Owners manual

System

4.13.2.2. Functional Block Diagram

MSGBOX_MSG_REG_M

MSGBOX_MSG_STATUS_REG_M

MSGBOX_FIFO_STATUS_REG_M

MSGBox Message Queue m (m

: from 0 to 7)

MSGBox

USER0 USER1

MSGBOX_IRQ_EN_REG_0

MSGBOX_IRQ_STATUS_REG_0

For user0

MSGBOX_CTRL_REG0

MSGBOX_IRQ_EN_REG_1

MSGBOX_IRQ_STATUS_REG_1

For user1

MSGBOX_CTRL_REG1

Four Message FIFO

Figure 4-8. Message Box Functional Block Diagram

4.13.3. Operation Principle

4.13.3.1. Message Queue Assignment

To transmit messages from a user to the other user through any Message Queue, set the corresponding bit in the

MSGBOX_CTRL_REG0/MSGBOX_CTRL_REG1 register.

When a 32-bit message is written to the MSGBOX_MSG_REG_M register, the message is appended into the FIFO queue.

This queue holds 4 messages. If the queue is full, the message is discarded. The receiver user could read the

MSGBOX_MSG_REG_M (m is the message queue number, where m=0 to 7) register to retrieve a message from the

corresponding Message Queue FIFO.

It is recommended that register polling be used for a user to send a message:

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