Interface Descriptions
Table 3-1 ? Core1553BRT Parameters (continued)
Parameter
BCASTEN
SA30LOOP
ASYNCIF
INTENBBR
TESTTXTOUTEN
INITLASTSW
EXTERNAL_BIST
Range
0 or 1
0 or 1
0 or 1
0 or 1
0 or 1
0 or 1
0 or 1
Description
This input enables broadcast operation.
When 1, broadcast operations are enabled.
When 0, broadcast messages (i.e., RT address 31) are treated as
normal messages. If the RTADDR input is set to 31, the RT will respond
to the message.
This input alters the backend memory mapping so that subaddress 30
provides automatic loopback.
When 0, the RT does not loop back subaddress 30. Separate memory
buffers are used for transmit and receive data buffers.
When 1, the RT maps the transmit memory buffer for subaddress 30 to
the receive memory buffer for subaddress 30; i.e., the upper address
line is forced to 0.
When 1, the backend interface is in asynchronous mode.
When 0, the backend interface is in synchronous mode.
When active (1), the core generates interrupts when both good and bad
1553B messages are received.
When inactive (0), the core only generates interrupts when good
messages are received.
This enables the TESTTXTOUT input; it is for test use only. This
parameter should be set to 0 if it is not required to be able to force
transmission overrun for testing the internal transmit timer.
This input controls the last status word.
When 0, the first received command is a transmit last status word. The
core will respond with an undefined status word since no status word
has previously been sent (same function as previous core versions.)
When 1, the first received command is a transmit last status word. The
core will respond with a valid RT address and all other status bits zero,
even though no status word was previously sent. It requires PURSTN to
be asserted at power-up.
The default value of INITLASTSW is 0.
This parameter controls the mode code 19 support.
When 0, the internal BIST value as specified in Table 5-6 on page 34 is
returned in response to the Transmit BIST mode code.
When 1, the input BITIN [15:0] is returned in response to the Transmit
BIST mode code.
The default value of EXTERNAL_BIST is 0.
Revision 3
14
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