32 Keysight 34950A User’s Guide
Byte Ordering
When using buffered memory operations, the width of the data sets how the
memory data is interpreted. Changing the width of the first channel in a bank
invalidates any traces stored or captured.
Output Operations
For output operations (see page 25), traces are put into
memory using the TRACe:DATA:DIGital command.
For output operations, the data stored in memory is output as follows:
– BYTE output - first byte in memory on the first handshake, next byte in memory
on the second handshake, and so on.
– WORD output - first and second byte in memory on the first handshake, next
two bytes in memory on the second handshake, and so on.
– LWORd output - first four bytes in memory on the first handshake, next four
bytes in memory on the second handshake, and so on.
Note that for WORD outputs the first byte in memory is considered the most
significant byte and is output on the upper bits (8 through 15). For LWORd outputs
the first byte is output on bits 24 through 31.
You can change the byte order reported using the FORMat:BORDer command.
This command allows you to swap the most-significant and least-significant byte
ordering for all data transfer operations. The command is applied globally and
cannot be assigned to an individual slot or channel.
Input Operations
For input operations (see page page 27), bytes are read into
memory as follows:
– BYTE input - the first byte in memory was read on the first handshake, the next
byte in memory was read on the second handshake, and so on.
– WORD input - first and second byte in memory were read on the first handshake,
next two bytes in memory were read on the second handshake, and so on.
– LWORd input - first four bytes in memory were read on the first handshake, next
four bytes in memory were read on the second handshake, and so on.
Note that for WORD inputs the first byte in memory is considered the most
significant byte and was read on the upper bits (8 through 15). For LWORd inputs
the first byte was read on bits 24 through 31.
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