DSP56800 Hardware Interface TechniquesFreescaleSemiconductor Application NoteOrder by AN1920/DFreescale Order NumberRev. 0, 06/2001© Motorola, Inc., 2
10 DSP56800 Hardware Interface Techniques System FunctionsThis section is dedicated to testing and debugging retention, but specifically through the
Memory Interfaces DSP56800 Hardware Interface Techniques 11This section includes aspects of the JTAG implementation specific to the DSP56F801 through
12 DSP56800 Hardware Interface Techniques Memory InterfacesIf EXTBOOT is asserted low during reset, then Mode 0A: boot is automatically entered when
Memory Interfaces DSP56800 Hardware Interface Techniques 13The MODA and MODB pins are sampled as the DSP56824 leaves the Reset state, and the initial
14 DSP56800 Hardware Interface Techniques Memory Interfaces3.1.7 Normal Expanded Mode (Mode 2) In the Normal Expanded mode (Mode 2), all 32,768 word
Memory Interfaces DSP56800 Hardware Interface Techniques 15Then: Top = 1/50e6 = 20nsWS = 0 tACC = Top*0 + (Top – 11.5) = 8.5nsMany SRAM devices
16 DSP56800 Hardware Interface Techniques Memory Interfaces3.2.3.1 Memory Paging Using GPIOFigure 14 below shows a simple technique to select diffe
Memory Interfaces DSP56800 Hardware Interface Techniques 17Initialize GPIO control registersFor a page transition:i) Set GPIO to zeroii) Execute exte
18 DSP56800 Hardware Interface Techniques Peripheral Interfaces4. Peripheral InterfacesThe following sections provide example interfaces to DSP5680
Peripheral Interfaces DSP56800 Hardware Interface Techniques 19Figure 17. CAN Interface4.3 Codec Interface (DSP56824)The DSP56824EVM provides a 13-
2 DSP56800 Hardware Interface Techniques System FunctionsFigure 1. Schematic Diagram of the Power SupplyThe DSP56800 devices include both analog and
20 DSP56800 Hardware Interface Techniques Peripheral InterfacesFigure 18. Block Diagram of the SSI CODEC Interface 3.4 DAC Interface using SPI PortTh
Peripheral Interfaces DSP56800 Hardware Interface Techniques 21Figure 19. Serial 10-bit, 4-Channel D/A Converter4.4 PWM InterfaceThe sections below
22 DSP56800 Hardware Interface Techniques Peripheral Interfaces4.5 Motor Protection LogicThe DSP56F807EVM contains two UNI-3 connectors that interf
Peripheral Interfaces DSP56800 Hardware Interface Techniques 23Figure 22. DC-Bus Over-Voltage and Phase Over-Current Detection CircuitsTable 6: FAULT
24 DSP56800 Hardware Interface Techniques Peripheral Interfaces4.6 SCI InterfaceAn example of an SCI interface is that provided by the DSP56F807EVM
Conclusion DSP56800 Hardware Interface Techniques 254.7 Quadrature Decoder InterfaceThe DSP56F807EVM board contains a Primary and Secondary Quadrat
26 DSP56800 Hardware Interface Techniques References6. References1. Howard W. Johnson and Martin Graham, “High-Speed Digital Design”, PTR Prentice-
NOTES: DSP56800 Hardware Interface Techniques 27 NOTES: ___________________________________________________________________________________________
AN1920/D Freescale Semiconductor, I Freescale Semiconductor, Inc.For More Information On This Produ
System Functions DSP56800 Hardware Interface Techniques 39. Consider all device loads as well as parasitic capacitance due to PCB traces when calcula
4 DSP56800 Hardware Interface Techniques System Functions2.2.2 External Clock SourceThe recommended method of connecting an external clock is given
System Functions DSP56800 Hardware Interface Techniques 5where C depends on die area and output capacitive loading as described below, VDD is the dig
6 DSP56800 Hardware Interface Techniques System FunctionsFigure 6. IDDA vs. VDDA2.3.4 Variation with Respect to Operating FrequencyThe digital suppl
System Functions DSP56800 Hardware Interface Techniques 72.3.5 Variation with Respect to Output Loading Output loading influences supply current req
8 DSP56800 Hardware Interface Techniques System FunctionsBy default, the pulse shaper functions force internal reset signals to be a minimum of 32 os
System Functions DSP56800 Hardware Interface Techniques 92.4.3 GPIO Pin Configured as Interrupt InterfaceAn example interface to GPIO pins found on
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