Publication No. SBC329-HRM/1
Functional Description 77
5.21 Resets and Interrupts
5.21.1
Interrupt Controllers
The PCH provides an ISA-compatible Programmable Interrupt Controller (PIC) that
incorporates the functionality of two 82C59 interrupt controllers. These are cascaded
so that 14 external and two internal interrupts are possible. In addition, the PCH
supports a serial interrupt scheme.
The PCH also incorporates an Advanced Programmable Interrupt Controller (APIC).
5.21.2
Hardware Reset
There are several methods to reset the SBC329, and each generates one of two reset
types: a global reset (which causes the platform to enter a sleep state until the reset
source is removed) or an edge-triggered reset (which cannot be used to hold the
board in reset), and they may not result in a reset if the processor has crashed. The
table below summarizes the reset sources:
Table 5-26 Reset Sources
Reset Source
Reset Type Comments
BIT Reset Request (FPGA register)
Edge
BIT LEDs and BIT status registers are not reset
TAC reset switch
Edge
Cannot be used to hold the board in reset
XMC reset
Edge
VPX SYSRESET~
(must be asserted for >10ms)
Global
Can be used to hold the board in reset
VPX MSKABLE_RESET~
(must be asserted for >10ms)
Global
Will only cause reset if unmasked in the
Watchdog timer expired
Global
NOTE
Global type resets will result in the SBC329 entering a sleep state, so it is normal to see on-
board LEDs switching off accordingly, and it does not indicate a fault condition.
When operating as the VPX System Controller, the SBC329 asserts the VPX
SYSRESET~ signal whenever it enters a reset state.