Themis Computer
4-5
4. Hardware Overview
10-bit column addressing is supported on the modules. Considerable attention was paid to minimize the power
consumption of USPII
i
-1v. The maximum active power consumption of a 64 MB memory module is 4.212
watts.
.
Figure 4-1.
Memory Sub-System Topology
4.3
PMC Carrier Subsystem
The PMC Carrier Board subsystem supports up to three (3) standard PMC boards in either the second or third
slot of the USPII
i
-1v product configuration. If the I/O board or Creator Graphics card is included in the
product configuration (USPIIi-1v/3), the PMC carrier board is physically located in the third slot. Otherwise,
the PMC Carrier board is located in the second slot (USPIIi-1v/2p).
In addition to the standard PMC I/O, 64 bits of configurable User I/O are provided from the VME P2
connector directly to the PMC #1 and PMC #2 board positions. All 64 bits may be routed to PMC #1, leaving
0 bits of User I/O for PMC #2. Or, 32 bits may be routed to PMC #1 and to PMC #2. In the latter case, PMC
#1 will utilize the upper VME P2 signals, VME P2 A[32..17] and VME P2 C[32..17] while PMC #2 will
utilize the lower VME P2 signals, VME P2 A[16..1] and VME P2 C[16..1]. The signals are available on the
J5 connector of PMC #1 and the J8 connector of PMC #2. If all 64 bits of User I/O are routed to PMC #1, it
utilizes all 64 signals of the VME P2 connector. In this case, all 64 signals are available on the J5 connector
of PMC #1. For a diagram illustrating the locations of the various connectors and the PMC carrier slots
Section D.3, "PMC Board," on page D-6.
The selection of the User I/O signal routing is performed by installing a User I/O adapter card on J11 and J12
of the PMC Carrier board. If the adapter card is left uninstalled all 64 bits of User I/O are routed to PMC #1.
If the adapter card is installed, 32 bits of User I/O are routed to PMC #1 and 32 bits of User I/O are routed to
PMC #2. Consult the factory for that option.
4.4
OpenBoot PROM
The OpenBoot PROM (OBP) can be accessed through the EBus2. OBP code is contained in Flash Memory
and provides the following functionality:
• Runs start-up diagnostic tests.
• Initializes the host machine.
Bank #0
Bank #2
Bank #3
Bank #1
Bank #7
Bank #5
Bank #4
Bank #6
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