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Mailbox
A software-created data structure in memory used to read and write to I/O
device registers.
Memory
Systems use the MS7AA memory modules, available with 64, 128, 256, or
512 Mbytes of memory. Total memory supported is determined by the op-
erating system. Memory transfers are 64 bytes in length.
Memory interleaving
Method to optimize memory access time; the console program automati-
cally interleaves the memories in the system unless a command is used to
set a specific interleave or no interleave (which would result in serial ac-
cess to each memory module). Interleaving causes a number of memories
to operate in parallel.
More protocol
A protocol used on the XMI bus that allows XMI nodes to make noninter-
locked memory reads and writes. Using the More protocol increases I/O
performance.
Node, LSB
LSB nodes are numbered from 0 to 8 and correspond to specific slots in the
LSB card cage.
Physical address space
The 1 terabyte of physical address space that the LSB bus can access using
a 40-bit memory address space.
Power
Three-phase AC power is supplied to the AC input box which is then fed to
one to three power regulators that provide 48 VDC. Power enters the LSB
card cage through a 48V filter and then is distributed to the bus bars on
the centerplane. Each module on the LSB bus has a power converter,
which converts the 48V to the voltage required by the module. Power se-
quencing logic is provided by the CCL module.
Glossary-7
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