages are stored in the EEPROM of the tested board.
A diagnoses test is provided for most of the R&S CMW 500 modules.
Memory test
The R&S CMW 500 tests one or more of the memories (SRAM, ASRAM, DDR2) on
the board. Two different types of memory tests are provided.
For an Address Line Test, the individual address lines of the RAM are activated
one after another in order to transfer a definite number to the RAM. If the
instrument can read the transferred and stored numbers correctly after testing all
address lines, the address lines must be independent (not interconnected), as
required.
For a Pseudorandom (RRAN) Test, the R&S CMW 500 generates a pseudo-
random bit sequence (PRBS) which is first written to the RAM and then read. The
R&S CMW 500 checks whether the read PRBS is equal to the generated PRBS.
An address line test is generally faster than a PRAN test. Notice that a failed address
line test does not necessarily prove that two address lines are connected; the problem
may be due to one of the other components involved in data transmission and storage.
Download test
The R&S CMW 500 loads program data into a DSP or FGPGA module and verifies
that the module responds properly.
EEPROM test
The R&S CMW 500 verifies that the I2C EEPROM data of the board is well-formed (i.e.
the syntax is correct, the contents are logically compatible). If no access to the
EEPROM data is possible, the board is not displayed in the Selftest dialog.
An EEPROM test is provided for all modules.
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