Geodelink General Description - Micros Systems Workstation 4 LX Service Manual

WS4 LX Technical Overview
LX800 Processor and TFT Controller
GeodeLink Interface General Description
The GeodeLink Interface is a non-traditional high bandwidth packetized
uni-directional bus for internal peripherals. The GeodeLink architecture connects
the internal modules of the LX800 and companion device using the data ports
defined by GeodeLink Interface Units. Transactions between GeodeLink Devices
and the GLIU are conducted with packets.
The GLIU accepts request packets from masters and routes them to slaves.
Similarly, slave response packets are routed back to the master. The bus is
non-blocking. Several requests can be pending, but order is not guaranteed. All
packets have one source and one destination, broadcasts are not allowed.
The existence of the GeodeLink architecture is generally invisible to the user or
even a system programmer. All GeodeLink initialization and support is handled at
the BIOS level, and additionally provides a Virtual PCI Configuration Space to
abstract the GeodeLink architecture to industry standard interfaces. Through the
Virtual PCI Configuration Space, all GeodeLink devices appear in one PCI
multi-function configuration space header on the external PCI bus.
4-6 Workstation 4 and 4 LX Field Service Guide