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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MPC8548E датащи(PDF) 52 Page - Freescale Semiconductor, Inc |
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MPC8548E датащи(HTML) 52 Page - Freescale Semiconductor, Inc |
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52 / 144 page  MPC8548E PowerQUICC™ III Integrated Processor Hardware Specifications, Rev. 6 52 Freescale Semiconductor JTAG 12.1 JTAG DC Electrical Characteristics Table 43 provides the DC electrical characteristics for the JTAG interface. 12.2 JTAG AC Electrical Specifications Table 44 provides the JTAG AC timing specifications as defined in Figure 30 through Figure 32. Table 43. JTAG DC Electrical Characteristics Parameter Symbol1 Min Max Unit High-level input voltage VIH 2OVDD + 0.3 V Low-level input voltage VIL –0.3 0.8 V Input current (VIN 1 = 0 V or V IN = VDD)IIN —±5 μA High-level output voltage (OVDD = min, IOH = –2 mA) VOH 2.4 — V Low-level output voltage (OVDD = min, IOL = 2 mA) VOL —0.4 V Note: 1. Note that the symbol VIN, in this case, represents the OVIN. Table 44. JTAG AC Timing Specifications (Independent of SYSCLK)1 Parameter Symbol2 Min Max Unit Notes JTAG external clock frequency of operation fJTG 0 33.3 MHz — JTAG external clock cycle time t JTG 30 — ns — JTAG external clock pulse width measured at 1.4 V tJTKHKL 15 — ns — JTAG external clock rise and fall times tJTGR & tJTGF 02 ns 6 TRST assert time tTRST 25 — ns 3 Input setup times: Boundary-scan data TMS, TDI tJTDVKH tJTIVKH 4 0 — — ns 4 Input hold times: Boundary-scan data TMS, TDI tJTDXKH tJTIXKH 20 25 — — ns 4 Valid times: Boundary-scan data TDO tJTKLDV tJTKLOV 4 4 20 25 ns 5 Output hold times: Boundary-scan data TDO tJTKLDX tJTKLOX 30 30 — — ns 5 |
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