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AM3874 Datasheet(PDF) 191 Page - Texas Instruments |
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AM3874 Datasheet(HTML) 191 Page - Texas Instruments |
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191 / 361 page  ( ) C C 1 2 CL C C 1 2 = + AUXOSC_MXI/ AUX_CLKIN AUXOSC_MXO C1 C2 Crystal VSSA_AUXOSC Rd (Optional) AM3874, AM3871 www.ti.com SPRS695C – SEPTEMBER 2011 – REVISED DECEMBER 2013 Figure 7-8. Auxiliary Oscillator The load capacitors, C1 and C2 in the above pictures, should be chosen such that the below equation is satisfied. CL in the equation is the load specified by the crystal manufacturer. All discrete components used to implement the oscillator circuit should be placed as close as possible to the associated oscillator MXI, MXO, and VSS pins. Table 7-11. Input Requirements for Crystal Circuit on the Device Oscillator (DEVOSC) PARAMETER MIN TYP MAX UNIT Start-up time (from power up until oscillating at stable frequency) 4 ms Crystal Oscillation frequency(1) 20 20 30 MHz Parallel Load Capacitance (C1 and C2) 12 24 pF Crystal ESR 50 Ω Crystal Shunt Capacitance 5 pF Crystal Oscillation Mode Fundamental Only n/a If Ethernet not used ±200 If MII is used and Crystal Frequency Stability ±100 ppm RGMII, RMII not used If RGMII, or RMII used ±50 (1) 20-MHz DEV clock is required for all bootmodes other than Fast XIP. For more detailed information on boot modes, see the ROM Code Memory and Peripheral Booting chapter of the AM387x Sitara™ ARM Processors Technical Reference Manual (Literature Number: SPRUGZ7). Table 7-12. Input Requirements for Crystal Circuit on the Auxiliary Oscillator (AUXOSC) PARAMETER MIN MAX UNIT Start-up time (from power up until oscillating at stable frequency) 4 ms Crystal Oscillation frequency 20 30 MHz Parallel Load Capacitance (C1 and C2) 12 24 pF Crystal ESR 50 Ω Crystal Shunt Capacitance 5 pF Crystal Oscillation Mode Fundamental Only n/a Crystal Frequency stability(1) ±50 ppm (1) Applies only when sourcing the HDMI or HDVPSS DAC clocks from the AUXOSC Copyright © 2011–2013, Texas Instruments Incorporated Power, Reset, Clocking, and Interrupts 191 Submit Documentation Feedback Product Folder Links: AM3874 AM3871 |
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