EventCounter_versatile1

EventCounterVersatile Misc ↓ Params ↓ Ports ↓

This component is used to count events and present the count at the data output [Out]cnt. This is a more versatile version of the basic counter and can be incremented when the input event [In]inc is asserted or decremented when the input event [In]dec is asserted. A maximum and minimum threshold can be set by specifying the parameters Max. Threshold and Min. Threshold or by overriding the parameters by presenting values to the data inputs [In]max and [In]min respectively. Note that if a value of 0 is used for the Max. Threshold parameter then the Max. Threshold is set to 2147483647, which is the maximum permissible value.

An initial value for the count can be set by presenting a value to the data input [In]ini, if the port is not connected the Initial Value parameter value is used. Similarly a step size for each increment or decrement event can be set by presenting a value to the data input [In]step, if the port is not connected the Step Size parameter value is used. Note that the minimum step size is 1.

The [In]enable and [In]disable event inputs can be used to enable and disable the counter, meaning that the count will be incremented or decremented if and only if the counter is enabled. The [In]rst event input is used to reset the count to its initial value.

If the count exceeds the upper threshold then the overflow output event [Out]ovf is triggered, similarly if the count exceeds the lower threshold then the overflow output event [Out]ovf is triggered. If and only if the count does not exceed the thresholds when an increment or decrement event is asserted, then the corresponding output event will be triggered and the count value will be presented to the data output [Out]cnt.

The count will always be inside the bounds of the minimum and maximum thresholds. For example if the initial value is set to be greater than the maximum threshold, then the initial value will be capped at the maximum threshold, the same holds true for an initial value that is less than the minimum threshold.

At each increment, the count is only incremented if the sum of count value and the step size is less than or equal to the maximum threshold. The same rule applies to decrement events with respect to the minimum threshold. For example if the step size is 3, the count is 8 and the maximum threshold is 10, then on the next increment event the count will remain on 8 and the output event [Out]ovf will be triggered. If the step size is 2, the count is 8 and the maximum threshold is 10, then on the next increment event the count will incremented to 10 and the input event [In]inc will be triggered and a value of 10 presented to the data output [Out]cnt.

If the values presented to either of the data inputs [In]max or [In]min change then the new thresholds will be used on the next increment, decrement or reset events. If the value of the counter is greater than the new maximum threshold then the counter will be set to the maximum threshold and similarly if the the counter is less than the new minimum threshold then the counter will be set to the minimum threshold. Note that the counter value is changed to be within the new thresholds before the increment or decrement of its value. For example when the input event [In]inc is triggerred, if the counter value is below the new minimum threshold it will be set to the new minimum threshold and before its value is incremented and presented to the data output [Out]cnt.

Parameters

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Misc ↓

Ports ↓

name	type	default	min.	max.	description
Enable at Init	Boolean	1			Enable the counter at initialisation time if TRUE, else counter is disabled at initialisation time.
Initial Value	Integer	0	-2147483648	2147483647	Initial Value for count.
Step Size	Integer	1	1	2147483647	Value incremented/decremented on each count.
Max. Threshold	Integer	1000	-2147483648	2147483647	Threshold value for ovf event.
Min. Threshold	Integer	0	-2147483648	2147483647	Threshold value for ovf event.

Ports Top ↑ Misc ↓ Params ↑

hreshold.

In Ev.
rstc	Input event, resets the count to its intial value.
inc	Input event, triggers an increment of the counter and presents the count to the data output [Out]cnt
dec	Input event, triggers an decrement of the counter and presents the count to the data output [Out]cnt.
enable	Input event, the counter will register increment or decrement events after this event is triggered.
disable	Input event, the counter will not register increment or decrement events after this event is triggered.
Data In
ini	Data input, the initial value for the counter. Overrides the parameter Initial Value.
step	Data input, the value by which the count is incremented or decremented by. Overrides the parameter Step Size.
max	Data input, the maximum threshold for the counter. Overrides the parameter Max. Threshold.
min	Data input, the minimum threshold for the counter. Overrides the parameter Min. Threshold.
Data Out
cnt	Data output, the current count.
Out Ev.
	Output event, is asserted if and only if an increment event is received and the count is less than the maximum threshold.
	Output event, is asserted if and only if a decrement event is received and the count is greater than the minimum threshold.
	Output event, is asserted if and only if a decrement event is received and the count is greater than the minimum threshold.
	Output event.
	Output event.
	Output event.
ovf	Output event, is asserted if and only if an increment event is received and the count is equal to or greater than the maximum threshold.
inc	Asserted if and only if an increment event is received and the count is less than the maximum threshold.

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State Machine	None
Toolbox	Core	Version	v1.0.
Licence Type	MPL2.0	Component Supplier	inx ltd.
Minumum DCC	A0000	Profiles	All.