Texas Instruments PCI445X 1 P2C Interface for TPS22X6 Power Switch, Zoomed Video ZV Interface

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System Implementation

1.3.1P2C Interface for TPS22X6 Power Switch

The interface between the PCI445X device and TPS22X6 power switch is serialized to reduce the number of signal lines. The P2C interface requires only three lines to control the switch. As a PCI445X default, the CLOCK signal is selected from an external source. It is usually provided from RTC, 32.768 kHz. The PCI445X device can also generate this clock from an internal ring oscillator. The typical frequency of the internal ring oscillator is 16 kHz. If using the internal clock source, then a pulldown resistor is required on the CLOCK terminal. If arranging for D3 wake implementation, then connect the power switch RESET terminal to GRST.

Figure 1±4. TPS22X6 Power Switch Interface

			VPPA
VCCA	CLOCK		VCCA
VCCA	VCCB	TPS22X6	VPPB
	DATA	TPS22X6	VPPB
PCI445X
	LATCH		VCCB
		Pulldown on
		CLOCK

1.3.2Zoomed Video (ZV) Interface

SLOT

A

SLOT

B

The PCI445X device has an internally buffered and selectable ZV interface. It supports three ZV sources, two from PC Cards and one from an external source. An auto ZV detect function provides software independent ZV switching. The auto ZV detect function senses the pixel clocks, arbitrates three inputs, and selects one of them according to priority bits.

Figure 1±5. Example of a ZV Interface

3rd ZV Source

Buffer

SLOT

A

SLOT

B

23

23

ZVPCLK ZVSTAT

PCI445X

19	Graphic
	Controller
4	Audio	Stereo
	Codec

Sound

Controller

1-14

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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 Socket Power Switches Optional PCI SignalsPCI and ISA Style Interrupt Distributed DMA DdmaSocket Activity LEDs MFUNC7±MFUNC0 Terminal AssignmentsMiscellaneous Functions Description Serialized Interrupt ControlCardBus Reserved Terminal Signaling Power Savings ModeAsynchronous CSC Interrupt Generation Memory Burst R/W Operation ControlSocket Power Lock 12.9 SMI12.11VCC Protection ZV Port Control and Auto Detect FunctionSystem Implementation Clamping RailsPCI Bus Interface PERR, SERR, and LockPrst PCI reset and Grst Global reset INTA, INTB, and Intc4 2-Wire I2C Interface for Eeprom Socket power supplyPC Card Interface 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 LPSBios Considerations InitializationPCI Standard Registers Initialization 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