Component - PrISM V2.20

®
PSoC Creator™ Component Datasheet
Precision Illumination Signal Modulation (PrISM)
2.20
Features
 Programmable flicker-free dimming resolution from 2 to 32 bit
 Two pulse density outputs
 Programmable output signal density
 Serial output bit stream
 Continuous run mode
 User-configurable sequence start value
 Standard or custom polynomials provided for all sequence lengths
 Kill input disables pulse density outputs and forces them low
 Enable input provides synchronized operation with other components
 Reset input allows restart at sequence start value for synchronization with other components
 Terminal Count Output for 8-, 16-, 24-, and 32-bit sequence lengths.
General Description
The Precision Illumination Signal Modulation (PrISM) component uses a linear feedback shift
register (LFSR) to generate a pseudo random sequence. The sequence outputs a pseudo
random bit stream, as well as up to two user-adjustable pseudo random pulse densities. The
pulse densities may range from 0 to 100 percent.
The LFSR is of the Galois form (sometimes known as the modular form) and uses the provided
maximal length codes. The PrISM component runs continuously after it starts and as long as the
enable input is held high. The PrISM pseudo random number generator can be started with any
valid seed value, excluding 0.
When to Use a PrISM
The PrISM component provides modulation technology that significantly reduces low-frequency
flicker and radiated electromagnetic interference (EMI), which are common problems with high-
Cypress Semiconductor Corporation • 198 Champion Court • San Jose, CA 95134-1709 • 408-943-2600
Document Number: 001-84994 Rev. *A
Revised February 20, 2013
Precision Illumination Signal Modulation (PrISM)
®
PSoC Creator™ Component Datasheet
brightness LED designs. The PrISM is also useful in other applications that need this benefit,
such as motor controls and power supplies.
Input/Output Connections
This section describes the various input and output connections for PrISM. 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.
clock – Input
The clock input defines the signal to compute the pseudo random sequence.
reset – Input
The reset input resets the pseudo random number to the start value at high state. This input is
valid for the started component only and provides synchronized operation with other
components.
kill – Input
The active-high kill input disables the PrISM pulse density outputs and sets them to 0 until kill is
released low.
enable – Input
The PrISM component runs after it starts and as long as the enable input is held high and reset
input is low. This input provides synchronized operation with other components.
pulse_den0/pulse_den1 – Outputs
Two pulse density outputs are available; both are derived from the same pseudo random
sequence. Each output is generated by comparing the desired pulse density value with the
current pseudo random number. If the pulse density type is configured as Less Than or Equal,
then the output is high while the pseudo random number is less than or equal to the pulse
density value. The second option is to set the pulse density type to Greater Than or Equal so
the output is high while the pseudo random number is greater than or equal to the pulse density
value.
bitstream – Output
The bitstream output continuously outputs the LSb of the LFSR.
Page 2 of 18
Document Number: 001-84994 Rev. *A
®
PSoC Creator™ Component Datasheet
Precision Illumination Signal Modulation (PrISM)
tc – Output *
The terminal count output is available for 8-, 16-, 24-, and 32-bit length PrISM components. The
terminal count output goes high for one clock period each time the pseudo random number
equals 0xFF (8-bit), 0xFFFF (16-bit), 0xFFFFFF (24-bit), or 0xFFFFFFFF (32-bit), which occurs
once during each cycle of the pseudo random number generator.
Component Parameters
Drag a PrISM component onto your design and double-click it to open the Configure dialog box.
Figure 1. Configure Dialog Box
The PrISM component contains the following parameters:
Resolution
This parameter defines the PrISM maximal code length (period). The maximal code length is
(2Resolution – 1). Possible values include 2 to 32 bits. The maximal length code sets the length of
the pseudo random number generator and, therefore, the length of the sequence to be
generated. Longer sequences increase the pulse density resolution and lower the radiated EMI.
The maximal length codes listed in the following table are provided in the Galois form and
require no conversion before you use them in the PSoC 3 UDB ALU.
Document Number: 001-84994 Rev. *A
Page 3 of 18
®
Precision Illumination Signal Modulation (PrISM)
PSoC Creator™ Component Datasheet
Table 1. Maximal Code Lengths
Resolution
LFSR
Resolution
LFSR
Resolution
LFSR
2
2, 1
13
13, 12, 10, 9
24
24, 23, 21, 20
3
3, 2
14
14, 13, 11, 9
25
25, 24, 23, 22
4
4, 3
15
15, 14, 13, 11
26
26, 25, 24, 20
5
5, 4, 3, 2
16
16, 14, 13, 11
27
27, 26, 25, 22
6
6, 5, 3, 2
17
17, 16, 15, 14
28
28, 27, 24, 22
7
7, 6, 5, 4
18
18, 17, 16, 13
29
29, 28, 27, 25
8
8, 6, 5, 4
19
19, 18, 17, 14
30
30, 29, 26, 24
9
9, 8, 6, 5
20
20, 19, 16, 14
31
31, 30, 29, 28
10
10, 9, 7, 6
21
21, 20, 19, 16
32
32, 30, 26, 25
11
11, 10, 9, 7
22
22, 19, 18, 17
12
12, 11, 8, 6
23
23, 22, 20, 18
To Set LFSR Coefficients Manually:
Define Resolution.
Select the Custom check box.
Enter coefficients separated by comma in the LFSR text box and press [Enter]. The Polynomial
Value is recalculated automatically.
The Polynomial Value is represented in hexadecimal format.
Note LFSR coefficient value cannot be greater than the Resolution value.
Polynomial Value
This parameter is represented in hexadecimal format. The correct polynomial is chosen based
on the Resolution selected. A custom polynomial can be specified.
Seed Value
This parameter, by default, is set to the maximum possible value (2Resolution – 1). This value can
be changed to any value except 0. The Seed value is represented in the hexadecimal form.
Note Changing the Resolution sets the Seed value to the default value.
Page 4 of 18
Document Number: 001-84994 Rev. *A
®
PSoC Creator™ Component Datasheet
Precision Illumination Signal Modulation (PrISM)
Pulse Mode
These parameter values are chosen from combo boxes. Available values are from 1 to
2Resolution – 1 with a step 2Resolution. Pulse compare type can be set to Less Than or Equal or
Greater Than or Equal.
PulseType Hardcoded
The PulseType Hardcoded parameter saves resources (control register) when enabled, but
makes it impossible to change the Pulse Type using the PrISM_SetPulse0Mode() or
PrISM_SetPulse1Mode() APIs.
The PrISM_Stop() function is also not available if this parameter is enabled. To stop the PrISM in
this case, use the “enable” input.
Local Parameters (For API usage)
These parameters are used in the API and not shown in the Configure dialog.

