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Asynchronous Serial Port
The PrPMC750 module contains one 16C550C UART device for use as a
serial debug port. This serial port is wired as an RS-232 interface to the
2mm debug header. An onboard 1.8432 MHz oscillator provides the baud
rate clock for the UART. The UART is accessed through the Hawk
External Register Set interface. Refer to the Programming Model section
for additional information.
Clock Generator
The PrPMC750 module clock generator uses an MPC972 PLL clock driver
to provide the clocks for the processor, the Hawk ASIC, and the SDRAMs.
All clocks are referenced to the PCI clock input on PMC connector P11.
The processor core and bus speeds listed in this document are based on a
33.33 MHz PCI bus clock input. For the 350 MHz processor version, the
clock generator uses a 3x multiplier to generate the processor and memory
bus clocks (100 MHz). For the 233 MHz version, a 2x multiplier is used
(66 MHz processor bus).
Processor Core Power Supply
The PrPMC750 uses a switching regulator to generate the processor core
voltage from the +5V input. The processor core power supply provides
2.6V for the 233 MHz processor version and 2.05V for the 350 MHz
processor version.
PCI Interface
The PMC750 module contains four EIA-E700 AAAB connectors which
provide a 32/64-bit PCI interface to an IEEE P1386.1 PMC or VITA 32-
199x processor PMC compliant carrier board. Connectors P11-P13
provide the 32/64-bit PCI interface while P14 provides an I/O path from
the module to the host board. Signals routed to P14 include the I2C bus,
the RS-232 debug port, the processor JTAG/COP, and the Bank B FLASH.
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Block Diagram
3
3-13
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