AHB transfers to APB source and APB read/write verilog code
power APB domain. The Bridge appears as a slave on AHB,
whereas on APB, it is the master. Read and write transfers on the AHB are
converted into corresponding transfers on the APB. As the APB is not
pipelined, wait states are added during transfers to and from the APB when
the AHB is required to wait for the APB protocol.
The AHB to APB Bridge comprises of a state machine, which is used to control
the generation of the APB and AHB output signals, and the address decoding
logic which is used to generate the APB peripheral select lines.
All registers used in the system are clocked from the rising edge of the
system clock HCLK, and use the asynchronous reset HRESETn
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