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AM6442...ALV 数据表(PDF) 212 Page - Texas Instruments |
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AM6442...ALV 数据表(HTML) 212 Page - Texas Instruments |
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212 / 244 page  Table 7-149. JTAG Timing Conditions (continued) PARAMETER MIN MAX UNIT td(Trace Mismatch Delay) Propagation delay mismatch across all traces 100 ps (1) Maximum propagation delay associated with the JTAG signal traces has a significant impact on maximum TCK operating frequency. It may be possible to increase the trace delay beyond this value, but the operating frequency of TCK must be reduced to account for the additional trace delay. Table 7-150. JTAG Timing Requirements see Figure 7-117 NO. MIN MAX UNIT J1 tc(TCK) Cycle time minimum, TCK 45.5(1) ns J2 tw(TCKH) Pulse width minimum, TCK high 0.4P(2) ns J3 tw(TCKL) Pulse width minimum, TCK low 0.4P(2) ns J4 tsu(TDI-TCK) Input setup time minimum, TDI valid to TCK high 4 ns tsu(TMS-TCK) Input setup time minimum, TMS valid to TCK high 4 ns J5 th(TCK-TDI) Input hold time minimum, TDI valid from TCK high 2 ns th(TCK-TMS) Input hold time minimum, TMS valid from TCK high 2 ns (1) The maximum TCK operating frequency assumes the following timing requirements and switching characteristis for the attached debugger. The operating frequency of TCK must be reduced to provide appropriate timing margin if the debugger exceeds any of these assumptions. • Minimum TDO setup time of 2.2 ns relative to the rising edge of TCK • TDI and TMS output delay in the range of -16.1 ns to 14.1 ns relative to the falling edge of TCK (2) P = TCK cycle time in ns Table 7-151. JTAG Switching Characteristics see Figure 7-117 NO. PARAMETER MIN MAX UNIT J6 td(TCKL-TDOI) Delay time minimum, TCK low to TDO invalid 0 ns J7 td(TCKL-TDOV) Delay time maximum, TCK low to TDO valid 14 ns TDO J2 J1 J4 TCK J5 TDI / TMS J3 J6 J7 J4 J5 Figure 7-117. JTAG Timing Requirements and Switching Characteristics AM6442, AM6441, AM6421, AM6412, AM6411 SPRSP56D – JANUARY 2021 – REVISED JULY 2022 www.ti.com 212 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated Product Folder Links: AM6442 AM6441 AM6421 AM6412 AM6411 |
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