PolyValue(uint32) – Contains the polynomial value in hexadecimal format. The default is
0xB8h (LFSR= [8,6,5,4]).



Density0(uint32) – Contains density0 value in hexadecimal format.

Density1(uint32) – Contains density1 value in hexadecimal format.
CompareType0(CompareType) – Contains Pulse Type for Density0, which may be Less
Than or Equal or Greater Than or Equal.
CompareType1(CompareType) – Contains Pulse Type for Density1, which may be Less
Than or Equal or Greater Than or Equal.
Clock Selection
There is no internal clock in this component. You must attach a clock source. This component
operates from a single clock connected to the component.
Application Programming Interface
Application Programming Interface (API) routines allow configuration of the component using
software. The following table lists and describes the interface to each function. The subsequent
sections cover each function in more detail.
By default, PSoC Creator assigns the instance name “PrISM_1” to the first instance of a
component in a given design. You can rename the instance to any unique value that follows the
syntactic rules for identifiers. The instance name becomes the prefix of every global function
Document Number: 001-84994 Rev. *A
Page 5 of 18
®
Precision Illumination Signal Modulation (PrISM)
PSoC Creator™ Component Datasheet
name, variable, and constant symbol. For readability, the instance name used in the following
table is “PrISM.”
Table2. Function Interfaces
Function
Description
PrISM_Start()
The start function sets polynomial, seed, and pulse density
registers provided by the customizer.
PrISM_Stop()
Stops PrISM computation.
PrISM_SetPulse0Mode()
Sets the pulse density type for Density0.
PrISM_SetPulse1Mode()
Sets the pulse density type for Density1.
PrISM_ReadSeed()
Reads the PrISM Seed register.
PrISM_WriteSeed()
Writes the PrISM Seed register with the start value.
PrISM_ReadPolynomial()
Reads the PrISM Polynomial register.
PrISM_WritePolynomial()
Writes the PrISM Polynomial register with the start value.
PrISM_ReadPulse0()
Reads the PrISM Pulse Density0 value register.
PrISM_WritePulse0()
Writes the PrISM Pulse Density0 value register with the
new Pulse Density value.
PrISM_ReadPulse1()
Reads the PrISM Pulse Density1 value register.
PrISM_WritePulse1()
Writes the PrISM Pulse Density1 value register with the
new Pulse Density value.
PrISM_Sleep()
Stops and saves the user configuration.
PrISM_Wakeup()
Restores and enables the user configuration
PrISM_Init()
Initializes the default configuration provided with the
customizer.
PrISM_Enable()
Enables the PrISM block operation.
PrISM_SaveConfig()
Saves the current user configuration.
PrISM_RestoreConfig()
Restores the current user configuration.
Table3. Global Variables
Variable
PrISM_initVar
Description
Indicates whether the PrISM has been initialized. The variable is initialized to 0 and set to 1 the
first time PrISM_Start() is called. This allows the component to restart without reinitialization
after the first call to the PrISM_Start() routine.
If reinitialization of the component is required, then the PrISM_Init() function can be called
before the PrISM_Start() or PrISM_Enable() functions.
Page 6 of 18
Document Number: 001-84994 Rev. *A
®
PSoC Creator™ Component Datasheet
Precision Illumination Signal Modulation (PrISM)
void PrISM_Start(void)
Description:
This is the preferred method to begin component operation. PrISM_Start() sets the initVar
variable, calls the PrISM_Init() function, and then calls the PrISM_Enable() function. The
start function sets polynomial, seed, and pulse density registers provided by the
customizer. PrISM computation starts on the rising edge of the input clock.
Parameters:
None
Return Value:
None
Side Effects:
None
void PrISM_Stop(void)
Description:
Stops PrISM computation. Outputs remain constant.
Parameters:
None
Return Value:
None
Side Effects:
Valid only if the PulseType Hardcoded parameter is disabled.
void PrISM_SetPulse0Mode(uint8 pulse0Type)
Description:
Sets the pulse density type for Density0. Less Than or Equal(<=) or Greater Than or
Equal(>=).
Parameters:
uint8 pulse0Type: Selected pulse density type
Parameters Value
PrISM_LESSTHAN_OR_EQUAL
