CS5535 datasheet(56/555 Pages) NSC

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Global Concepts and Features (Continued)

3.4

EMBEDDED PCI ADAPTER (PA)

A GeodeLink Device with an embedded PCI bus is illus-

trated in Figure 3-5. Note the similarity with Figure 3-4

"Typical CS5535 GeodeLink Device" on page 55. The only

difference is the PCI Adapter (PA) located in the center of

the figure. The PA allows a module designed for the PCI

bus to be easily embedded in a GeodeLink architecture. It

is used to embed the USB core into the GeodeLink archi-

tecture.

The PA provides the following features:

• Converts GLA Local Bus transactions to/from PCI bus

transactions.

• Provides PCI bus configuration transactions from GLD

MSR transactions.

• Performs PCI bus protocol checking and sets the GLD

Error Flag if appropriate.

• Capable of responding to both single data phase as well

as burst transactions.

• Closely follows the functioning of the GLA.

• Capable of issuing retries to the master when the Local

bus side is taking too long to complete the current trans-

action.

• Safely handles all the error conditions possible during

normal and configuration PCI transactions.

Using the Virtual PCI Configuration Space (see Section 3.1

"GeodeLink Architecture Overview" on page 50), the Core

BIOS lifts this embedded physical interface into the multi-

function PCI configuration space header mentioned previ-

ously.

Figure 3-5. CS5535 GeodeLink Device With Embedded PCI Bus

MSRs

Native

Block

(NB)

Native

Block

Registers

PCI

Adapter

(PA)

Reg In

Data In

Reg Out

Data Out

Diag

ASMI

ERR

CCU

Local

Bus

Interface

GeodeLink Device

Side-band signals to other Native Blocks

External Device Interface

I/O

Cells &

Pads

Adapter

(GLA)

Embedded

PCI Bus

Interface

CS5535 Datasheet(PDF) 56 Page - National Semiconductor (TI)

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