Milkymist One Power On Off Sequence

Normal RC2 Power On Off Sequence

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  Booted: A manuscript of illustrating Milkymist One RC2 0x1a board. It is collected from Milkymist One RC2 Collective Waveforms Captured While Power On/Off.

Known bug on H/W and Solutions

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  Un-booted: MM1 RC2 0x2c board; CH1 = DONE(triggered source), CH2 = PROGRAM_B; triggered at rising edge by switching on an AC 110V from the input of AC(EU) DC adapter WN10B-050; without reset ic, no 82nF besides R60, power cycling : On(D2 lights flash) -> Off -> On(D2 slight lights eventually), Monitor Milkymist logo doesn't show up. 100m sec/div

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  Un-booted: MM1 RC2 0x2c board; CH1 = DONE(triggered source), CH2 = PROGRAM_B; triggered at rising edge by switching on an AC 110V from the input of AC(EU) DC adapter WN10B-050; with reset ic connected to PROGRAM_B, no 82nF besides R60, power cycling : On(D2 lights flash) -> Off -> On(D2 lights off eventually), Monitor Milkymist logo shows up but doesn't enter Flicknoise control panel screen.100m sec/div

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  Booted: MM1 RC2 0x2c board; CH1 = DONE(triggered source), CH2 = PROGRAM_B; triggered at rising edge by switching on an AC 110V from the input of AC(EU) DC adapter WN10B-050; with reset ic connected to PROGRAM_B, no 82nF besides R60, power cycling : On(D2 lights flash) -> Off -> On(D2 lights off eventually), Monitor Milkymist logo shows up and enters Flicknoise control panel screen.250m sec/div

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  Un-booted: MM1 RC2 0x2c board; CH1 = DONE(triggered source), CH2 = U9 RP#; triggered at rising edge by switching on an AC 110V from the input of AC(EU) DC adapter WN10B-050; with reset ic connected to PROGRAM_B, No 82nF, power cycling : On(D2 slight flash) -> Off -> On(D2 lights On eventually), Monitor Milkymist logo shows up but doesn't enter Flicknoise control panel screen.100m sec/div

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  Booted: MM1 RC2 0x2c board; CH1 = DONE(triggered source), CH2 = U9 RP#; triggered at rising edge by switching off an AC 110V from the input of AC(EU) DC adapter WN10B-050; with reset ic connected to PROGRAM_B, no 82nF besides R60, power cycling : On(D2 lights flash) -> Off -> On(D2 lights off eventually), Monitor Milkymist logo shows up and also enters Flicknoise control panel screen.250m sec/div

Usefull pin of FPGA Configuration

PROGRAM_B : It's a dedicated input pin for Active-Low asynchronous full-chip reset. When asserted
 Low for 500 ns or longer, forces the FPGA to restart its configuration process by clearing 
 configuration memory and resetting the DONE and INIT_B pins after PROGRAM_B returns High. 
During Configuration: Must be High 
 to allow configuration to start. 
After Configuration: Drive PROGRAM_B Low and release to reprogram FPGA. Hold PROGRAM_B to force the 
 FPGA I/O pins into High-Z, allowing direct programming access to SPI flash PROM pins.

NOR FLASH Reset Specifications

Asserting RP# during a system reset is important with automated program/erase devices because systems typically expect to read from flash memory when coming out of reset. If a CPU reset occurs without a flash memory reset, proper CPU initialization may not occur. This is because the flash memory may be providing status information, instead of array data as expected. Connect RP# to the same active low reset signal used for CPU initialization. Also, because the device is disabled when RP# is asserted, it ignores its control inputs during power-up/down. Invalid bus conditions are masked, providing a level of memory protection. See Reset Operation Waveforms in JS28F256J3F105.

1, tVCCPH: Min. 300us, VCC Power valid to RP# de-assertion (high)
2, tPLPH: Min. 100ns, RP# pulse width low

Links

Operating Voltages of Milkymist One's Key Parts

Milkymist One RC2 Collective Waveforms Captured While Power On Off

Reset IC with 20us delay

Xilinx UG380 Spartan-6 FPGA Configuration User Guide

Spartan-6 - Why is INIT_B low after power-on?

Xilinx UG394 Spartan-6 FPGA Power Management User Guide