Reduced instruction set baseband controller
In wireless communications such as in the Bluetooth communication system, an execution unit sequentially receives software instructions for execution. Prior to completing each instruction, the execution unit issues an interrupt indicating the upcoming completion of the instruction execution and awaits receipt of the next instruction. A Link Manager issues limited instructions, and a Link Controller includes a hardware execution unit for executing the limited instructions. A processing unit in the Link Manager performs remaining functions under control of a software program.
1. A wireless communication device for efficient implementation of functions defined by a Bluetooth wireless communication protocol comprising:
a Link Manager including a processing unit;
a Link Controller including a hardware execution unit for executing time critical instructions issued by the Link Manager, wherein the time critical instructions are limited to performing the functions of establishing an ACL link, establishing an SCO link, paging, responding to a page, inquiry, scanning for inquiry, responding to the scanning for inquiry, polling unparked devices, unparking devices, and idle; and
wherein the Link Manager performs non-time critical functions using a computer software program running on the processing unit.
2. The device of claim 1 wherein the Link Controller executes the instructions and issues an interrupt signaling a completion of the instruction before the instruction execution is actually complete.
3. The device of claim 1 , wherein the processing unit is a microprocessor.
4. The device of claim 1 , wherein each of the time critical instructions are completed in less than 1 ms.
5. A wireless communication device for efficient implementation of functions defined by a Bluetooth wireless communication protocol comprising:
a Link Manager including a processing unit;
an instruction register coupled to the Link Manager;
a Link Controller coupled to the instruction register and including a hardware execution unit, wherein the Link Manager issues instructions to the instruction register and the Link Controller reads instructions from the instruction register;
wherein the instructions are limited to those functions that are time critical; and
wherein the processing unit in the Link Manager performs non-time critical functions using a computer software program running on the processor.
6. The device of claim 5 wherein the instructions are limited to those function of establishing an ACL link, establishing an SCO link, paging, responding to a page, inquiry, scanning for inquiry, responding to the scanning for inquiry, polling unparked devices, unparking devices, and idle.
7. The device of claim 5 further comprising:
executing the instructions in the Link Controller; and
prior to completing executing the instructions, issuing and interrupt to the Link Manager signalling that the instruction is nearly complete.
8. The device of claim 5 , wherein the processing unit is a microprocessor.
9. The device of claim 5 , wherein the functions that are time critical are completed in less than 1 ms.