structure

嵌入式系统设计与实例开发源码

L3 Bus Driver
-------------

The structure of the driver is as follows:

	+----------+	+----------+	+----------+
	| client 1 |	| client 2 |	| client 3 |
	+-----^----+	+----^-----+	+----^-----+
	      |		     |               |
	+-----v--------------v---------------v-----+
	|                                          |
	+-----^-------+              +-------^-----+
	      |	      |     core     |       |
	+-----v----+  |	             |  +----v-----+
	| device   |  |	             |  | device   |
	| driver 1 |  |              |	| driver 2 |
	+-----^----+  |              |  +----^-----+
	      |	      |	  services   |       |
	+-----v-------+              +-------v-----+
	|                                          |
	+-----------------^----^-------------------+
			  |    |
			  |  +-v---------+
			  |  | algorithm |
			  |  |  driver   |
			  |  +-v---------+
			  |    |
			+-v----v-+
			|  bus   |
			| driver |
			+--------+

Clients talk to the core to attach device drivers and bus adapters, and
to instruct device drivers to perform actions.  Device drivers then talk
to the core to perform L3 bus transactions via the algorithm driver and
ultimately bus driver.