参数资料
型号: CORE1553BRT-RM
厂商: Microsemi SoC
文件页数: 44/74页
文件大小: 0K
描述: IP MODULE CORE1553 REMOTE TERM
标准包装: 1
系列: *
Testbench Operation and Modification
Using the VHDL QTBEncDec Module
You can instantiate the QTBEncDec module in your design and use it to initiate 1553B messages. The
top level of the module is shown in the code below, along with a description of these ports ( Table 6-5 ).
entity QTBENCDEC is
port ( CLK16 : in
RSTn : in
STOPCLK : in
START : in
QMSG : in
BUSY : out
QOUT : out
BUSPOS : inout
BUSNEG : inout
std_logic;
std_logic;
BOOLEAN;
BOOLEAN;
TQMSGREQ;
BOOLEAN;
TQMSGOUT;
std_logic;
std_logic
);
end QTBENCDEC;
Table 6-5 ? TBEncDec Port Descriptions
Port
CLK16
RSTn
Dir.
In
In
Type
std_logic
std_logic
Function
Clock source for the encoder and decoder; must be 16 MHz
Active low asynchronous reset; must be pulsed LOW at the start of
simulation
STOPCLK
In
BOOLEAN
The encoder has an internal clock generator; when this input is
TRUE, the clock generator is halted. This allows the simulator to
exit gracefully. This input can be tied permanently FALSE to
disable the STOPCLK feature.
START
In
BOOLEAN
This input is pulsed TRUE to start a 1553B message. If it is not
synchronized to a clock and only needs to be pulsed for a
simulation delta cycle, use the following code:
START <= TRUE;
wait for 0 ns;
START <= FALSE;
QMSG
In
TQMSGREQ
Input record structure that defines the message that will be
transmitted; see below
BUSY
QOUT
Out
Out
BOOLEAN
TQMSGOUT
Indicates that the encoder/decoder is busy
Output record structure containing message data transmitted on
the bus
BUSPOS
BUSNEG
Inout
Inout
std_logic
std_logic
Connects to the positive side of the 1553B bus
Connects to the negative side of the 1553B bus
To initiate a message, a simple record structure is set up and the START input is strobed. The module
asserts BUSY until the 1553B message is completed and then deasserts BUSY. The QOUT record
structure contains the data sent and received on the bus. The two record structures used here are shown
in Table 6-6 on page 45 and Table 6-7 on page 45 .
Revision 3
44
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