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apb.rst

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AMBA APB

Both APB3 and APB4 standards are supported.

Warning

Some IP vendors will incorrectly implement the address signalling assuming word-addresses. (that each increment of PADDR is the next word)

For this exporter, values on the interface's PADDR input are interpreted as byte-addresses. (an APB interface with 32-bit wide data increments PADDR in steps of 4 for every word). Even though APB protocol does not allow for unaligned transfers, this is in accordance to the official AMBA specification.

Be sure to double-check the interpretation of your interconnect IP. A simple bit-shift operation can be used to correct this if necessary.

APB3

Implements the register block using an AMBA 3 APB CPU interface.

The APB3 CPU interface comes in two i/o port flavors:

SystemVerilog Interface
  • Command line: --cpuif apb3
  • Interface Definition: apb3_intf.sv <../../hdl-src/apb3_intf.sv>
  • Class: peakrdl_regblock.cpuif.apb3.APB3_Cpuif
Flattened inputs/outputs

Flattens the interface into discrete input and output ports.

  • Command line: --cpuif apb3-flat
  • Class: peakrdl_regblock.cpuif.apb3.APB3_Cpuif_flattened

APB4

Implements the register block using an AMBA 4 APB CPU interface.

The APB4 CPU interface comes in two i/o port flavors:

SystemVerilog Interface
  • Command line: --cpuif apb4
  • Interface Definition: apb4_intf.sv <../../hdl-src/apb4_intf.sv>
  • Class: peakrdl_regblock.cpuif.apb4.APB4_Cpuif
Flattened inputs/outputs

Flattens the interface into discrete input and output ports.

  • Command line: --cpuif apb4-flat
  • Class: peakrdl_regblock.cpuif.apb4.APB4_Cpuif_flattened