Specifications

1260-14 User Manual

Module Specific Syntax 3-24 EADS North America Defense

wide operations are specified on even-numbered ports only, and

place the least significant 8 bits in the even-numbered port and the

most significant 8 bits in the following odd-numbered port. Word-

wide operations may not be mixed with bit or byte-wide operations

in either the even or odd port.

Example 2:

Assume that ports 5-11 are defined as asynchronous and the user

sends the following command:

WR 1.8,W,H23A7

At the end of command execution, port 8 would be actively driving

a hex 23 and port 9 would be driving hex A7.

An "X" specifies a bit-wide write to the ports. Any of the 8 bits

within a port may be set to 0 (Low) or 1 (High) by using the form Lx

or Hx, where x is the bit (0-7) to modify within the byte. Multiple

bits within a port may be modified by separating the bit transitions

with commas. Multiple ports may be modified by separating the

changes for each port with semicolons. Bits that are not modified,

remain in their previous states. When writing to a synchronous

port that was previously defined or written to using a word width,

the data buffer associated with the companion port will be cleared

and the port will be disabled in future synchronous operations until

it is redefined.

Example 3:

Assume that all ports are asynchronous, the current value of port 0

and port 1 is a binary 00000000, and the user sends the following

statements to the module:

WR 1.0-1,X,H3;H1,H7

WR 1.0-1,L3,H5;L1,H6

After the execution of the first command, port 0 would be actively

driving a binary 00001000 and port 1 would be driving a 10000010.

After the second command, port 0 would be driving a 00100000

and port 2 would be driving a 11000000. Note that in the second

command, there was no width specified since it was not required.

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