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 66. Command and Response Header Format
LengthID 0 0 Command/Error Code
012345678910111213141516171819202122232425262728293031
Reserved
Note: The LENGTH field in the command header must match the command length of corresponding command. Your client must read
all the response words, even if your client does not interpret all the response words.
The following table describes the fields of the header command.
Table 40. 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. Refer to
Operation Commands for command descriptions.
0
[23] Reserved.
continued...
5. Remote System Update (RSU)
683673 | 2021.10.29
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