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C161 Datasheet(PDF) 103 Page - Infineon Technologies AG |
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C161 Datasheet(HTML) 103 Page - Infineon Technologies AG |
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103 / 400 page  &3, ,QWHUUXSW DQG 7UDS )XQFWLRQV User’s Manual 5-21 1999-08 5.6 PEC Response Times The PEC response time defines the time from an interrupt request flag of an enabled interrupt source being set until the PEC data transfer being started. The basic PEC response time for the C161PI is 2 instruction cycles. Figure 5-5 Pipeline Diagram for PEC Response Time In the figure above the respective interrupt request flag is set in cycle 1 (fetching of instruction N). The indicated source wins the prioritization round (during cycle 2). In cycle 3 a PEC transfer “instruction” is injected into the decode stage of the pipeline, suspending instruction N+1 and clearing the source's interrupt request flag to '0'. Cycle 4 completes the injected PEC transfer and resumes the execution of instruction N+1. All instructions that entered the pipeline after setting of the interrupt request flag (N+1, N+2) will be executed after the PEC data transfer. Note: When instruction N reads any of the PEC control registers PECC7...PECC0, while a PEC request wins the current round of prioritization, this round is repeated and the PEC data transfer is started one cycle later. The minimum PEC response time is 3 states (6 TCL). This requires program execution from the internal code memory, no external operand read requests and setting the interrupt request flag during the last state of an instruction cycle. When the interrupt request flag is set during the first state of an instruction cycle, the minimum PEC response time under these conditions is 4 state times (8 TCL). Pipeline Stage Cycle 1 Cycle 2 Cycle 3 Cycle 4 FETCH N N + 1 N + 2 N + 2 DECODE N - 1 N PEC N + 1 EXECUTE N - 2 N - 1 N PEC WRITEBACK N - 3 N - 2 N - 1 N PEC Response Time 1 0 IR-Flag |
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