diff options
Diffstat (limited to 'src/sim/clocked_object.hh')
| -rw-r--r-- | src/sim/clocked_object.hh | 31 |
1 files changed, 21 insertions, 10 deletions
diff --git a/src/sim/clocked_object.hh b/src/sim/clocked_object.hh index fb020f567..d878f4704 100644 --- a/src/sim/clocked_object.hh +++ b/src/sim/clocked_object.hh @@ -79,7 +79,8 @@ class ClockedObject : public SimObject ClockedObject& operator=(ClockedObject&); /** - * Align cycle and tick to the next clock edge if not already done. + * Align cycle and tick to the next clock edge if not already done. When + * complete, tick must be at least curTick(). */ void update() const { @@ -154,13 +155,18 @@ class ClockedObject : public SimObject } /** - * Determine the tick when a cycle begins, by default the current - * one, but the argument also enables the caller to determine a - * future cycle. + * Determine the tick when a cycle begins, by default the current one, but + * the argument also enables the caller to determine a future cycle. When + * curTick() is on a clock edge, the number of cycles in the parameter is + * added to curTick() to be returned. When curTick() is not aligned to a + * clock edge, the number of cycles in the parameter is added to the next + * clock edge. * * @param cycles The number of cycles into the future * - * @return The tick when the clock edge occurs + * @return The start tick when the requested clock edge occurs. Precisely, + * this tick can be + * curTick() + [0, clockPeriod()) + clockPeriod() * cycles */ inline Tick clockEdge(Cycles cycles = Cycles(0)) const { @@ -175,7 +181,9 @@ class ClockedObject : public SimObject * Determine the current cycle, corresponding to a tick aligned to * a clock edge. * - * @return The current cycle count + * @return When curTick() is on a clock edge, return the Cycle corresponding + * to that clock edge. When curTick() is not on a clock edge, return the + * Cycle corresponding to the next clock edge. */ inline Cycles curCycle() const { @@ -186,11 +194,14 @@ class ClockedObject : public SimObject } /** - * Based on the clock of the object, determine the tick when the next - * cycle begins, in other words, return the next clock edge. - * (This can never be the current tick.) + * Based on the clock of the object, determine the start tick of the first + * cycle that is at least one cycle in the future. When curTick() is at the + * current cycle edge, this returns the next clock edge. When calling this + * during the middle of a cycle, this returns 2 clock edges in the future. * - * @return The tick when the next cycle starts + * @return The start tick of the first cycle that is at least one cycle in + * the future. Precisely, the returned tick can be in the range + * curTick() + [clockPeriod(), 2 * clockPeriod()) */ Tick nextCycle() const { return clockEdge(Cycles(1)); } |