AHB is a new generation of AMBA bus which is intended to address the requirements of high-performance synthesizable designs. AMBA AHB is a new level of bus which sits above the APB and implements the features required for high-performance, high clock frequency systems including:
• burst transfers
• split transactions
• single cycle bus master handover
• single clock edge operation
• non-tristate implementation
• wider data bus configurations (64/128 bits).
APB没有流水操作，AHB就是通过添加这个来完成的！
只有等上一个transfer完毕后，才会仲裁下一个！ burst就是连续访问的16个byte（0、4、8、C、10、14、18、1C、、、），连续触发！提出这个burst但是没怎么用！ 因为仲裁的原因，超长的仲裁周期，在公司中基本上不用AHB的burst，而AXI这里做好了！
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