Power and Clocking
Table 8-9. GPIO Reset Timing Specifications
Symbol | Description | Min | Typical | Max |
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tA_GP[1] | Minimum assert time of GP[1]1 in 3.6864 MHz input clock cycles | 4 cycles | — | — |
tDGP_OUT_A | Delay between GP[1] Asserted and nRESET_OUT Asserted in | 6 cycles | — | 8 cycles |
3.6864 MHz input clock cycles | ||||
tDGP_OUT | Delay between nRESET_OUT asserted and nRESET_OUT | 5 ∝s | — | 28 ∝s |
deasserted, Run or Turbo Mode2 | ||||
tDGP_OUT_F | Delay between nRESET_OUT asserted and nRESET_OUT | 5 ∝s | — | 380 ∝s |
3 | ||||
| deasserted, during Frequency Change Sequence |
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NOTES:
1.GP[1] is not recognized as a reset source again until configured to do so in software. Software should check the state of GP[1] before configuring it as a Reset to ensure no spurious reset is generated.
2.Time is 512*N Processor Clock Cycles plus as many as 4 cycles of the 3.6864 MHz input clock.
3.Time during the Frequency Change Sequence depends on the state of the PLL Lock Detector at the assertion of GPIO Reset. The Lock Detector has a maximum time of 350 us plus synchronization.
8.5.6Sleep Mode Timing
Sleep Mode is internally asserted, and asserts the nRESET_OUT and PWR_EN signals. The sequence indicated in Figure
Figure 8-4. Sleep Mode Timing
tA_GP[x]
GP[x]
PWR_EN
VCC
nVDD_FAULT
nRESET_OUT
tD_PWR_F tD_PWR_R
tDSM_VCC
tD_FAULT
tDSM_OUT
Note: nBATT_FAULT must be high or PXA250 will not exit Sleep Mode
Table 8-10. Sleep Mode Timing Specifications (Sheet 1 of 2)
Symbol | Description | Min | Typical | Max |
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tA_GP[x} | Assert Time of GPIO Wake up Source (x=[15:0]) | 91.6 ∝s | — | — |
tD_PWR_F | Delay from nRESET_OUT asserted to PWR_EN deasserted | 61 ∝s | — | 91.6 ∝s |
tD_PWR_R | Delay between GP[x] asserted to PWR_EN asserted | 30.5 ∝s | — | 122.1 ∝s |
tDSM_VCC | Delay between PWR_EN asserted and VCC stable | — | — | 10 ms |
PXA250 and PXA210 Applications Processors Design Guide |