Description
The pulse_den0 output is high when the pseudo
random number is less than or equal to the
PulseDensity0 register value
PrISM_GREATERTHAN_OR_EQUAL The pulse_den0 output is high when the pseudo
random number is greater than or equal to the
PulseDensity0 register value
Return Value:
None
Side Effects:
Valid only if the PulseType Hardcoded parameter is disabled.
Document Number: 001-84994 Rev. *A
Page 7 of 18
®
Precision Illumination Signal Modulation (PrISM)
PSoC Creator™ Component Datasheet
void PrISM_SetPulse1Mode(uint8 pulse1Type)
Description:
Sets the pulse density type for Density1. Less Than or Equal(<=) or Greater Than or
Equal(>=).
Parameters:
uint8 pulse1Type: Selected pulse density type
Parameters Value
PrISM_LESSTHAN_OR_EQUAL
Description
The pulse_den1 output is high when the pseudo
random number is less than or equal to the
PulseDensity1 register value
PrISM_GREATERTHAN_OR_EQUAL The pulse_den1 output is high when the pseudo
random number is greater than or equal to the
PulseDensity1 register value
Return Value:
None
Side Effects:
Valid only if the PulseType Hardcoded parameter is disabled.
uint8/16/32 PrISM_ReadSeed(void)
Description:
Reads the PrISM seed register.
Parameters:
None
Return Value:
uint8/16/32: Seed register value
Side Effects:
None
void PrISM_WriteSeed(uint8/16/32 seed)
Description:
Writes the PrISM seed register with the start value.
Parameters:
uint8/16/32) seed: Seed register value
Return Value:
None
Side Effects:
None
uint8/16/32 PrISM_ReadPolynomial(void)
Description:
Reads the PrISM polynomial.
Parameters:
None
Return Value:
uint8/16/32: Value of the polynomial
Side Effects:
None
Page 8 of 18
Document Number: 001-84994 Rev. *A
®
PSoC Creator™ Component Datasheet
Precision Illumination Signal Modulation (PrISM)
void PrISM_WritePolynomial(uint8/16/32 polynomial)
Description:
Writes the PrISM polynomial.
Parameters:
uint8/16/32 polynomial: Polynomial register value
Return Value:
None
Side Effects:
None
uint8/16/32 PrISM_ReadPulse0(void)
Description:
Reads the PrISM PulseDensity0 value register.
Parameters:
None
Return Value:
uint8/16/32: PulseDensity0 register value
Side Effects:
None
void PrISM_WritePulse0(uint8/16/32 pulseDensity0)
Description:
Writes the PrISM Pulse Density0 value register with the new Pulse Density value.
Parameters:
(unit8/16/32) pulseDensity0: Pulse Density value.
Return Value:
None
Side Effects:
None
uint8/16/32 PrISM_ReadPulse1(void)
Description:
Reads the PrISM Pulse Density1 value register.
Parameters:
None
Return Value:
uint8/16/32: Pulse Density1 register value
Side Effects:
None
void PrISM_WritePulse1(uint8/16/32 pulseDensity1)
Description:
Writes the PrISM Pulse Density1 value register with the new Pulse Density value.
Parameters:
uint8/16/32 pulseDensity1: Pulse Density value
Return Value:
None
Side Effects:
None
Document Number: 001-84994 Rev. *A
Page 9 of 18
Precision Illumination Signal Modulation (PrISM)
®
PSoC Creator™ Component Datasheet
void PrISM_Sleep(void)
Description:
This is the preferred API to prepare the component for sleep. The PrISM_Sleep() API saves
the current component state. Then it calls the PrISM_Stop() function and calls
PrISM_SaveConfig() to save the hardware configuration.
Call the PrISM_Sleep() function before calling the CyPmSleep() or the CyPmHibernate()
function. Refer to the PSoC Creator System Reference Guide for more information about
power-management functions.
Parameters:
None
Return Value:
None
Side Effects:
None
void PrISM_Wakeup(void)
Description:
This is the preferred API to restore the component to the state when PrISM_Sleep() was
called. The PrISM_Wakeup() function calls the PrISM_RestoreConfig() function to restore
the configuration. If the component was enabled before the PrISM_Sleep() function was
called, the PrISM_Wakeup() function also re-enables the component.
Parameters:
None
Return Value:
None
Side Effects:
Calling the PrISM_Wakeup() function without first calling the PrISM_Sleep() or
PrISM_SaveConfig() function may produce unexpected behavior.
void PrISM_Init(void)
Description:
Initializes or restores the component according to the customizer Configure dialog settings.
