CY8C5468AXI-018 Cypress Semiconductor Corp, CY8C5468AXI-018 Datasheet - Page 44

• Manufacturer Part Number: CY8C5468AXI-018
• Manufacturer: Cypress Semiconductor Corp

Specifications of CY8C5468AXI-018

• Lead Free Status / Rohs Status: Compliant

7.9 Digital Filter Block
Some devices in the CY8C54 family of devices have a dedicated
HW accelerator block used for digital filtering. The DFB has a
dedicated multiplier and accumulator that calculates a 24-bit by
24-bit multiply accumulate in one system clock cycle. This
enables the mapping of a direct form FIR filter that approaches
a computation rate of one FIR tap for each clock cycle. The MCU
can implement any of the functions performed by this block, but
at a slower rate that consumes significant MCU bandwidth.
The PSoC Creator interface provides a wizard to implement FIR
and IIR digital filters with coefficients for LPF, BPF, HPF, Notch
and arbitrary shape filters. 64 pairs of data and coefficients are
stored. This enables a 64 tap FIR filter or up to 4 16 tap filters of
either FIR or IIR formulation.
Figure 7-23. DFB Application Diagram (pwr/gnd not shown)
The typical use model is for data to be supplied to the DFB over
the system bus from another on-chip system data source such
as an ADC. The data typically passes through main memory or
is directly transferred from another chip resource through DMA.
Document Number: 001-66238 Rev. *A
Routing
BUSCLK
Digital
Digital Filter
Block
read_data
write_data
Request
DMA
addr
System
CTRL
DMA
Bus
PRELIMINARY
(PHUB)
Source
(PHUB)
Data
Data
Dest
The DFB processes this data and passes the result to another
on chip resource such as a DAC or main memory through DMA
on the system bus.
Data movement in or out of the DFB is typically controlled by the
system DMA controller but can be moved directly by the MCU.
8. Analog Subsystem
The analog programmable system creates application specific
combinations of both standard and advanced analog signal
processing blocks. These blocks are then interconnected to
each other and also to any pin on the device, providing a high
level of design flexibility and IP security. The features of the
analog subsystem are outlined here to provide an overview of
capabilities and architecture.
Flexible, configurable analog routing architecture provided by
analog globals, analog mux bus, and analog local buses
Two successive approximation (SAR) ADCs
Four 8-bit DACs that provide either voltage or current output
Four comparators with optional connection to configurable LUT
outputs
Four configurable switched capacitor/continuos time (SC/CT)
blocks for functions that include opamp, unity gain buffer,
programmable gain amplifier, transimpedance amplifier, and
mixer
Four opamps for internal use and connection to GPIO that can
be used as high current output buffers
CapSense subsystem to enable capacitive touch sensing
Precision reference for generating an accurate analog voltage
for internal analog blocks
PSoC
®
5: CY8C54 Family Datasheet
Page 44 of 105
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