14
BC Message
Message Table
BUS CONTROLLER MEMORY ORGANIZATION
The message concept employs major and minor frames, message address tables, BC messages and data tables. This
approach provides the BC with flexibility, autonomy and data buffering.
BCU FRAME STRUCTURE
Message Structures
Message Tag
Message Control
Command Word
Message Time Word
Data_Table_1_Adr
63 Max
Data Control Word
Time Tag
Time Tag
Data Words
Status
Data Table
Receive Command
Message Tag
Message Control
Transmit Command
Message Time Word
Data_Table_1_Adr
63 Max
Addresses Max
Data Control
Word
Time Tag
Time Tag
Status
Data Words
Data Table
Transmit Command
Minor Frame
Minor Frame
Length
Msg_Addr_1_Ptr
255 Max
Msg_1_Addr
N
Addresses
Message
Address Table
Major Frame
Address Reg
Major Frame
Major_Frame_Length
Minor_Frm_1_Adr
255 Max
BC
Message
