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CS5535-UDC Datasheet(PDF) 56 Page - National Semiconductor (TI) |
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CS5535-UDC Datasheet(HTML) 56 Page - National Semiconductor (TI) |
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56 / 555 page  www.national.com 56 Revision 0.8 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 CCU CCU Local Bus Interface GeodeLink Device Side-band signals to other Native Blocks External Device Interface I/O Cells & Pads GL Adapter (GLA) Embedded PCI Bus Interface |
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