CY8C58LP datasheet(46/122 Pages) CYPRESS

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PRELIMINARY

PSoC® 5LP: CY8C58LP Family

Datasheet

Document Number: 001-84932 Rev. **

Page 46 of 122

7.9 Digital Filter Block

Some devices in the CY8C58LP 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 7-19. 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.

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

■ High resolution Delta-Sigma ADC

■ 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

Digital Filter

Block

write_data

read_data

System

Bus

DMA

CTRL

Data

Source

(PHUB)

Data

Dest

(PHUB)

addr

Digital

Routing

BUSCLK

DMA

Request

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