MV64460
System
Controller
FPGA
Watchdog
Timer
MPC7448
Processor
HRESET#
SMI#
WD_EXP#
WD_NMI#
MPP Port
SMI#
Interrupt
Controller
CPU_INT#
HRESET#
SMI#
INT#
other board
devices
C2K User’s Guide
4-8
Functional Blocks
Figure 4-1
Watchdog timer circuitry
4.13 FPGA
The FPGA provides internal registers for the following functions (
see “FPGA Registers” on
page 5-4
):
• GPIO
• Counters/timers
• Interrupt Aggregation
• Reset management
• USARTs
• Device Bus management
• SMI#
4.13.1 System Management Interrupt
The FPGA can generate the System Management Interrupt (SMI) input to the processor. The SMI
is a level-sensitive processor input which the FPGA asserts if one or more of the following
interrupt sources are asserted:
• Backplane NMI# (maskable)
• Backplane DEG# (maskable)
• Backplane FAL# (maskable)
• Watchdog NMI# (maskable)
Each interrupt source is maskable through the FPGA SMI Mask Register (
see “SMI Mask
Register” on page 5-14
). These mask bits are set at reset.
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