21285 Core Logic for SA-110 Datasheet
Table 7-1. Register Access
This chapter describes the following categories of registers:
PCI Configuration Space Registers
PCI configuration space registers conform to the PCI Local Bus Specification, Revision 2.1. These
registers are accessed from the PCI by configuration reads and configuration writes, and are byte
writable. They are also accessible from the SA-110 (offset is from address 4200 0000h).
shows the allowable access to each register.
PCI configuration space registers
PCI control and status registers
SA-110 control and status registers
— Interrupt controller registers
— Timer control registers
— DMA control registers
— Miscellaneous registers
O control registers
Read only. Writes have no effect.
Read. Write 1 to clear.
Write zero to clear.
Read. Write 1 to set.