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Sdtrig: Clarify that tinfo.version is a global constant, not per-trigger #1081

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Sdtrig: Clarify that tinfo.version is a global constant, not per-trigger #1081

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15 changes: 9 additions & 6 deletions xml/hwbp_registers.xml
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Original file line number Diff line number Diff line change
Expand Up @@ -166,8 +166,9 @@ same project unless stated otherwise.
</register>

<register name="Trigger Info" short="tinfo" address="0x7a4">
This register provides access to the trigger selected by {csr-tselect}.
The reset values listed here apply to every underlying trigger.
This register provides information about the implemented version of
the Sdtrig extension, and about the trigger types supported by
the trigger selected by {csr-tselect}.

This register is optional if no triggers are implemented, or if
{tdata1-type} is not writable and {tinfo-version} would be 0. In
Expand All @@ -176,7 +177,9 @@ same project unless stated otherwise.

<field name="0" bits="XLEN-1:32" access="R" reset="0" />
<field name="version" bits="31:24" access="R" reset="Preset">
Contains the version of the Sdtrig extension implemented.
Contains the version of the Sdtrig extension implemented. The read-only
value of this field refers to the implemented version of the whole
Sdtrig extension, and is unaffected by the value of {csr-tselect}.
<value v="0" name="0">
Supports triggers as described in this spec at commit 5a5c078,
made on February 2, 2023.
Expand All @@ -195,9 +198,9 @@ same project unless stated otherwise.
</field>
<field name="0" bits="23:16" access="R" reset="0" />
<field name="info" bits="15:0" access="R" reset="Preset">
One bit for each possible {tdata1-type} enumerated in {csr-tdata1}. Bit N
corresponds to type N. If the bit is set, then that type is
supported by the currently selected trigger.
One bit for each possible {tdata1-type} enumerated in {csr-tdata1}.
Bit N corresponds to type N. If the bit is set, then that type is
supported by the currently selected trigger (by {csr-tselect}).

If the currently selected trigger doesn't exist, this field
contains 1.
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