Functional Blocks
29
When payload power is off, the console port transceiver is connected to the MMC. The console
port transceiver is powered from the AMC Management Power (MP) pin. A hard reset leaves
the console port focus unchanged. This is useful when access to time sensitive software
queries is desired. A payload power reset always returns focus to the MMC.
For console port pinout information, see
“Console Port Connector (J2),” on page 45
Push Button Reset
The front panel push button (see
Figure 2-1, “AMC131 Front Panel,” on page 23
) provides a
hard reset if pressed.
The AMC131 also supports power and soft reset options. For information about the AMC131
reset options, see
Chapter 6, “Reset Configuration,” on page 79
Real-time Clock with Battery Backup
The AMC131 features an I2C-based real time clock (RTC). This device contains the year,
month, date, day, hours, minutes, and seconds. The clock operates in the 24-hour binary-
coded decimal (BCD) format. Corrections are automatically made for 28, 29, 30 and 31 day
months including leap year.
An alarm clock function is provided on the real-time clock, with one second minimum resolution
that can be enabled to generate payload processor interrupts.
The AMC131 supports an external, industry standard, 2016 size, coin cell battery to ensure that
the clock remains current when the computer is turned off. The battery life is five years.
Watchdog Timer
The watchdog timer function provides a timer independent of the MPC8641D that can be used
to monitor system operation. Its duration is programmable, with a range of 26.1ms to 28.5
minutes. When enabled, the watchdog timer can be configured to provide an IRQ7 interrupt to
the MPC8641D, a hard reset pulse to the board, or a kill function that causes the board to halt
until power is cycled. The Watchdog configuration and operational functions are controlled
through a set of custom registers in the onboard logic. The Watchdog function powers up in the
disabled state and must be enabled under software control for all modes of operation.
The PT-supplied PTBMON debugger has the capability to utilize the Watchdog functions. For
more information about PTBMON, see the
PTBMON Boot Monitor User Guide
.
Содержание AMC131
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