Core1553BRT v4.0 Handbook
Command Legalization Interface
1553B commands can be legalized in two ways with Core1553BRT. For RTL versions, one of the
modules in the source code can be edited to legalize or make illegal command words based on the
subaddress, mode code, word count, or broadcast fields of the command word. For Obfuscated and RTL
versions, external logic can be used to decode the legal/illegal command words ( Figure 5-4 ).
Core1553BRT
USEEXTOK
CMDVAL[11:0]
CMDOK
'1'
User
Customization
Logic
Microsemi FPGA
Figure 5-4 ? Command Legalization Logic
The user customization logic block takes in CMDVAL and simply sets CMDOK for all legal command
words. The CMDVAL encoding is given in Table 5-7 . The external logic must implement this function
within 3 μs.
Table 5-7 ? CMDVAL Encoding
Bit(s)
11
10
Function
Broadcast
Transmit or
Receive
Description
'1' indicates broadcast; i.e., the RT address was set to 31 in the 1553B
command word.
TX/RX field from the 1553B command word. '0' indicates receive and '1'
transmit.
9:5
4:0
Subaddress Subaddress field from the 1553B command word
Word Count Word count field from the 1553B command word. When the subaddress is 0 or
Mode Code
31, this contains the 1553B mode code.
Revision 3
35
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