Texas Instruments PCI445X manual PCI and ISA Style Interrupt, Socket Power Switches

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System Features Selection

automatically assigned on the dedicated SDA and SCL terminals. A pullup resistor (typically 10 kΩ) must be added on SDA and SCL when using an EEPROM. The value of the pullup resistor can vary for different EEPROMs. Refer to the EEPROM data sheet or contact the manufacturer for the recommended pullup resistor value.

1.1.6PCI and ISA Style Interrupt

The PCI445X device provides three modes of interrupt signaling:

￿Parallel PCI interrupts only

￿Parallel PCI interrupts and serialized ISA interrupts

￿Serialized PCI interrupts and serialized ISA interrupts

Three PCI interrupts (INTA, INTB, and INTC) may be used and signaled in either the parallel mode using the MFUNC terminals or in the serial mode. The number of PCI interrupts may be reduced by setting the INTRTIE bit (system control register, PCI offset 80h, bit 29), which allows both the CardBus functions (function 0 and function 1) to report and use INTA or by setting the TIEALL bit (system control register, PCI offset 80h, bit 28) which allows all 3 functions (both CardBus + OHCI) to report and use INTA.

1.1.7Socket Power Switches

The PCI445X device supports TPS2206 and TPS2216 power switches. Refer to the detailed explanation on each data sheet. The interface between the power switch and the PCI445X device is serialized, so an external or internal clock source is required. By default an external power switch clock is assumed but this can be changed to use the oscillator internal to the PCI445X device by setting P2CCLK bit (system control register, PCI offset 80h, bit 27).

1.1.8Distributed DMA (DDMA)

Most of the systems do not use this function. This function needs PCGNT and PCREQ signals. PCGNT can be assigned to the MFUNC2 or MFUNC3 terminal. PCREQ can be assigned to the MFUNC0, MFUNC4, or MFUNC7 terminal. (See Section 1.3.4.5, Distributed DMA.)

1.1.9Optional PCI Signals

1.1.9.1CLKRUN

CLKRUN is the primary method for power reduction on the PCI bus. Most of the notebook PCs implement CLKRUN. The PCI445X device has a dedicated CLKRUN terminal. If it is not used, then a pulldown resistor is required to prevent oscillations on this input.

1.1.9.2LOCK

This signal can be assigned on the MFUNC1, MFUNC3 or MFUNC7 terminal.

1-4

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Contents Implementation Guide Important Notice Read This First About This ManualCsr ±a /user/ti/simuboard/utilities Related Documentation From Texas Instruments Page Contents Viii Figures Tables PCI445X Device Topic±1. Typical System Architecture System Features Selection PCI and ISA Style Interrupt Socket Power SwitchesOptional PCI Signals Distributed DMA DdmaMiscellaneous Functions Description Socket Activity LEDsMFUNC7±MFUNC0 Terminal Assignments Serialized Interrupt ControlAsynchronous CSC Interrupt Generation CardBus Reserved Terminal SignalingPower Savings Mode Memory Burst R/W Operation Control12.11VCC Protection Socket Power Lock12.9 SMI ZV Port Control and Auto Detect FunctionPCI Bus Interface System ImplementationClamping Rails PERR, SERR, and LockPrst PCI reset and Grst Global reset INTA, INTB, and IntcPC Card Interface 4 2-Wire I2C Interface for EepromSocket power supply Damping resistor on Cclk terminal±1. Registers and Bits Loadable Through Serial Eeprom EepromSample PCI445X Eeprom Data File System Implementation 1 P2C Interface for TPS22X6 Power Switch Zoomed Video ZV InterfaceInterrupt Signaling Interface Miscellaneous SignalsRequirement of Pullup/Pulldown Resistors ±2. PC Card Interface Pullup Resistor List² ³±3. PCI Bus Interface Pullup Resistor List ±4. Miscellaneous Terminals Pullup Resistor List±5. Required Pullup/Pulldown Resistors LPSPCI Standard Registers Initialization Bios ConsiderationsInitialization System Sleeping State Consideration PCI TI Proprietary Registers InitializationRegister save/restore Docking System ConsiderationImportant Information Global Reset Only Bits, PME Context Bits TopicGlobal Reset Only Bits/PME Context Bits Table A±1.Global Reset Only Cleared BitsTable A±2.PME Context Bits Page PME and RI Behavior Table B±1.CardBus Ctschg and Wake-Up Signals Truth Table PME and RI BehaviorPCI445X Buffer Types Signal Name Terminal Type PCI445X Buffer TypesACVS2 BCAD22 GND PHYDATA6 ZVUV4 TSO Table C±2. Buffer Type Abbreviations Buffer Type Description
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