Functional Description

PCI Bus Address

PSOFFx Register

8

 

0

 

 

8

 

0

 

 

1

 

2

 

 

3

 

4

 

 

 

 

 

31

 

 

 

 

 

 

16

 

15

 

 

 

 

 

 

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

+

9 0 0 0

3116

=

2

MPC Bus Address

 

1 0 8 0

 

1

2 3 4

 

 

0

 

 

 

 

 

 

15

16

 

 

 

 

 

31

Figure 2-5. PCI to MPC Address Translation

All Raven address decoders are prioritized so that programming multiple decoders to respond to the same address is not a problem. When the PCI address falls into the range of more than one decoder, only the highest priority one will respond. The decoders are prioritized as shown below.

Decoder

Priority

 

 

PCI Slave 0

highest

 

 

PCI Slave 1

 

 

 

PCI Slave 2

 

 

 

PCI Slave 3

lowest

 

 

RavenMPIC Control Registers

The RavenMPIC control registers are located within either PCI memory or PCI I/O space using traditional PCI-defined base registers within the predefined 64-byte header. Refer to the section on Raven Interrupt Controller for more information.

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2-13

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Motorola MVME2300 Series manual RavenMPIC Control Registers, Decoder Priority