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Specification Changes
14 Intel
®
80303 and 80302 I/O Processors Specification Update
Specification Changes
1. Summary of the Intel® 80302 I/O Processor
Problem: The Intel® 80302 I/O processor is based on the A-2 stepping of the Intel® 80303 I/O processor.
The 80302 I/O processor is identical to the 80303 I/O processor, except the SDRAM and internal
bus run at 66 MHz. For applications that use the I
2
C unit, the I
2
C clock is generated from the
internal bus clock, so the ICCR (I
2
C Clock Count Register) needs to be properly adjusted.
The Device ID Register (DIDR; 1002H), in the Bridge configuration header, is 0308H for the
80302 I/O processor.
The ATU Device ID Register (ATUDID; 1202H), in the ATU configuration header, is 5308H for
the 80302 I/O processor.
The 80303 I/O processor manual, datasheet and design guide should be used when designing with
the 80302 I/O processor.
Status: The 80302 I/O processor will be introduced with the A-2 stepping.