21285 Core Logic for SA-110 Microprocessor Datasheet
The 21285 is a single-chip interface between an SA-110 microprocessor,
synchronous DRAM memory (SDRAM), read-only memory (ROM), and the PCI bus. It is
designed to support the following three modes of operation:
- PCI-based SA-110 computer. In this configuration, the SA-110 processor is the host
Intelprocessor. It configures all PCI peripherals in the system.
- Attached processor. In this configuration, the SA-110 processor system interfaces directly to
the host system PCI bus. The 21285 is configured by the host processor in the system.
- Intelligent add-in card. In this configuration, the SA-110 processor controls a PCI-based
subsystem that is designed to be plugged into a host system PCI slot. Normally, a PCI-to-PCI
bridge device interfaces the oncard PCI system to the host PCI system. The SA-110 processor
typically configures the devices on the add-in card. Alternatively, these devices and the 21285
can be configured by the host processor in the system.
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