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MPC8313ECVRGDDB 数据表(PDF) 48 Page - Freescale Semiconductor, Inc |
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MPC8313ECVRGDDB 数据表(HTML) 48 Page - Freescale Semiconductor, Inc |
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48 / 100 page  MPC8313E PowerQUICC™ II Pro Processor Hardware Specifications, Rev. 2.1 48 Freescale Semiconductor Enhanced Local Bus 11.2 Local Bus AC Electrical Specifications Table 46 describes the general timing parameters of the local bus interface. Figure 36 provides the AC test load for the local bus. Figure 36. Local Bus AC Test Load Table 46. Local Bus General Timing Parameters Parameter Symbol1 Min Max Unit Notes Local bus cycle time tLBK 15 — ns 2 Input setup to local bus clock tLBIVKH 7— ns 3, 4 Input hold from local bus clock tLBIXKH 1.0 — ns 3, 4 LALE output fall to LAD output transition (LATCH hold time) tLBOTOT1 1.5 — ns 5 LALE output fall to LAD output transition (LATCH hold time) tLBOTOT2 3— ns 6 LALE output fall to LAD output transition (LATCH hold time) tLBOTOT3 2.5 — ns 7 LALE output rise to LCLK negative edge tLALEHOV —3.0 ns LALE output fall to LCLK negative edge tLALETOT1 –1.5 — ns 5 LALE output fall to LCLK negative edge tLALETOT2 –5.0 — ns 6 LALE output fall to LCLK negative edge tLALETOT3 –4.5 — ns 7 Local bus clock to output valid tLBKHOV —3 ns 3 Local bus clock to output high impedance for LAD tLBKHOZ —4 ns 8 Notes: 1. The symbols used for timing specifications follow the pattern of t(first two letters of functional block)(signal)(state)(reference)(state) for inputs and t(first two letters of functional block)(reference)(state)(signal)(state) for outputs. For example, tLBIXKH1 symbolizes local bus timing (LB) for the input (I) to go invalid (X) with respect to the time the tLBK clock reference (K) goes high (H), in this case for clock one (1). 2. All timings are in reference to falling edge of LCLK0 (for all outputs and for LGTA and LUPWAIT inputs) or rising edge of LCLK0 (for all other inputs). 3. All signals are measured from NVDD/2 of the rising/falling edge of LCLK0 to 0.4 × NVDD of the signal in question for 3.3-V signaling levels. 4. Input timings are measured at the pin. 5.tLBOTOT1 and tLALETOT1 should be used when RCWH[LALE] is not set and the load on LALE output pin is at least 10 pF less than the load on LAD output pins. 6.tLBOTOT2 and tLALETOT2 should be used when RCWH[LALE] is set and the load on LALE output pin is at least 10 pF less than the load on LAD output pins. 7.tLBOTOT3 and tLALETOT3 should be used when RCWH[LALE] is set and the load on LALE output pin equals to the load on LAD output pins. 8. For purposes of active/float timing measurements, the Hi-Z or off state is defined to be when the total current delivered through the component pin is less than or equal to the leakage current specification. Output Z0 = 50 Ω NVDD/2 RL = 50 Ω |
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