Component - Digital Multiplexer and De-Multiplexer V1.0 Datasheet.pdf

PSoC® Creator™ Component Datasheet
Digital Multiplexer and De-Multiplexer
1.0
Features
 Digital Multiplexer
 Digital De-Multiplexer
 Up to 16 channels
General Description
The Multiplexer component is used to select 1 of n inputs while the De-Multiplexer component is
used to route 1 signal to n outputs.
The Multiplexer component implements a 2 to 16 input mux providing a single output, based on
hardware control signals. The De-Multiplexer component implements a 2 to 16 output demux
from a single input, based on hardware control signals. Only one input or output connection may
be made at a time.
When to Use a Multiplexer
Use the Multiplexer and De-Multiplexer components any time a digital signal must be
dynamically routed under firmware or hardware control. The most common control method is to
connect the mux select signals to a control register using a bus. The control register is then used
to select the input or output for the mux/demux. Another option is to drive the select signals from
hardware control logic to provide dynamic hardware routing.
Input/Output Connections
This section describes the various input and output connections for the Multiplexer and DeMultiplexer. An asterisk (*) in the list of I/Os indicates that the I/O may be hidden on the symbol
under the conditions listed in the description of that I/O.
Multiplexer
0-n – Inputs
Inputs to the Multiplexer, only one of which gets routed to the output based on the select input.
The number of inputs depends on the size of the multiplexer.
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Document Number: 001-50455 Rev. *E
Revised July 13, 2015
Digital Multiplexer and De-Multiplexer
PSoC® Creator™ Component Datasheet
Output 0
Output from the Multiplexer that is driven from the selected input.
select – Input
Selects input as source for the Multiplexer or output as destination for the De-Multiplexer. The
width of the select input depends on the number of inputs and outputs.
De-Multiplexer
0 – Input
Input to the De-Multiplexer that gets routed to one of n outputs.
Outputs 0-n
Outputs from the De-Multiplexer, only one of which is driven based on the select input. The
number of outputs depends on the size of the de-multiplexer. The number of outputs must be a
power of 2. Not all outputs must be connected.
select – Input
Selects input as source for the Multiplexer or output as destination for the De-Multiplexer. The
width of the select input depends on the number of inputs and outputs.
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Document Number: 001-50455 Rev. *E
PSoC® Creator™ Component Datasheet
Digital Multiplexer and De-Multiplexer
Component Parameters
Drag a Multiplexer or De-Multiplexer onto your design and double-click it to open the Configure
dialog.
Figure 1. Configure Multiplexer Dialog
Figure 2. Configure De-Multiplexer Dialog
The Multiplexer and De-Multiplexer provide the following parameters.
Document Number: 001-50455 Rev. *E
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Digital Multiplexer and De-Multiplexer
PSoC® Creator™ Component Datasheet
NumInputTerminals
This parameter determines the number of Multiplexer inputs. The default is 4. Acceptable values
are 2, 4, 8, and 16 and the corresponding select input widths are 1, 2, 3, and 4. Unused input
terminals may be left floating and, if selected, will be interpreted with a value of 0.
NumOutputTerminals
This parameter determines the number of De-Multiplexer outputs. The default is 4. Acceptable
values are 2, 4, 8, and 16 and the corresponding select input widths are 1, 2, 3, and 4. Unused
output terminals may be left floating.
TerminalWidth
You can create an array of parallel Multiplexers or De-Multiplexers, which may be useful when
the inputs and outputs are buses. This parameter defines the bus width of the inputs and
outputs. The default is 1. The range of valid values is 1 to 32, inclusive. The width of the select
input is not affected by this parameter.
Resources
The Multiplexer and De-Multiplexer are implemented with logic equations in macrocells. The
product of the component size and width determines the size of the logic equations, and
therefore, the number of macrocells.
Sample Firmware Source Code
PSoC Creator provides numerous example projects that include schematics and example code
in the Find Example Project dialog. For component-specific examples, open the dialog from the
Component Catalog or an instance of the component in a schematic. For general examples,
open the dialog from the Start Page or File menu. As needed, use the Filter Options in the
dialog to narrow the list of projects available to select.
Refer to the “Find Example Project” topic in the PSoC Creator Help for more information.
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Document Number: 001-50455 Rev. *E
PSoC® Creator™ Component Datasheet
Digital Multiplexer and De-Multiplexer
Functional Description
Multiplexer
The Multiplexer selects one of several inputs based on the select input. A letter ‘X’ in the truth
table indicates that the input does not affect the output.
Table 1. Four-Input Multiplexer Truth Table
Select[1] Select[0] Input 3 Input 2 Input 1 Input 0 Output
0
0
X
X
X
0
0
0
0
X
X
X
1
1
0
1
X
X
0
X
0
0
1
X
X
1
X
1
1
0
X
0
X
X
0
1
0
X
1
X
X
1
1
1
0
X
X
X
0
1
1
1
X
X
X
1
De-Multiplexer
The De-Multiplexer selects one of several outputs based on the select input. The value of the
selected output is the value of the input. The value of unselected outputs is false.
Table 2. Four-Output De-multiplexer Truth Table
Select[1] Select[0] Input Output 3 Output 2 Output 1 Output 0
0
0
0
0
0
0
0
0
0
1
0
0
0
1
0
1
0
0
0
0
0
0
1
1
0
0
1
0
1
0
0
0
0
0
0
1
0
1
0
1
0
0
1
1
0
0
0
0
0
1
1
1
1
0
0
0
Document Number: 001-50455 Rev. *E
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PSoC® Creator™ Component Datasheet
Digital Multiplexer and De-Multiplexer
DC and AC Electrical Characteristics
The following values indicate expected performance and are based on initial characterization
data. Unless otherwise specified in the tables below, all TA = 25 °C, VDD = 5.0 V.
5.0-V/3.3-V DC and AC Electrical Characteristics
Parameter
Typical
Min
Max
Units
67
MHz
Conditions and Notes
Input
Maximum Clock Rate
---
Component Changes
This section lists the major changes in the component from the previous version.
Version
Description of Changes
1.0.e
Minor datasheet update.
1.0.d
Minor datasheet update.
1.0.c
Minor datasheet edits and updates
1.0.b
Minor datasheet edits and updates
1.0.a
Updated datasheet to show examples of
firmware controlled components.
Reason for Changes / Impact
These were added to show how you can use and
implement these components with control registers.
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Cypress does not assume any liability arising out of the application or use of any product or circuit described herein. Cypress does not authorize its products for use as critical components in lifesupport systems where a malfunction or failure may reasonably be expected to result in significant injury to the user. The inclusion of Cypress’ product in a life-support systems application
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Document Number: 001-50455 Rev. *E
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