Intel iapx 432 manual Physical Reference mDE Addressing

iAPX 432 Interface Processor Architecture Reference Manual

5-2. PHYSICAL REFERENCE mDE ADDRESSING

In physical reference mode the object reference attribute of a

window is replaced b¥ a 24-bit segment base address. Upon recognition of a subrange address reference the IP determines the transfer displacement as in logical reference node. It forms the transfer address b¥ adding the displacement to the segment base address. The 432 transfer length is always set to 216 bytes so that no length of transfer faults can occur. No system objects are used in physical reference node addressing.

Note that in physical reference mode, window 0 may be opened in either random or block transfer mode and window 1 may be opened onto either 432 memory space or the interconnect address space. An IP operating in physical node may also change the characteristics of windCM 4, the control windCM.

5-3. PHYSICAL REFERENCE mDE FUNCI'ICNS

The IP controller may request execution of four functions in physical reference node. These corresJ.X)nd closely, but are not

always identical, to logical reference functions. The request, execution, fault handling, and completion phases of physical reference mode operations are similar to the logical reference mode counterparts.

See the function summary in Appendix B for detailed descriptions of the operation of these functions.

The physical reference mode fUnctions are

oSm'PERIPHERAL SUBSYSTEM t-DDE ~

oREAD PRCCESSOR STATUS AND CLOCK o SEND TO PROCESSOR

o ALTER MAP AND SELECl' PHYSICAL SEG1ENI'.

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