3 Feature/Protocol Descriptions

The following sections give an overview of the PCI7x21/PCI7x11 controller. Figure 3−1 shows the connections to the PCI7x21/PCI7x11 controller. The PCI interface includes all address/data and control signals for PCI protocol. The interrupt interface includes terminals for parallel PCI, parallel ISA, and serialized PCI and ISA signaling.

PCI Bus

EEPROM

PCI7x21/

PCI7x11

1394a

Socket

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Power

 

 

 

 

 

 

 

 

Switch

 

 

 

 

 

PC

 

 

 

PC

 

 

 

 

 

 

 

 

Card/

 

 

 

 

Card/

UltraMedia

 

 

 

 

UltraMedia

 

Card

 

 

 

 

Card

 

 

 

 

 

 

 

 

 

 

 

SD/MMC

MS/MSPRO

SM/xD

SD/MMC

Power Switch

Power Switch

Figure 3−1. PCI7x21/PCI7x11 System Block Diagram

3.1 Power Supply Sequencing

The PCI7x21/PCI7x11 controller contains 3.3-V I/O buffers with 5-V tolerance requiring a core power supply and clamp voltages. The core power supply is always 1.5 V. The clamp voltages can be either 3.3 V or 5 V, depending on the interface. The following power-up and power-down sequences are recommended.

The power-up sequence is:

1.Power core 1.5 V.

2.Apply the I/O voltage.

3.Apply the analog voltage.

4.Apply the clamp voltage. The power-down sequence is:

1.Remove the clamp voltage.

2.Remove the analog voltage.

3.Remove the I/O voltage.

4.Remove power from the core.

NOTE: If the voltage regulator is enabled, then steps 2, 3, and 4 of the power-up sequence and steps 1, 2, and 3 of the power-down sequence all occur simultaneously.

3−1

Page 57
Image 57
Texas Instruments PCI7611, PCI7411, PCI7621, PCI7421 manual Power Supply Sequencing, Eeprom, Sd/Mmc Ms/Mspro