PowerPC 405GP Embedded Processor Data Sheet
General Purpose IO (GPIO) Controller
• Controller functions and GPIO registers are programmed and accessed via memory-mapped OPB bus
master accesses
• 23 GPIOs are pin-shared with other functions. DCRs control whether a particular pin that has GPIO
capabilities acts as a GPIO or is used for another purpose. The 23 GPIOs are multiplexed with:
- 7 of 8 chip selects
- All seven external interrupts
- All nine instruction trace pins
• Each GPIO output is separately programmable to emulate an open-drain driver (i.e., drives to zero, three-
stated if output bit is 1)
Universal Interrupt Controller (UIC)
The Universal Interrupt Controller (UIC) provides the control, status, and communications necessary between
the various sources of interrupts and the local PowerPC processor.
Features include:
• Supports seven external and 19 internal interrupts
• Edge triggered or level-sensitive
• Positive or negative active
• Non-critical or critical interrupt to processor core
• Programmable critical interrupt priority ordering
• Programmable critical interrupt vector for faster vector processing
10/100 Mbps Ethernet MAC
• Capable of handling full/half duplex 100Mbps and 10Mbps operation
• Uses the medium independent interface (MII) to the physical layer (PHY not included on chip)
JTAG
• IEEE 1149.1 test access port
• IBM RISCWatch debugger support
• JTAG Boundary Scan Description Language (BSDL)
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6/20/03
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