PXA3xx Design Guide - Marvell

More documents

Recommendations

Info

PXA3xx Processor FamilyDesign GuideFigure 5:TXTAL_IN and TXTAL_OUT Connections to External Clock SourcesTXTAL_IN, TXTAL_OUTconnection to 32.768 kHz crystalTXTAL_IN, TXTAL_OUT connectionto 32.768 kHz clock source22 pFTXTAL_IN32.768 kHzclock generatorTXTAL_IN32.768 kHz22 pFTXTAL_OUTGNDTXTAL_OUT4.4.1.2 Using an External 32.768 kHz ClockWhen using an external clock oscillator to supply the RTC timing, power the oscillator from the samesource that is driving the VCC_BBATT supply input. Connect the external oscillator output to theTXTAL_IN pin. TXTAL_OUT must be grounded.NoteRefer to the Marvell ® PXA30x, PXA31x, and PXA32x Processor Electrical, Mechanical,and Thermal Specification for external 32.768 kHz oscillator-output drive levels.4.4.1.3 Using the On-Chip Oscillator with a 13.000 MHz CrystalThe Marvell ® PXA30x, PXA31x, and PXA32x Processor Electrical, Mechanical, and ThermalSpecification provides specifications for the 13.000 MHz crystal. To use the on-chip crystal oscillator,connect the 13.000 MHz crystal between the PXTAL_IN and PXTAL_OUT pins of the PXA3xxprocessor family. The on-chip oscillator provides the required load capacitance. Therefore, do notconnect external load capacitors to the 13.000 MHz crystal. Place the crystal as close as possible tothe PXTAL_IN and PXTAL_OUT pins of the PXA3xx processor family to minimize PCB trace lengthand capacitance.Route these traces parallel to each other on the same PCB layer. If the 13.000 MHz oscillator outputis used by other components in the system, connect these inputs to the PXA3xx processor familyCLK_POUT output pin, and enable it. Do not attempt to connect an external load directly to thePXTAL_OUT pin.WarningDo not route CLK_POUT or other high-speed digital signals near the 13.000 MHzcrystal or other crystal signals.Doc. No. MV-S301368-00 Rev. A Copyright © 2009 MarvellPage 44 April 6, 2009, Released
Figure 6:PXTAL_IN and PXTAL_OUT Connections to External Clock SourcesPXTAL_IN, PXTAL_OUTconnection to 13-MHz crystalPXTAL_IN, PXTAL_OUTconnection to 13-MHz clock source13 MHzPTXAL_IN13-MHz clockgeneratorPXTAL_INPXTAL_OUTN/CPXTAL_OUT4.4.1.4 Using an External 13.00 MHz ClockWhen using an external clock oscillator to supply the 13 MHz timing, power the oscillator from thesame source that is driving the VCC_MVT supply input. Connect the oscillator output to thePXTAL_IN pin. PXTAL_OUT is left floating.NoteRefer to the Marvell ® PXA30x, PXA31x, and PXA32x Processor Electrical, Mechanical,and Thermal Specification for external 13 MHz oscillator-output drive levels.4.4.2 Power InterfaceTo enable low-power system design, the PXA3xx processor family has separate power-supplydomains for the PXA3xx processor family core, memory, and peripherals. All functional units within apower domain connect to the same power supply and are powered up and down together. Thisarchitecture provides flexibility in system configuration (for example, selection of different I/Ovoltages for memory and peripherals) and efficient power management (for example, selectingwhich peripherals are powered at the same time).In a complete system, there are other components besides the processor (such as DRAM, flashmemory, audio CODECs, touchscreen controllers, and specialized companion chips) that have theirown unique power requirements. In many designs, a highly integrated power controller suppliespower for the processor and other components, particularly those that interface directly to thePXA3xx processor family. An advanced power controller contains circuitry for charging batteries andpowering the display panel, and includes other analog functions as required by the system. ThePXA3xx processor family provides several dedicated control signals as well as an Inter-IntegratedCircuit (I 2 C) interface (PWR_I2C) to communicate with an external power-management integratedcircuit (PMIC)..Copyright © 2009 MarvellDoc. No. MV-S301368-00 Rev. AApril 6, 2009, Released Page 45
Page 5 and 6: 10.2 Signals ......................
Page 7 and 8: 17.2 Signals ......................
Page 9 and 10: 26.2 Signals ......................
Page 11 and 12: Copyright © 2009 MarvellDoc. No. M
Page 13 and 14: Figure 42: SPI Protocol Interface B
Page 15: TablesTable 1: How Design Guide Cha
Page 18 and 19: PXA3xx Processor FamilyDesign Guide
Page 94 and 95:
PXA3xx Processor FamilyDesign Guide
Page 96 and 97:
Page 98 and 99:
Page 100 and 101:
Page 102 and 103:
Page 104 and 105:
Page 106 and 107:
Page 108 and 109:
Page 110 and 111:
Page 112 and 113:
Page 114 and 115:
Page 116 and 117:
Page 118 and 119:
Page 120 and 121:
Page 122 and 123:
Page 124 and 125:
Page 126 and 127:
Page 128 and 129:
Page 130 and 131:
Page 132 and 133:
Page 134 and 135:
Page 136 and 137:
Page 138 and 139:
Page 140 and 141:
Page 142 and 143:
Page 144 and 145:
Page 146 and 147:
Page 148 and 149:
Page 150 and 151:
Page 152 and 153:
Page 154 and 155:
Page 156 and 157:
Page 158 and 159:
Page 160 and 161:
Page 162 and 163:
Page 164 and 165:
Page 166 and 167:
Page 168 and 169:
Page 170 and 171:
Page 172 and 173:
Page 174 and 175:
Page 176 and 177:
Page 178 and 179:
Page 180 and 181:
Page 182 and 183:
Page 184 and 185:
Page 186 and 187:
Page 188 and 189:
Page 190 and 191:
Page 192 and 193:
Page 194 and 195:
Page 196 and 197:
Page 198 and 199:
Page 200 and 201:
Page 202 and 203:
Page 204 and 205:
Page 206 and 207:
Page 208 and 209:
Page 210 and 211:
Page 212 and 213:
Page 214 and 215:
show all

PXA3xx Design Guide - Marvell

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?