Xerox 4540 Service Manual - Page 249
Power-Off Sequence, Power-Off Sequence Timing Parameters, t_ NEXT_RAIL
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FIGURE E-2 Power-Off Sequence PS[0,1,2]_FAIL PS[0,1,2]_PRESENT_L MAIN_HOTSWAP_GOOD Any POWER_GOOD signal SOUTH_RPWRON SOUTH_PWRON_L [1P2V, 1P5V]_ENABLE ALL_POWERGOOD (Reset) PROC[0,1]_CORE_ENABLE [1P8V, 2P5V, DDR]_ENABLE [3P3V, 5V]_ENABLE MINUS12V_ENABLE_L HS_ENABLE PS[0,1,2]_ENABLE_L POWER OFF CONDITION t_NEXT_RAIL Immediate Reset t_NEXT_RAIL t_NEXT_RAIL t_NEXT_RAIL t_NEXT_RAIL t_NEXT_RAIL t_NEXT_RAIL TABLE E-2 Power-Off Sequence Timing Parameters Symbol t_NEXT_RAIL (fault condition) t_ NEXT_RAIL (normal powerdown) Parameter Value (in ms) Delay from one rail Enable deassertion to next rail 1 ms Enable deassertion after a fault condition. Delay from one rail Enable deassertion to next rail 20 ms Enable deassertion after a power-down initiated by the Host/SP. Appendix E Power Reset and Initialization Sequences E-5
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