82434LX Datasheet, PDF (39/191 Pages) Intel Corporation – PCI, CACHE AND MEMORY CONTROLLER PCMC

82434LX 82434NX
Type 1 Access
If the Forward Register is non-zero a Type 1 configuration access is generated on PCI For type 1 configuration
cycles AD 1 0 ^e01 AD 10 2 are generated the same as for the type 0 configuration cycle Host CPU
address bits A 11 8 contain the specific device number and are mapped to AD 14 11 AD 23 16 contain the
Bus Number of the PCI Bus that is to be accessed and corresponds to the Forward Address Register bits
70
During a Type 1 configuration access AD 1 0 ^e01 (Figure 7) The Register Index and Function Number are
mapped to the AD lines the same way in Type 1 configuration access as in a Type 0 configuration access
CPU address bits A 11 8 are mapped directly to PCI lines AD 14 11 as the Device Number The contents of
the Forward Register are mapped to AD 23 16 to form the Bus Number
Figure 7 Mechanism 2 Type 1 Host-to-PCI Address Mapping
290479 – 8
39