It is not necessary to call PrISM_Init() because the PrISM_Start() API calls this function and
is the preferred method to begin the component operation.
Parameters:
None
Return Value:
None
Side Effects:
All registers are set to values according to the customizer Configure dialog.
void PrISM_Enable(void)
Description:
Activates the hardware and begins component operation. It is not necessary to call
PrISM_Enable() because the PrISM_Start() API calls this function, which is the preferred
method to begin the component operation.
Parameters:
None
Return Value:
None
Side Effects:
None
Page 10 of 18
Document Number: 001-84994 Rev. *A
®
PSoC Creator™ Component Datasheet
Precision Illumination Signal Modulation (PrISM)
void PrISM_SaveConfig(void)
Description:
This function saves the component configuration and nonretention registers. It also saves
the current component parameter values, as defined in the Configure dialog or as modified
by appropriate APIs. This function is called by the PrISM_Sleep() function.
Parameters:
None
Return Value:
None
Side Effects:
None
void PrISM_RestoreConfig(void)
Description:
This function restores the component configuration and nonretention registers. It also
restores the component parameter values to what they were before calling the
PrISM_Sleep() function.
Parameters:
None
Return Value:
None
Side Effects:
Calling this function without first calling the PrISM_Sleep() or PrISM_SaveConfig() function
may produce unexpected behavior.
MISRA Compliance
This section describes the MISRA-C:2004 compliance and deviations for the component. There
are two types of deviations defined: project deviations – deviations that are applicable for all
PSoC Creator components and specific deviations – deviations that are applicable only for this
component. This section provides information on component specific deviations. The project
deviations are described in the MISRA Compliance section of the System Reference Guide
along with information on the MISRA compliance verification environment.
The PrISM component does not have any specific deviations.
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.
Document Number: 001-84994 Rev. *A
Page 11 of 18
Precision Illumination Signal Modulation (PrISM)
®
PSoC Creator™ Component Datasheet
Functional Description
The PrISM component runs continuously after starting and as long as the “enable” input is kept
high. The PrISM pseudo random number generator may be started with any valid value
excluding 0. This allows multiple PrISM components to run out of phase of each other to further
reduce EMI. The “reset” input resets the pseudo random number to the start value. The activehigh “kill” input disables the PrISM pulse density outputs and sets them to 0 until kill is released
low. The “bitstream” output continuously outputs the LSb of the LFSR.
Two Pulse Density outputs are available; both are derived from the same pseudo random
sequence. Each output is generated by comparing the desired pulse density value with the
current pseudo random number.
The following timing diagram shows the PrISM output based on several pulse density ratios.
Figure 2. Timing of PrISM Output
Page 12 of 18
Document Number: 001-84994 Rev. *A
®
PSoC Creator™ Component Datasheet
Precision Illumination Signal Modulation (PrISM)
Block Diagram and Configuration
The PrISM is only available as a UDB configuration. The API is described above and the
registers are described here to define the overall implementation of the PrISM.
The implementation is described in the following block diagram.
Figure 3. PrISM Implementation
Top-Level Architecture
The 2- to 32-bit hardware PrISM component compares the output of a pseudo random counter
with a signal density value. The comparator output asserts when the count value is less than (or
greater than) or equal to the value in the Density value register.
Figure 4. PrISM Top-Level Architecture
kill
&
Density0
PRS
Cmp
<=
>=
bitstream
enable
reset
clock
Document Number: 001-84994 Rev. *A
Density1
Cmp
<=
>=
pulse_den0
&
pulse_den1
tc
Page 13 of 18
®
Precision Illumination Signal Modulation (PrISM)
PSoC Creator™ Component Datasheet
Registers
PrISM_CONTROL
Bits
7
6
Value
5
4
3
reserved
2
1
0
compare
type1
compare
type0
ctrl enable

