Chaining more than 2 triggers
Joe Rahmeh
Tim Newsome
Is it possible to chain more than 2 triggers? If it is not possible, then what should happen if the user attempts to set the chain bit of two or more consecutive triggers?
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bruce.ableidinger
What defines chaining as ANDing (e.g. trigA & trigB such as data triggering) vs. sequential (e.g. trigA followed by trigB)?
--- Bruce
From: Tim Newsome <t...@sifive.com>
Sent: Tuesday, July 3, 2018 2:24 PM
To: Joe Rahmeh <joe.r...@gmail.com>
Cc: RISC-V Debug Group <de...@groups.riscv.org>
Subject: Re: [debug] Chaining more than 2 triggers
An implementation may support chaining more than 2 triggers, but it doesn't have to. (This is true for almost any trigger feature.) It's expected that if the debugger writes a trigger that's not supported, it reads back something that is supported (WARL). I'll clarify that in the spec. A simple way to limit chain length is an implementation is wire the chain bit to 0 for every odd (or every 4th, etc) trigger to 0.
Tim
On Tue, Jul 3, 2018 at 2:07 PM, Joe Rahmeh <joe.r...@gmail.com> wrote:
Is it possible to chain more than 2 triggers? If it is not possible, then what should happen if the user attempts to set the chain bit of two or more consecutive triggers?
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Tim Newsome
I think it’s the “while” in mcontrol.chain:
1: While this trigger does not match, it prevents
the trigger with the next index from matching.
If that’s not clear, I’m open to suggestions.
Tim
What defines chaining as ANDing (e.g. trigA & trigB such as data triggering) vs. sequential (e.g. trigA followed by trigB)?
--- Bruce
From: Tim Newsome <t...@sifive.com>
Sent: Tuesday, July 3, 2018 2:24 PM
To: Joe Rahmeh <joe.r...@gmail.com>
Cc: RISC-V Debug Group <de...@groups.riscv.org>
Subject: Re: [debug] Chaining more than 2 triggers
An implementation may support chaining more than 2 triggers, but it doesn't have to. (This is true for almost any trigger feature.) It's expected that if the debugger writes a trigger that's not supported, it reads back something that is supported (WARL). I'll clarify that in the spec. A simple way to limit chain length is an implementation is wire the chain bit to 0 for every odd (or every 4th, etc) trigger to 0.
Tim
On Tue, Jul 3, 2018 at 2:07 PM, Joe Rahmeh <joe.r...@gmail.com> wrote:
Is it possible to chain more than 2 triggers? If it is not possible, then what should happen if the user attempts to set the chain bit of two or more consecutive triggers?
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Joe Rahmeh
On Tuesday, July 3, 2018 at 4:48:18 PM UTC-5, Tim Newsome wrote:
I think it’s the “while” in mcontrol.chain:
1: While this trigger does not match, it prevents
the trigger with the next index from matching.If that’s not clear, I’m open to suggestions.
Tim
On Tue, Jul 3, 2018 at 2:36 PM, bruce.ableidinger <bruce.ab...@gmail.com> wrote:
What defines chaining as ANDing (e.g. trigA & trigB such as data triggering) vs. sequential (e.g. trigA followed by trigB)?
--- Bruce
From: Tim Newsome <t...@sifive.com>
Sent: Tuesday, July 3, 2018 2:24 PM
To: Joe Rahmeh <joe.r...@gmail.com>
Cc: RISC-V Debug Group <de...@groups.riscv.org>
Subject: Re: [debug] Chaining more than 2 triggers
An implementation may support chaining more than 2 triggers, but it doesn't have to. (This is true for almost any trigger feature.) It's expected that if the debugger writes a trigger that's not supported, it reads back something that is supported (WARL). I'll clarify that in the spec. A simple way to limit chain length is an implementation is wire the chain bit to 0 for every odd (or every 4th, etc) trigger to 0.
Tim
On Tue, Jul 3, 2018 at 2:07 PM, Joe Rahmeh <joe.r...@gmail.com> wrote:
Is it possible to chain more than 2 triggers? If it is not possible, then what should happen if the user attempts to set the chain bit of two or more consecutive triggers?
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Tim Newsome
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apr...@gmail.com
Tim, could you confirm/clarify that this actually means that the individual action of all the triggers in the chain are ignored unless all the triggers in the chain match simultaneously? A true AND function?
Or does it truly mean that the action of the final trigger is dependent on all the prior triggers, but the prior triggers may have independent action?
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Tim Newsome
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apr...@gmail.com
This makes sense.
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