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SROM
The PrPMC750 module contains three 3.3V, 256 x 8 Serial EEPROM
devices (AT24C02) onboard. One Serial EEPROM provides for Vital
Product Data (VPD) storage of the module hardware configuration, one
may be programmed with user defined configuration data, and the other
provides for Serial Presence Detect (SPD) memory configuration
information. The Serial EEPROMs are accessed through the I
Hawk ASIC.
2
The I
on the P14 PMC User I/O connector. The interface to the memory
expansion connector allows the processor to determine the configuration
of the memory mezzanine. The connection to the PMC connector provides
a means to interface to an optional configuration SROM on the carrier
board. This will allow the PrPMC750, operating as the System Controller,
to determine configuration information from the host board. Refer to the
PRPMC750 Programmer's Reference Guide (PRPMC750A/PG) for
SROM device address assignments and additional system configuration
information.
System Registers
The PrPMC750 System Registers include the Status, Module Fail, Module
Reset and PCI Interrupt registers, which provide module control and status
information. Refer to the PRPMC750 Programmer's Reference Guide for
additional details.
Timers
Timers on the PrPMC750 board are provided by the Hawk ASIC. These
timers are described in the following two subsections.
32-Bit Timers
Four 32-bit timers are provided by Hawk (MPIC) that may be used for
system timing or to generate periodic interrupts. Each timer is driven by a
divide-by-eight prescaler, which is synchronized to the PPC processor
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C port is also routed to the memory expansion connector and to pins
Block Diagram
3
2
C port in the
3-11
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