ctrl enable: This bit enables generation of all internal signals described in the previous
sections. The value can be changed by the PrISM_Start() and PrISM_Stop() functions.

compare type0: This bit performs compare type for the pulse_den0 output. The value of this
bit is determined by the choice made for the pulse compare type parameter in the component
Configure dialog. Also, the value can be changed by the PrISM_SetPulse0Mode() function.

compare type1: This bit performs compare type for pulse_den1 output. The value of this bit is
determined by the choice made for the pulse compare type parameter in the component
Configure dialog. Also, the value can be changed by the PrISM_SetPulse1Mode() function.
The control register is not used if the PulseType Hardcoded option is selected.
PrISM_SEED
Bits
7
6
5
4
3
Value

2
1
0
Seed
Seed: Contains the initial Seed value and PRS residual value at the end of the computation.
The value of this register is determined by the Seed value parameter in the component
Configure dialog. Also, the value can be changed by the PrISM_WriteSeed() function and can
be read by PrISM_ReadSeed().
PrISM_SEED_COPY
Bits
Value

7
6
5
4
3
2
1
0
Seed_Copy
Seed_Copy: Contains the start Seed value for automatically loading PrISM_SEED register
when the “reset” input is active. The value of this register is determined by the Seed value
parameter in the component Configure dialog and automatically updates if the
PrISM_WriteSeed() function is called.
Page 14 of 18
Document Number: 001-84994 Rev. *A
®
PSoC Creator™ Component Datasheet
Precision Illumination Signal Modulation (PrISM)
PrISM_POLYNOM
Bits
7
6
5
4
Value

3
2
1
0
Polynomial
Polynomial: The correct polynomial chosen based on the resolution selected. The value can
be changed by the PrISM_WritePolynomial() function and can be read by the
PrISM_ReadPolynomial() function.
PrISM_DENSITY0
Bits
7
6
5
Value

4
3
2
1
0
Pulse density0
Pulse density0 determines the value for the PrISM pulse_den0 output. The value of this
register is determined by the PulseDensity0 parameter in the Configure dialog. This value
can be changed by the PrISM_WritePulse0() function.
PrISM_DENSITY1
Bits
7
6
5
Value

