simuhw.counter package

Module contents

class simuhw.counter.Counter(width: int)

Bases: Device

The super class for all counters.

__init__(width: int) → None

Creates a counter.

Parameters:

width – The data word width in bits.

property port_co: OutputPort

The carry output port.

property port_d: InputPort

The load input port.

property port_q: OutputPort

The count output port.

reset() → None

Resets the states.

property width: int

The data word width in bits.

class simuhw.counter.SynchronousCounter(width: int, *, neg_edged: bool)

Bases: Counter

The super class for all synchronous counters.

__init__(width: int, *, neg_edged: bool) → None

Creates a synchronous counter.

Parameters:

• width – The data word width in bits.

• neg_edged – True if negative-edged, False otherwise.

property negative_edged: bool

True if negative-edged, False otherwise.

property port_ck: InputPort

The clock port.

reset() → None

Resets the states.

class simuhw.counter.SynchronousBinaryCounter(width: int, *, neg_edged: bool)

Bases: SynchronousCounter

The super class for all synchronous binary counters.

__init__(width: int, *, neg_edged: bool) → None

Creates a synchronous binary counter.

Parameters:

• width – The data word width in bits.

• neg_edged – True if negative-edged, False otherwise.

class simuhw.counter.SynchronousBinaryCounter74161(width: int)

Bases: SynchronousBinaryCounter

A synchronous binary counter 74161 with arbitrary bits.

This device behaves like the logic IC 74161 with no timing delay and with arbitrary counter bits.

Truth Table:

+-----------------------------------+-----------+-----------------------+
|           Inputs                  |  Outputs  |                       |
+-----+-----+-----+-----+-----+-----+-----+-----+       Function        |
| clr |load |  d  | enp | ent | ck  |  q  | co  |                       |
+-----+-----+-----+-----+-----+-----+-----+-----+-----------------------+
|  L  |  X  |  X  |  X  |  X  |  X  |  L  |  L  | Resets count to 0.    |
|  H  |  L  | H/L |  X  |  X  | Rise| H/L |  L  | Presets count with d. |
|  H  |  H  |  X  |  X  |  L  | Rise| H/L | H/L | No change.            |
|  H  |  H  |  X  |  L  |  X  | Rise| H/L | H/L | No change.            |
|  H  |  H  |  X  |  H  |  H  | Rise| H/L | H/L | Counts up.            |
|  H  |  X  |  X  |  X  |  X  | Fall| H/L | H/L | No change.            |
+-----+-----+-----+-----+-----+-----+-----+-----+-----------------------+

__init__(width: int) → None

Creates a synchronous binary counter 74161 with arbitrary bits.

Parameters:

width – The data word width in bits.

property port_clr: InputPort

The clear port.

Active if the data word is 0.

property port_enp: InputPort

The count enable port.

Active if the data word is 1.

property port_ent: InputPort

The carry input port.

property port_load: InputPort

The load enable port.

Active if the data word is 0.

reset() → None

Resets the states.

work(time: float | None) → tuple[list[InputPort], float | None]

Makes the device work.

Parameters:

time – The current time in seconds. None when starting to make the device work.

Returns:

A tuple of the list of the input ports that are to be watched receive a data word, and the next resuming time in seconds. The next resuming time can be None if resumable anytime.

class simuhw.counter.SynchronousBinaryCounter74163(width: int)

Bases: SynchronousBinaryCounter

A synchronous binary counter 74163 with arbitrary bits.

This device behaves like the logic IC 74163 with no timing delay and with arbitrary counter bits.

Truth Table:

+-----------------------------------+-----------+-----------------------+
|           Inputs                  |  Outputs  |                       |
+-----+-----+-----+-----+-----+-----+-----+-----+       Function        |
| clr |load |  d  | enp | ent | ck  |  q  | co  |                       |
+-----+-----+-----+-----+-----+-----+-----+-----+-----------------------+
|  L  |  X  |  X  |  X  |  X  | Rise|  L  |  L  | Resets count to 0.    |
|  H  |  L  | H/L |  X  |  X  | Rise| H/L |  L  | Presets count with d. |
|  H  |  H  |  X  |  X  |  L  | Rise| H/L | H/L | No change.            |
|  H  |  H  |  X  |  L  |  X  | Rise| H/L | H/L | No change.            |
|  H  |  H  |  X  |  H  |  H  | Rise| H/L | H/L | Counts up.            |
|  H  |  X  |  X  |  X  |  X  | Fall| H/L | H/L | No change.            |
+-----+-----+-----+-----+-----+-----+-----+-----+-----------------------+

__init__(width: int) → None

Creates a synchronous binary counter 74163 with arbitrary bits.

Parameters:

width – The data word width in bits.

property port_clr: InputPort

The clear port.

Active if the data word is 0.

property port_enp: InputPort

The count enable port.

Active if the data word is 1.

property port_ent: InputPort

The carry input port.

property port_load: InputPort

The load enable port.

Active if the data word is 0.

reset() → None

Resets the states.

work(time: float | None) → tuple[list[InputPort], float | None]

Makes the device work.

Parameters:

time – The current time in seconds. None when starting to make the device work.

Returns:

A tuple of the list of the input ports that are to be watched receive a data word, and the next resuming time in seconds. The next resuming time can be None if resumable anytime.