Texas Instruments PCI445X PC Card Interface, 4 2-Wire I2C Interface for Eeprom, CD line filtering

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System Implementation

1.2.3PC Card Interface

The PC Card interface has two modes: the 16-bit interface mode and the CardBus 32-bit interface mode.

Damping resistor on CCLK terminal

A series-damping resistor is recommended on the CCLK signal. The damping resistor is system dependent. If line impedance is in the 60±90-Ωrange, a 47-Ωresistor is recommended (see PC Card Standard,

Revision 7).

CD line filtering

PCI445X device has the advanced CDx line filtering circuit. It provides 90 ∝s of noise immunity. A 270-pF filtering capacitor is still recommended for each of the power supply terminals: VCC, VCCS, and VCCP.

Socket power supply

Socket power is supplied through TPS22X6 power switches. The

PCI445X device requires VCCA and VCCB for the protection of the other device(s) on the bus.

1.2.42-Wire (I2C) Interface for EEPROM

The PCI445X device can load configuration registers from EEPROM after G_RST assertion. The SDA and SCL lines require pullup resistors to enable this function. Depending on the EEPROM requirements, the SDA and SCL lines must be pulled up to 3.3 V or 5 V.

Figure 1±3. EEPROM 2-Wire Interface

EEPROM

SDA

SCL

PCI445X

TPS22X6

EEPROM slave address should be 101 0000b.

1-10

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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 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