Motorola MVME2300 Series User Manual download pdf (Page 128)

2-58 Computer Group Literature Center Web Site

Raven PCI Bridge ASIC

BUS Bus Number.

Configuration Cycles: Identifies a targeted bus number. If written

with all zeros, a Type 0 Configuration Cycle will be generated. If

written with any value other than all 0s, then a Type 1

Configuration Cycle will be generated.

Special Cycles: Identifies a targeted bus number. If written with all

0s, a Special Cycle will be generated. If written with any value

other than all 0s, then a Special Cycle translated into a Type 1

Configuration Cycle will be generated.

EN Enable.

Configuration Cycles: Writing a 1 to this bit enables

CONFIG_DATA to Configuration Cycle translation. If this bit is a

0, subsequent accesses to CONFIG_DATA will be passed though

as I/O cycles.

Special Cycles: Writing a 1 to this bit enables CONFIG_DATA to

Special Cycle translation. If this bit is a 0, subsequent accesses to

CONFIG_DATA will be passed though as I/O cycles.

CONFIG_DATA Register

The description of the CONFIG_DATA register is also presented in three

perspectives: from the PCI bus, from the MPC bus in big-endian mode, and

from the MPC bus in little-lndian mode. Note that the view from the PCI

bus is purely conceptual, since there is no way to access the

CONFIG_DATA register from the PCI bus.

2Raven PCI Bridge ASIC

0Raven Registers

1 2 ... 123 124 125 126 127 128 129 130 131 132 133 ... 281 282

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Motorola MVME2300 Series User Manual Page 128