GE CM6 Hardware Reference Manual page 61

General Purpose I/O
Interrupt Circuitry
COP Debug Interface
JTAG Interface
GE Intelligent Platforms – CM6 Hardware Reference Manual, Fourth Edition
For registration and identification of a workstation in a LAN, a unique Network
Interface Card (NIC) number is required. The NIC address is located in the
SPD EEPROM.
The CM6 provides 8 general purpose I/Os which are optional available at the
rear cPCI_J2 connector. The GPIOs are controlled by the two PCIe/PCI
bridges.
The MPC8641 has an internal Programmable Interrupt Controller (PIC) which
supports the following interrupt sources:
• External—Off-chip signals, IRQ[0:11] see chapter xxx for CM6 connection
• Internal interrupt sources These are on-chip sources from peripheral logic
within the integrated device signaling error conditions that need to be
addressed by software.
Interrupts generated from within the PIC itself, which are as follows:
— Global timers A and B internal to the PIC
— Interprocessor interrupts (IPI)—Intended for communication between
different processor cores on the same device. (Can be used for self-interrupt
in single-core devices)
— Message registers—From within the PIC. Triggered on register write,
cleared on read. Used for interprocessor communication.
— Message-shared registers—From within the PIC. Triggered on register
write, cleared on read. Used for cross-program communication.
— Four 32-bit message interrupt channels.
— Two groups of four global 32-bit timers clocked with the MPX clock or the
RTC (25MHz) input. Timers within each group can be concatenated to time
longer durations.
The CM6 provides the COP debug interface signals to rear connector cPCI_J2.
The COP signals are driven 3.3 V. The transition module CTM19 provides a
compliant header for easy connection to a COP debug tool.
Note:
For correct operation of the COP interface at the CTM19 it is mandatory that
the CTM19 is supplied with 3.3 V power.
The CM6 provides an IEEE 1149.1 (JTAG) Scan chain that can be used to
check major components included in the chain for open and short circuits, and
continuity. The JTAG Scan chain is driven at +3.3 V. The Boundary Scan chain
for CM6 includes the following components:
• PI7C9X110 PCIe/PCI Bridge for cPCI
• PI7C9X130 PCIe/PCI Bridge for PMC
• MV88E1118 Giga Phy A
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