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TMS320F2811 数据表(PDF) 104 Page - Texas Instruments |
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TMS320F2811 数据表(HTML) 104 Page - Texas Instruments |
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104 / 173 page  Electrical Specifications 104 April 2001 − Revised July 2007 SPRS174O 6.15.2 Output Clock Characteristics Table 6−8. XCLKOUT Switching Characteristics (PLL Bypassed or Enabled)†‡ No. PARAMETER MIN TYP MAX UNIT C1 tc(XCO) Cycle time, XCLKOUT 6.67§ ns C3 tf(XCO) Fall time, XCLKOUT 2 ns C4 tr(XCO) Rise time, XCLKOUT 2 ns C5 tw(XCOL) Pulse duration, XCLKOUT low H−2 H+2 ns C6 tw(XCOH) Pulse duration, XCLKOUT high H−2 H+2 ns C7 tp PLL lock time¶ 131 072tc(CI) ns † A load of 40 pF is assumed for these parameters. ‡ H = 0.5tc(XCO) § The PLL must be used for maximum frequency operation. ¶ This parameter has changed from 4096 XCLKIN cycles in the earlier revisions of the silicon. C4 C3 XCLKOUT (see Note B) XCLKIN C5 C9 C10 C1 C8 C6 (see Note A) NOTES: A. The relationship of XCLKIN to XCLKOUT depends on the divide factor chosen. The waveform relationship shown in Figure 6−10 is intended to illustrate the timing parameters only and may differ based on configuration. B. XCLKOUT configured to reflect SYSCLKOUT. Figure 6−10. Clock Timing 6.16 Reset Timing Table 6−9. Reset (XRS) Timing Requirements† MIN NOM MAX UNIT tw(RSL1) Pulse duration, stable XCLKIN to XRS high 8tc(CI) cycles tw(RSL2) Pulse duration, XRS low Warm reset 8tc(CI) cycles tw(WDRS) Pulse duration, reset pulse generated by watchdog 512tc(CI) cycles td(EX) Delay time, address/data valid after XRS high 32tc(CI) cycles tOSCST‡ Oscillator start-up time 1 10 ms tsu(XPLLDIS) Setup time for XPLLDIS pin 16tc(CI) cycles th(XPLLDIS) Hold time for XPLLDIS pin 16tc(CI) cycles th(XMP/MC) Hold time for XMP/MC pin 16tc(CI) cycles th(boot-mode) Hold time for boot-mode pins 2520tc(CI)§ cycles † If external oscillator/clock source are used, reset time has to be low at least for 1 ms after VDD reaches 1.5 V. ‡ Dependent on crystal/resonator and board design. § The boot ROM reads the password locations. Therefore, this timing requirement includes the wakeup time for flash. See the TMS320x281x Boot ROM Reference Guide (literature number SPRU095) and TMS320x281x System Control and Interrupts Reference Guide (literature number SPRU078) for further information. |
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