Chapter 4: Theory of operation
65
1
Illuminates the LED.
R_LED
Determines the red LED’s state:
0 (zero)
The LED remains unlit.
1
Illuminates the LED.
Last Reset Source
The Last Reset Source register determines the source of the last reset.
FAIL_SOFT
Indicates that the soft reset attempt failed, and was therefore followed by
a hard reset.
IPMI
Indicates the last reset was from the IPMI controller, active high.
POR
Identifies the last reset as a Power on Reset, active high.
Software
Indicates the last reset was from a write to I/O 0x184.
FP
Identifies the last reset as from the front panel switch, active high.
RTM
Indicates that the last reset was from the RTM, active high.
cPCI
Indicates that the last reset was from the CompactPCI backplane,
active high.
WD
Indicates that the last reset was from the Watchdog timer, active high.
Local interrupt control register
The EPC-3307 Special Features CPLD controls several interrupts and the CPU INIT
signal. The Local Interrupt Control register enables or disables these signals. The
next table defines the bit position to control these features. All bits are active high,
with the exception of the ENUM bit.
Soft reset value
: value before soft reset.
IRQ_7
Enables an interrupt on ENUM from the 21554 drawbridge or
CompactPCI backplane. If set to one, an interrupt occurs when
ENUM asserts.
IRQ_11
Enables IRQ 11 when the CPU ejector latch opens. If set to one, IRQ 11
asserts as long as the latch remains in the open position.
INIT
Enables an INIT on a soft reset. If set to one, the INIT line to the
Table 4-11. Last Reset Source register
R/W
Index Default
D7
D6
D5
D4
D3
D2
D1
D0
R/W
0x04
0x20 FAIL_SOFT IPMI
POR Software
FP
RTM
cPCI
WD
Table 4-12. Local interrupt enables
R/W
Index Default
D7
D6
D5
D4
D3
D2
D1
D0
R/W
0x05
0x04
—
IRQ7
—
IRQ 11
—
INIT
—
NMI
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