diff options
Diffstat (limited to 'import/chips/p9/procedures/hwp/lib/p9_common_poweronoff.H')
| -rw-r--r-- | import/chips/p9/procedures/hwp/lib/p9_common_poweronoff.H | 66 |
1 files changed, 65 insertions, 1 deletions
diff --git a/import/chips/p9/procedures/hwp/lib/p9_common_poweronoff.H b/import/chips/p9/procedures/hwp/lib/p9_common_poweronoff.H index 7adf1cf4..33a5bcc8 100644 --- a/import/chips/p9/procedures/hwp/lib/p9_common_poweronoff.H +++ b/import/chips/p9/procedures/hwp/lib/p9_common_poweronoff.H @@ -42,7 +42,71 @@ enum powerOperation_t POWER_ON_VDD = 0x1, POWER_OFF_VDD = 0xFE }; -} + + + +// For SBE, the initial power-on times are not overly time critical so they are +// hardcoded for the delay necessary when running with the fastest nest (2.4GHz). +// When these same values are used with slower nest frequencies, the delays will +// get longer (more conservative). +// +// For istep 15, the delay settings are computed based on the setting of +// ATTR_FREQ_PB +// +// pfet_delay = (1/nest_frequency_mhz)*1000*4 (PPM clock period in ns) * +// 2^(15-pfet_delay_value). +// +// or +// +// pfet_delay +// 2^(15-pfet_delay_value) = ------------------------------ +// (1/nest_frequency_mhz)*1000*4 +// +// pfet_delay * nest_frequency_mhz +// 2^(15-pfet_delay_value = ------------------------------ +// 1000*4 +// +// ( pfet_delay * nest_frequency_mhz) +// 15-pfet_delay_value = log2( ------------------------------) +// ( 1000*4 ) +// +// ( pfet_delay * nest_frequency_mhz) +// pfet_delay_value = 15 - log2( ------------------------------) +// ( 1000*4 ) +// +// ( pfet_delay * nest_frequency_mhz) +// logexp = ( ------------------------------) +// ( 1000*4 ) +// +// = pfet_delay * nest_frequency_mhz / (1000 * 4) +// = pfet_delay * (nest_frequency_mhz / (1000 * 4)) +// = pfet_delay * (2400 / (1000 * 4)) +// = pfet_delay * (.6) +// +// For core delay of 250ns per step, logexp = 250 * .6 = 150 +// --> log2(150) = 8 (rounded up to next integer) +// -- > pfet_delay_value = 15 - 8 = 7 +// +// For EQ delay of 500ns per step, logexp = 500 * .6 = 300 +// --> log2(150) = 9 (rounded up to next integer) +// -- > pfet_delay_value = 15 - 9 = 6 + + +enum pfetDelays +{ + PFET_DELAY_POWERDOWN_EQ = 0x1, + PFET_DELAY_POWERDOWN_CORE = 0x1, +#ifndef PRODUCT_DEFAULT_PFET_DELAYS + PFET_DELAY_POWERUP_EQ = 0x1, + PFET_DELAY_POWERUP_CORE = 0x1 +#else + PFET_DELAY_POWERUP_EQ = 0x6, + PFET_DELAY_POWERUP_CORE = 0x7 +#endif +}; + + +} // namespace /// @typedef p9_common_poweronoff_FP_t /// function pointer typedef definition for HWP call support |
