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C161 Datasheet(PDF) 189 Page - Infineon Technologies AG |
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C161 Datasheet(HTML) 189 Page - Infineon Technologies AG |
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189 / 400 page  &3, 7KH([WHUQDO%XV ,QWHUIDFH User’s Manual 9-25 1999-08 Address Window Arbitration The address windows that can be defined within the C161PI’s address space may partly overlap each other. Thus e.g. small areas may be cut out of bigger windows in order to effectively utilize external resources, especially within segment 0. For each access the EBC compares the current address with all address select registers (programmable ADDRSELx and hardwired XADRSx). This comparison is done in four levels. Priority 1:The hardwired XADRSx registers are evaluated first. A match with one of these registers directs the access to the respective X-Peripheral using the corresponding XBCONx register and ignoring all other ADDRSELx registers. Priority 2:Registers ADDRSEL2 and ADDRSEL4 are evaluated before ADDRSEL1 and ADDRSEL3, respectively. A match with one of these registers directs the access to the respective external area using the corresponding BUS- CONx register and ignoring registers ADDRSEL1/3 (see figure below). Priority 3:A match with registers ADDRSEL1 or ADDRSEL3 directs the access to the respective external area using the corresponding BUSCONx register. Priority 4:If there is no match with any XADRSx or ADDRSELx register the access to the external bus uses register BUSCON0. Figure 9-11 Address Window Arbitration Note: Only the indicated overlaps are defined. All other overlaps lead to erroneous bus cycles. E.g. ADDRSEL4 may not overlap ADDRSEL2 or ADDRSEL1. The hardwired XADRSx registers are defined non-overlapping. Active Window Inactive Window BUSCON0 BUSCON1 BUSCON2 XBCON0 BUSCON3 BUSCON4 |
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