4
3
2
1
0
Pulse density1
Pulse density1 determines the value for the PrISM pulse_den1 output. The value of this
register is determined by the PulseDensity1 parameter in the Configure dialog. This value
can be changed by the PrISM_WritePulse1() function.
References
Refer also to the PRS component datasheet.
Resources
The PrISM component is placed throughout the UDB array. The component utilizes the following
resources.
Document Number: 001-84994 Rev. *A
Page 15 of 18
®
Precision Illumination Signal Modulation (PrISM)
PSoC Creator™ Component Datasheet
Table 4. Resource Types
Resource Type
Configuration
Datapath
Cells
Macrocel
ls
Status
Cells
Control
[1]
Cells
DMA
Channels
Interrupts
8-bit
1
4
–
1
–
–
16-bit
2
4
–
1
–
–
24-bit
3
4
–
1
–
–
32-bit
4
4
–
1
–
–
API Memory Usage
The component memory usage varies significantly, depending on the compiler, device, number
of APIs used and component configuration. The following table provides the memory usage for
all APIs available in the given component configuration.
The measurements have been done with the associated compiler configured in Release mode
with optimization set for Size. For a specific design, the map file generated by the compiler can
be analyzed to determine the memory usage.
Table 5. API Memory Resource Usage
PSoC 3 (Keil_PK51)
Configuration
PSoC 4 (GCC)
PSoC 5LP (GCC)
Flash
SRAM
Flash
SRAM
Flash
SRAM
Bytes
Bytes
Bytes
Bytes
Bytes
Bytes
8-bit
281
6
440
9
428
9
16-bit
428
9
456
9
444
9
24-bit
419
15
520
17
512
17
32-bit
421
15
456
17
432
17
DC and AC Electrical Characteristics
Specifications are valid for –40 °C £ TA £ 85 °C and TJ £ 100 °C, except where noted.
Specifications are valid for 1.71 V to 5.5 V, except where noted.
1. Control cells are not used if the PulseType Hardcoded parameter is checked.
Page 16 of 18
Document Number: 001-84994 Rev. *A
®
PSoC Creator™ Component Datasheet
Precision Illumination Signal Modulation (PrISM)
Table 6. DC Characteristics
Parameter
IDD
Description
Min
Typ
[2]
Max
Units
Component current consumption
8-bit
–
15
–
µA/MHz
16-bit
–
22
–
µA/MHz
24-bit
–
28
–
µA/MHz
32-bit
–
35
–
µA/MHz
Min
Typ
Table 7. AC Characteristics
Parameter
fCLOCK
Description
Max
[3]
Units
Component clock frequency
8-bit
66
MHz
16-bit
55
MHz
24-bit
48
MHz
32-bit
40
MHz
2. Device IO and clock distribution current not included. The values are at 25 °C.
3. The values provide a maximum safe operating frequency of the component. The component may run at higher clock
frequencies, at which point validation of the timing requirements with STA results is necessary.
Document Number: 001-84994 Rev. *A
Page 17 of 18
Precision Illumination Signal Modulation (PrISM)
PSoC® Creator™ Component Datasheet
Component Changes
This section lists the major changes in the component from the previous version.
Version
Description of Changes
Reason for Changes / Impact
2.20.a
Updated datasheet with memory usage
for PSoC 4.
2.20
Added MISRA Compliance section.
The component does not have any specific deviations.
2.10
Added all APIs with the CYREENTRANT
keyword when they are included in the
.cyre file.
Not all APIs are truly reentrant. Comments in the
component API source files indicate which functions are
candidates.
This change is required to eliminate compiler warnings for
functions that are not reentrant used in a safe way:
protected from concurrent calls by flags or Critical Sections.
Added support PSoC 5LP silicon.
2.0.a
Minor datasheet edits and updates
2.0
Pulse Density outputs registered for
removing possible glitching.
Any combinatorial output can glitch, depending on
placement and delay between signals. To remove glitching,
the outputs should be registered.
Enable and reset inputs registered to
improve maximum speed operation.
These inputs had combinatorial usage, therefore were not
automatically registered by Creator and had violations.
Registering improves maximum speed and protects from
possible glitching.
Added characterization data to datasheet
Minor datasheet edits and updates
© Cypress Semiconductor Corporation, 2013. 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® is a registered trademark, and PSoC Creator™ and Programmable System-on-Chip™ are trademarks 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 18 of 18
Document Number: 001-84994 Rev. *A
Similar pages