Rabbit 2000™ Microprocessor - UTN

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3.4.2.5 Elimination of Power PlaneIf the power plane is eliminated or extensively slotted to accommodate routed traces, decouplingand power distribution becomes more critical. The key is to maintain a low inductance connectionfrom “hot” package power pins to a decoupling capacitor. Also, keep the inductance betweenwidely separated parts of the power net as low as possible. Gridding the net in a cross connect patternwill lower inductance between points, as will wider traces. The procedure is to use a grid andthen use wide traces from grid intersections to the decoupling capacitors or packages.WideTraceDecouplingCapacitorV DDto V SS(GND)Figure 8. Power Distribution Grid18 Rabbit 2000 Microprocessor
4. How Dynamic C Cold Boots theTarget SystemDynamic C assumes that target controller boards using the Rabbit CPU have no pre-installed firmware.It takes advantage of the Rabbit’s bootstrap (cold boot) mode that allows memory and I/Owrites to take place over the programming port.Circuit Board with Rabbit 2000 Processor1 23 45 67 8109ProgrammingHeader PinoutProgrammingHeaderRXAGNDCLKAVcc/RESETTXAn.c.STATUSSMODE0SMODE112345678910Vcc~50 kW~50 kW~50 kW~50 kW ~5 kW51GND94+5 V3754383635RABBIT 2000RXAVSSCLKAVDD/RESETTXASTATUSSMODE0SMODE1Figure 9. Rabbit Programming PortThe Rabbit programming cable is a smart cable with an active circuit board in its middle. The circuitboard converts RS-232 voltage levels used by the PC serial port to CMOS voltage levels usedby the Rabbit.When the programming cable connects a PC serial port to the target controller board, the PC runningDynamic C is connected to the Rabbit as shown in Table 1.Table 2. Programming Port ConnectionsPC Serial Port SignalDTR (output)DSR (input)Rabbit Signal/RESET (input, reset system)STATUS (gen purpose output)TX (serial output) RXA (serial input, chan A)RX (serial input) TXA (serial output, chan A)Designer’s Handbook 19
Page 1 and 2: Rabbit 2000 MicroprocessorDesigner
Page 3 and 4: Table of Contents1 Introduction ...
Page 5 and 6: Instructions Affected by the Wait S
Page 7 and 8: 1. IntroductionThis manual is inten
Page 9 and 10: 2. Rabbit Hardware DesignOverviewBe
Page 11 and 12: 2.3 Power ConsumptionWhen minimum p
Page 13 and 14: 3. Core Design and ComponentsCore d
Page 15 and 16: 3.2 Basic Memory DesignNormally /CS
Page 17 and 18: 3.3 PC Board Layout and Memory Line
Page 19 and 20: With a Rabbit-based system it is ea
Page 21 and 22: 3.4.2.3 High Frequency Oscillator C
Page 23: 3.4.2.4 Processor DecouplingThe int
Page 27 and 28: 4.2 Program Loading Process Overvie
Page 29 and 30: 5. Rabbit Memory OrganizationThe Ra
Page 31 and 32: 5.2.1 DefinitionsExtended Code: Ins
Page 33 and 34: 5.3.2 Paged Access in Extended Memo
Page 35 and 36: 6. The Rabbit BIOSWhen Dynamic C co
Page 37 and 38: 6.2 BIOS FlowchartThe following flo
Page 39 and 40: DATAORGBeginning logical address fo
Page 41 and 42: All origin statements must have a u
Page 43 and 44: 7. The System ID BlockThe BIOS supp
Page 45 and 46: 7.2 AccessThe BIOS will read the sy
Page 47 and 48: Table 4. The System ID Block (Conti
Page 49 and 50: 8. BIOS Support for ProgramCloningT
Page 51 and 52: 8.2.3 LED PatternsThe following tab
Page 53 and 54: 9. Low-Power Design and SupportTo g
Page 55 and 56: 9.1 Software Support for Low-Power
Page 57 and 58: 10. Memory PlanningThe following re
Page 59 and 60: 11. Flash MemoriesThe flash memorie
Page 61 and 62: Table 7. 32-Pin Flash Memories Supp
Page 63 and 64: The field flashXPC contains the XPC
Page 65 and 66: 12. Troubleshooting Tips for NewRab
Page 67 and 68: 80 24 80 //terminate bootstrap, sta
Page 69 and 70: Appendix A. Supported Rabbit 2000Ba
Page 71 and 72: Appendix B.Wait State BugB.1 Overvi
Page 73 and 74: If the atomic nature of the operati
Page 75 and 76:
B.4 Enabling Wait StatesMemory wait
Page 77:
Legal NoticeRabbit Semiconductor pr
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Rabbit 2000™ Microprocessor - UTN

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