ST STM32G474 User Manual

RM0440 Rev 4 495/2126
RM0440 Filter math accelerator (FMAC)
513
y
n
= B.X
n
, where X
n
= [x
n-N
,...,x
n
] is composed of the N+1 elements of X at indexes n - N to
n.
This function corresponds to a finite impulse response (FIR) filter, where vector B
contains
the filter coefficients and vector X
the sampled data.
The structure of the filter (direct form) is shown in Figure 47.
Figure 47. FIR filter structure
Note that the cross correlation vector can be calculated by reversing the order of the
coefficient vector B
.
Input:
• X1 buffer contains the elements of vector X
. It is a circular buffer of length N + 1 + d.
• X2 buffer contains the elements of vector B
. It is a fixed buffer of length N + 1.
Output:
• Y buffer contains the output values, y
n
. It is a circular buffer of length d.
Z
-1
x[n]
b[1]
x[n-1]
b[2]
Z
-1
b[3]
x[n-2]
y[n]
Z
-1
b[0]
b[N]
Z
-1
x[n-3]
x[n-N]
2
R
MSv47126V1

ST STM32G474 Specifications

General

Series	STM32G4
Core Processor	ARM Cortex-M4
Core Size	32-bit
Max CPU Frequency	170 MHz
Flash Memory	512 KB
SRAM	128 KB
GPIO Pins	51
ADC Resolution	12-bit
DAC Resolution	12-bit
Operating Voltage	1.7V to 3.6V
Communication Interfaces	I2C, SPI, USART, USB
Operating Temperature	-40°C to 85°C
Package	LQFP64, LQFP48
Connectivity	USB, CAN
Peripherals	ADC, DAC
Oscillator Type	Internal, External