Mailbox Client Role
Avalon-MM
Interface
IRQ
SDM
Communication
Hub
Mailbox
Driver
Secure
Device
Manager
Avalon-ST
Interface
Host Controller
FPGA Core Fabric
Controller
FIFO
FIFO
JTAG
to
Avalon Master
Processor
Custom
Logic
Nios II
Mailbox Client Intel FPGA IP
Figure 58. Command and Response Header Format
31 30
RESERVED ID 0 0 COMMAND / ERROR CODELENGTH
29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Note: The LENGTH field in the command header must match the command length of corresponding command.The following table
describes the fields of the header command. Your client must read all the response words, even if your client does not
interpret all the response words.
Table 34. Mailbox Client Intel FPGA IP Command and Response Header Description
Header Bit Description
Reserved [31:28] Reserved.
ID
[27:24] The command ID. The response header returns the ID specified in the command header. Set different
IDs in each command to match responses with commands.
0
[23] Reserved.
continued...
4. Remote System Update (RSU)
UG-20205 | 2019.10.09
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