GE Solar 8000M/i Service Manual page 35

Communication system
2026265-075C
Equipment overview: Theory of operation
PCI bus implementation
The PCI Bus is used to communicate with the video accelerator and two
(2) expansion slots. The PCI Bus is a 32 bit, 33MHz implementation. The
PCI Bus interface to the MPC860 Bus was accomplished by
implementing a purchased Intellectual Property (IP) design in the FPGA
for a Host Bridge and PCI Bus Arbiter.
Ethernet for unity
The Processor PCB provides one (1) IEEE 802.3 10BaseT compliant
Ethernet port. This port is implemented using an SCC within the
MPC860 and an LXT905 Serial Interface Adapter. An Ethernet Port
Address label is affixed to the connector bracket and visible to the user
without disassembly.
Processor SCC channel – The first Serial Communication Controller
(SCC) is used to implement the Ethernet channel.
Serial interface adapter – The LXT905 is used as the Serial Interface
Adapter (SIA) for each Ethernet channel.
TRAM-NET (2 ports)
The Processor PCB provides an interface to the GEHC proprietary
Carrier Sense Multiple Access/Collision Detection (CSMA/CD) network,
TRAM-NET, by providing a TRAM-NET Controller (TNC) and a Hub
facility. The TRAM-NET 1 port provides TRAM-NET communication
only for connection to the Tram-rac 4A or Tram-rac 2. The TRAM-NET
2/ePort port provides TRAM-NET communication or ePort
communication for connection to the PDM with an ePort cable. When the
TRAM-NET 2/ePort connector is connected to PDM, the connection
uses ethernet through the Broadcom ethernet switch.
Processor SCC channel – The MPC860 fourth Serial Communication
Controller (SCC) is used to implement the TRAM-NET Controller. This
is done by operating the SCC in transparent mode and using software to
provide the functionality that was originally provided by an external
communications processor.
Hub – The Hub chip is the Solar 9000 FPGA implementation. It
accommodates the TNC port as well as four (4) external ports functioning
as a "Header Hub". The Header Hub "turns the signal around" by
sending the "Up" signal out on the "down" path, generates the carrier
sense signal so that the TNC will not cause an "out of window" collision,
generates Collision Presence signals at the detection of a collision, and
retimes the bits.
NOTE
The signals out of the Hub are at +5V signal levels, so any +3.3V
devices interfacing to the Hub must be +5V tolerant.
Drivers and receivers – The DS8923 Dual Differential Driver/Receiver
pair is used to convert the signals between the TRAM-NET differential
RS-422 level and TTL levels.
Solar 8000M/i patient monitor 2-19