Chapter 1 7
Introduction
Utilities board
Console ethernet
The ethernet I/O port provides a connection to the teststation over
LAN1.
Attention lightbar and LCD
The attention light bar displays environmental information, such as the
source of an environmental error that caused the Utilities board to power
down the node.
The liquid crystal display provides basic system information. The core
logic drives the LCD through the parallel port on the DUART. The
attention lightbar and LCD are detailed in “System displays” on page 12.
COP interface
A serial EEPROM (referred to as COP chip) is located on major boards
with information such as serial number, assembly revision, wire revision,
truncated board part number, and so on. The SMUC connects to the COP
bus selector (CBS) chip on the MIB allowing each COP chip in a node to
be read.
SPUC
The SPUC provides interrupts and error messages to and receives
control messages from the processors through two 18-bit, bidirectional
buses. Each bus connects up to four SPACs. The SPUC also provides core
logic bus arbitration for the processors.
SMUC and Power-on
The SMUC registers system environmental parameters. It connects to
the utilities bus so that processors can monitor the node by accessing the
appropriate CSRs. The SMUC works in conjunction with the power-on
circuit to power up the entire system, and it can operate when the rest of
the node is powered off or in some indeterminate state. The SMUC drives
the environment LCD display. The teststation can also read the
environmental LCD display using the sppdsh utility. See “sppdsh” on
page 268.
