A83T
A83T User Manual(Revision 1.5.1) Copyright© 2015 Allwinner Technology Co., Ltd. All Rights Reserved. Page 16
3.12. GIC ............................................................................................................................................................. 171
3.12.1. Interrupt Source ................................................................................................................................ 171
3.13. Message Box .............................................................................................................................................. 176
3.13.1. Overview ........................................................................................................................................... 176
3.13.2. Functionalities Description ................................................................................................................ 176
3.13.2.1. Typical Applications ................................................................................................................. 176
3.13.2.2. Functional Block Diagram ........................................................................................................ 178
3.13.3. Operation Principle ........................................................................................................................... 179
3.13.3.1. Message Box clock gating and software reset ......................................................................... 179
3.13.3.2. Message Queue Assignment ................................................................................................... 179
3.13.3.3. Interrupt request ..................................................................................................................... 179
3.13.3.4. Transmit and receive messages ............................................................................................... 179
3.13.4. Message Box Register List ................................................................................................................. 180
3.13.5. Message Box Register Description .................................................................................................... 180
3.13.5.1. MSGBox Control Register 0(Default Value: 0x10101010) ....................................................... 180
3.13.5.2. MSGBox Control Register 1(Default Value: 0x10101010) ....................................................... 181
3.13.5.3. MSGBox IRQ Enable Register u(u=0,1)( Default Value: 0x00000000) ..................................... 182
3.13.5.4. MSGBox IRQ Status Register u(Default Value: 0x0000AAAA) .................................................. 184
3.13.5.5. MSGBox FIFO Status Register m(Default Value: 0x00000000) ................................................ 186
3.13.5.6. MSGBox Message Status Register m(Default Value: 0x00000000) ......................................... 186
3.13.5.7. MSGBox Message Queue Register m(Default Value: 0x00000000) ........................................ 186
3.13.6. Programming Guidelines ................................................................................................................... 186
3.14. Spinlock ..................................................................................................................................................... 188