86 lines
2.1 KiB
ReStructuredText
86 lines
2.1 KiB
ReStructuredText
Introduction
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============
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Although the official SystemRDL spec defines numerous properties that allow you
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to define complex register map structures, sometimes they are not enough to
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accurately describe a necessary feature. Fortunately the SystemRDL spec allows
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the language to be extended using "User Defined Properties" (UDPs). The
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PeakRDL-busdecoder tool understands several UDPs that are described in this
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section.
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To enable these UDPs, compile this RDL file prior to the rest of your design:
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:download:`busdecoder_udps.rdl <../../hdl-src/busdecoder_udps.rdl>`.
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.. list-table:: Summary of UDPs
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:header-rows: 1
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* - Name
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- Component
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- Type
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- Description
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* - buffer_reads
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- reg
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- boolean
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- If set, reads from the register are double-buffered.
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See: :ref:`read_buffering`.
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* - rbuffer_trigger
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- reg
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- reference
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- Defines the buffered read load trigger.
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See: :ref:`read_buffering`.
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* - buffer_writes
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- reg
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- boolean
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- If set, writes to the register are double-buffered.
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See: :ref:`write_buffering`.
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* - wbuffer_trigger
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- reg
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- reference
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- Defines the buffered write commit trigger.
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See: :ref:`write_buffering`.
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* - rd_swacc
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- field
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- boolean
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- Enables an output strobe that is asserted on sw reads.
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See: :ref:`extended_swacc`.
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* - wr_swacc
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- field
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- boolean
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- Enables an output strobe that is asserted on sw writes.
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See: :ref:`extended_swacc`.
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* - is_signed
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- field
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- boolean
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- Defines the signedness of a field.
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See: :ref:`signed`.
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* - intwidth
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- field
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- unsigned integer
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- Defines the number of integer bits in the fixed-point representation
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of a field.
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See: :ref:`fixedpoint`.
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* - fracwidth
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- field
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- unsigned integer
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- Defines the number of fractional bits in the fixed-point representation
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of a field.
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See: :ref:`fixedpoint`.
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