Specifications

1260-14 User Manual

Module Specific Syntax 3-20 EADS North America Defense

operations. When a width change is requested by using either the

"W", "X" or "Y" width designator, the port’s buffer is cleared of all

previous data and the new data is loaded starting at vector 1. If

there is no width designator, the port remains in its current mode,

and the new data is appended to the existing data in the buffer for

up to a maximum of 256 vectors of data. This means that multiple

statements may be used to load a given port’s buffer by specifying

a width for the first SETUP WR statement, and not specifying a

width for subsequent statements.

Example 1:

Assume the user sends the following three statements to the

module:

SETUP 1.WR 0,Y,7,15,23

SETUP 1.WR 0,255

SETUP 1.WR 0,100

The first SETUP statement would set up port 0 to perform byte-

wide operations and would clear the port 0 buffer of any previous

values. It would then load a 7 in vector 1, a 15 in vector 2 and a 23

in vector 3. The second SETUP statement would leave the buffer

intact, and would load a 255 in vector 4. The final SETUP

statement would load a 100 in vector 5. Once the test was armed,

port 0 would be actively driving a 7 after the first clock, a 15 after

the second, etc. and would end the test driving a 100.

The data that is loaded in the buffer remains there until either the

port is re-initialized by a SETUP WR or a WRITE command, the

port is redefined to be a read port, the port is redefined to be an

asynchronous port, or the unit is reset. This means that it is

possible to arm and run a test multiple times without having to

reload the write data.

Bit, byte and word-wide operations cannot be mixed in a port. Only

one width may be active at a time and is specified as follows:

A "Y" specifies a byte-wide (8-bit) write to a port. If the port was

previously defined using a word width, the data associated with the

companion port will be cleared, and the port will be disabled in

future synchronous operations until redefined. When a port is first

defined as synchronous, it defaults to byte-wide operations, so it is

only necessary to specify a byte width if the user is changing from

a different width, or wishes to clear the buffer. See Example 1

above for a sample of a byte-wide synchronous write setup.

A "W" specifies a word-wide (16-bit) write to a pair of ports. Word-

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