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Testbench Operation and Modification
Table 6-8 ? Verilog Testbench Modules
Source
Module
QTBENCH
QTBENCDEC
QRTSYSTEM
QTBBACKEND
CWLEGALITY
Provided
Yes
No
Yes
Yes
Yes
Description
The testbench top level. This contains the bus control function and
several remote terminals.
Test block that emulates a bus controller. This transmits 1553B command
and data words and then decodes the status and data words generated
by an RT in response.
Hierarchical block with the core plus a transceiver, backend, and
command word legality block to the core
This connects to the core backend interface and provides the following
functions:
1. Implements an asynchronous 2k×16 or 8k×16 memory block
providing the 32 receive and transmit subaddresses.
2. Has a built-in address mapping function.
3. Loops back the receive subaddress locations to the transmit
memory. On a good message received, interrupts the correctly
received words copied from the RX subaddress to the TX
subaddress. If the address mapping function is enabled, the
“synchronize with data” word is copied to the transmit vector word
memory location.
4. Generates the interrupt acknowledge.
5. Implements external command validity checking
The testbench uses a command word legality module that disables subaddresses 26 and 27 for transmit
commands. For receive commands, subaddress 25 is disabled, and subaddress 27 is only enabled for
word counts 1 to 9. "External Command Word Legality Example" on page 54 gives the source code for a
command legality module implementing this behavior.
The Core1553B Model Sim library (in the mti/user_vlog directory) contains compiled models for the
complete environment. Design source code of the top-level blocks is provided (in the source directory) to
enable you to create your own simulation environment using this testbench as a starting point. Examine
the source files for QTBENCH and QRTSYSTEM to obtain a full understanding of the core operation.
QTBENCH has a top-level parameter, CMODE, that can be set to 0 or 1. When 0, the core is configured
with WRTTSW, WRTCMD, and EXTMDATA set to '100'. When 1, these values are set to '011', and the
backend module implements an address mapper function as described in "Implementation Hints" on
page 53 .
Revision 3
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