Medical Applications User Guide (pdf) - Freescale Semiconductor

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Diagnostic and Therapy Devices Power management and wireless communication blocks are explained in Chapter 3, Telehealth Systems. 10.6 Display Driver and Touch Screen Controller An LCD screen shows graphically the heart’s electrical signals and allows for a diagnosis of any cardiac anomalies or other problems. A touch screen offers developers an easy way to enhance their applications with touch-based user interfaces. Connecting screens to the MCF5227x is shown in Figure 10-12. For more information about these connections, see the MCF5227x reference manual and application notes about touch screens and LCD memory, available at freescale.com. 10.7 Enhanced Multiply- Accumulate (eMAC) Module A ColdFire or Kinetis MCU such as the MCF5227x, MCF51MM256 or MK53N512 can process the digital signals of the heartbeat, avoiding the need to use a separate DSP or DSC. The eMAC design provides a set of DSP operations that can improve the performance of embedded code while supporting the integer multiply instructions of the baseline ColdFire architecture. The ColdFire family supports two MAC implementations with different performance levels and capabilities. The original MAC features a three-stage execution pipeline optimized for 16-bit operands with a 16 x 16 multiply array and a single 32-bit accumulator. The eMAC features a four-stage pipeline optimized for 32-bit operands with a fully pipelined 32 × 32 multiply array and four 48-bit accumulators. Figure 9-11: 10-11: MCF522x MCF522x Family Family Block Block Diagram Diagram 12-bit color 16-bit color LCD Controller Figure 10-13: Typical DSP Chain Figure 9-13: Typical DSP Chain Analog Low-Pass Filter BDM PLL CCM GPIO JTAG USB OTG EPORT SSI 8 KB Cache Sample and Hold ADC 60 Medical Applications User Guide ASP Digital Filters SW/HW on ColdFire INTC I 2 C LCDC RTC DSPI 32-bit 4 DMA Timers EMAC 2-ch. 4 PWM ColdFire V2 Core XBS FlexCAN 2 PIT 3 UART DC/PWM DC/PWM 128 KB SRAM System Integration Debugging/Interface Peripherals Flash RAM Core Plus Feature Figure 9-12: 10-12: Screen Screen Connection Connection on MCF5227x on MCF5227x MPU Red bus Green bus Blue bus 6 6 6 Horizontal Sync Vertical Sync Pixel Clock Output Enable I2C/ADC Channel Touch Screen Controller RGB Screen with Touch Screen Analog Low-Pass Filter Analog Low-Pass Filter
The eMAC improvements target three primary areas: • Improved performance of 32 × 32 multiply operation • Addition of three more accumulators to minimize MAC pipeline stalls caused by exchanges between the accumulator and the pipeline’s general-purpose registers • A 48-bit accumulation data path to allow a 40-bit product plus eight extension bits to increase the dynamic number range when implementing signal processing algorithms The logic required to support this functionality is contained in a MAC module (Figure 10-14). Figure 10-15 is a typical implementation of digital signal processing using ColdFire. Freescale provides two documents describing DSP algorithms functionality: - ColdFire DSP Library Reference Manual Rev 0.4 - Digital Signal Processing Libraries Using the ColdFire eMAC and MAC - Fast-Fourier transform (FFT) - Finite impulse filter (FIR) - Infinite impulse filter (IIR) ColdFire MPUs such as the MCF5227x can perform digital signal processing using the enhanced multiply-accumulate module. This allows medical applications such as an electrocardiograph to perform heart signal filtering more efficiently. 10.8 USB Connection The USB connection allows the EGC to communicate with other devices such as hospital servers, remote monitoring systems and computers. This can be implemented using the USB On-the-Go module in the MCF5227x, or in the MK20, MK40, MK50 or MK60 family members. Shift 0,1,-1 Diagnostic and Therapy Devices Figure 9-14: 10-14: Multiply-Accumulate Functionality Functionality Diagram Diagram Operand Y Figure 9-15: 10-15: DSP DSP Library Library Structure Structure freescale .com/medical 61 X +/- Accumulator(s) eMAC Library Operand X FFT FIR IIR FFT 16 Bits FIR 16 Bits IIR 16 Bits MAC MAC MAC eMAC eMAC eMAC FFT 32 Bits FIR 32 Bits IIR 32 Bits MAC MAC MAC eMAC eMAC eMAC Figure 9-16: 10-16: Hardware Hardware Configuration Configuration in Host in Mode Host Mode MCU with USB module D- D+ Pull-down resistors Figure 9-17: 10-17: Hardware Configuration in Device in Device Mode Mode MCU with USB module Pull-up resistor D- D+ VDD VDD USB power VBUS D- D+ G VBUS D- D+ G
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Medical Applications User Guide TM
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freescale.com/medical 3 Introductio
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Introduction 1.1 Freescale Offers T
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Monebo Kenetic ECG Algorithms Free
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Page 103 and 104: Summary Summary Applications Freesc
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Medical Applications User Guide (pdf) - Freescale Semiconductor

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