Component - Digital Multiplexer and De-Multiplexer V1.10 Datasheet.pdf

®
PSoC Creator™ Component Datasheet
Digital Multiplexer and Demultiplexer
1.10
Features
 Digital Multiplexer
 Digital Demultiplexer
 Up to 16 channels
General Description
The Multiplexer component is used to select 1 of n inputs while the Demultiplexer 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 Demultiplexer 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 Demultiplexer 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 is routed to the output based on the select input. The
number of inputs depends on the size of the multiplexer.
Cypress Semiconductor Corporation • 198 Champion Court • San Jose, CA 95134-1709 • 408-943-2600
Document Number: 001-73370 Rev. *A
Revised May 15, 2012
Digital Multiplexer and Demultiplexer
®
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 Demultiplexer. The
width of the select input depends on the number of inputs and outputs.
Demultiplexer
0 – Input
Input to the Demultiplexer that is routed to one of n outputs.
Outputs 0-n
Outputs from the Demultiplexer, only one of which is driven based on the select input. The
number of outputs depends on the size of the demultiplexer. 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 Demultiplexer. The
width of the select input depends on the number of inputs and outputs.
Page 2 of 6
Document Number: 001-73370 Rev. *A
®
PSoC Creator™ Component Datasheet
Digital Multiplexer and Demultiplexer
Component Parameters
Drag a Multiplexer or Demultiplexer onto your design and double-click it to open the Configure
dialog.
Multiplexer
Figure 1. Configure Multiplexer Dialog
The Multiplexer provides the following parameters.
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.
TerminalWidth
You can create an array of parallel Multiplexers, which may be useful when the inputs are buses.
This parameter defines the bus width of the inputs. The default is 1. The range of valid values is
1 to 32, inclusive. This parameter does not affect the width of the select input.
Document Number: 001-73370 Rev. *A
Page 3 of 6
Digital Multiplexer and Demultiplexer
®
PSoC Creator™ Component Datasheet
Demultiplexer
Figure 2. Configure Demultiplexer Dialog
The Demultiplexer provides the following parameters.
NumOutputTerminals
This parameter determines the number of Demultiplexer 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 Demultiplexers, which may be useful when the outputs are
buses. This parameter defines the bus width of the outputs. The default is 1. The range of valid
values is 1 to 32, inclusive. This parameter does not affect the width of the select input.
Sample Firmware Source Code
PSoC Creator provides many 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.
Page 4 of 6
Document Number: 001-73370 Rev. *A
®
PSoC Creator™ Component Datasheet
Digital Multiplexer and Demultiplexer
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
Demultiplexer
The Demultiplexer 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 Demultiplexer 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: 001-73370 Rev. *A
Page 5 of 6
Digital Multiplexer and Demultiplexer
®
PSoC Creator™ Component Datasheet
Resources
The Multiplexer and Demultiplexer are implemented with logic equations and therefore are
synthesized and mapped into PLD blocks within the UDB array. The component size and width
determines the size of the logic equations and thus the number of PLDs used.
Component Changes
This section lists the major changes in the component from the previous version.
Version
Description of Changes
1.10.a
Minor datasheet edits and updates.
1.10
Symbol updates to differentiate the multiplexer
from demultiplexer when the symbols are
flipped.
Reason for Changes / Impact
Multiplexer and Demultiplexer looks same when
symbols are flipped.
Minor datasheet edits to separate out the
descriptions of multiplexer and demultiplexer
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.
These were added to show how you can use and
implement these components with control registers.
© Cypress Semiconductor Corporation, 2012. The information contained herein is subject to change without notice. Cypress Semiconductor Corporation assumes no responsibility for the use of
any circuitry other than circuitry embodied in a Cypress product. Nor does it convey or imply any license under patent or other rights. Cypress products are not warranted nor intended to be used
for medical, life support, life saving, critical control or safety applications, unless pursuant to an express written agreement with Cypress. Furthermore, Cypress does not authorize its products for
use as critical components in life-support systems where a malfunction or failure may reasonably be expected to result in significant injury to the user. The inclusion of Cypress products in lifesupport systems application implies that the manufacturer assumes all risk of such use and in doing so indemnifies Cypress against all charges.
PSoC® Creator™, Programmable System-on-Chip™, and PSoC Express™ are trademarks and PSoC® is a registered trademark of Cypress Semiconductor Corp. All other trademarks or
registered trademarks referenced herein are property of the respective corporations.
Any Source Code (software and/or firmware) is owned by Cypress Semiconductor Corporation (Cypress) and is protected by and subject to worldwide patent protection (United States and
foreign), United States copyright laws and international treaty provisions. Cypress hereby grants to licensee a personal, non-exclusive, non-transferable license to copy, use, modify, create
derivative works of, and compile the Cypress Source Code and derivative works for the sole purpose of creating custom software and or firmware in support of licensee product to be used only in
conjunction with a Cypress integrated circuit as specified in the applicable agreement. Any reproduction, modification, translation, compilation, or representation of this Source Code except as
specified above is prohibited without the express written permission of Cypress.
Disclaimer: CYPRESS MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARD TO THIS MATERIAL, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. Cypress reserves the right to make changes without further notice to the materials described herein.
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
implies that the manufacturer assumes all risk of such use and in doing so indemnifies Cypress against all charges.
Use may be limited by and subject to the applicable Cypress software license agreement.
Page 6 of 6
Document Number: 001-73370 Rev. *A
Similar pages