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C167CS Datasheet(PDF) 227 Page - Infineon Technologies AG |
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C167CS Datasheet(HTML) 227 Page - Infineon Technologies AG |
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227 / 517 page  C167CS Derivatives The External Bus Interface User’s Manual 9-39 V2.0, 2000-07 Visible Mode The C167CS can mirror on-chip access cycles to its XBUS peripherals so these accesses can be observed or recorded by the external system. This function is enabled via bit VISIBLE in register SYSCON. Accesses to XBUS peripherals also use the EBC. Due to timing constraints the address bus will change for all accesses using the EBC. Note: As XBUS peripherals use demultiplexed bus cycles, the respective address is driven on PORT1 in visible mode, even if the external system uses MUX buses only. If visible mode is activated, accesses to on-chip XBUS peripherals (including control signals RD, WR, and BHE) are mirrored to the bus interface. Accesses to internal resources (program memory, IRAM, GPRs) do not use the EBC and cannot be mirrored to outside. If visible mode is deactivated, however, no control signals (RD, WR) will be activated, i.e. there will be no valid external bus cycles. Note: Visible mode can only work if the external bus is enabled at all. |
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