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C167CS Datasheet(PDF) 228 Page - Infineon Technologies AG |
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C167CS Datasheet(HTML) 228 Page - Infineon Technologies AG |
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228 / 517 page  C167CS Derivatives The External Bus Interface User’s Manual 9-40 V2.0, 2000-07 9.8.2 External Accesses to XBUS Peripherals The on-chip XBUS peripherals of the C167CS can be accessed from outside via the external bus interface under certain circumstances. In emulation mode the XBUS peripherals are controlled by the bondout-chip. During normal operation this external access is accomplished selecting the XPER-Share mode. XPER-Share Mode The C167CS can share its on-chip XBUS peripherals with other (external) bus masters, i.e. it can allow them to access its X-Peripherals while it is in hold mode. This external access is enabled via bit XPERSHARE in register SYSCON and is only possible while the host controller is in hold mode. During XPER-Share mode the C167CS’s bus interface inverts its direction so the external master can drive address, control, and data signals to the respective peripheral. This can be used e.g. to install a mailbox memory in a multi-processor system. Note: When XPER-Share mode is disabled no accesses to on-chip XBUS peripherals can be executed from outside. |
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