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000-0046140-111
Page 142 of 169
SLG46140
The VREF output pin driving signal can precede POR output signal going high by 3
s - 5
s. The POR signal going high indicates
the mentioned powerup sequence is complete.
Note: The maximum voltage applied to any PIN should not be higher than the VDD level. There are ESD Diodes between PIN –
> VDD and PIN –> GND on each PIN. So if the input signal applied to PIN is higher than VDD, then current will sink through the
diode to VDD. Exceeding VDD results in leakage current on the input PIN, and VDD will be pulled up, following the voltage on
the input PIN.There is no effect from input pin when input voltage is applied at the same time as VDD.
22.5 Power Down
During powerdown, macrocells in SLG46140 are powered off after VDD falling down below Power Off Threshold. Please note
that during a slow rampdown, outputs can possibly switch state during this time.
22.6 POR Register Settings
22.7 External reset
The SLG46140 has an optional External Reset function on Pin2. It allows to reset the chip while powered on.
Pin2 must be configured as Digital Input reg<762:761> and function Reset must be enabled also, reg<1002>: 0 - disabled, 1 -
enabled. Unlike POR, External Reset affects only GPI, LUTs, DLY, RC OSC, DFFs, Latches, Pipe Delay, Matrix and GPO. While
NVM remains its previous state, see
to
Figure 95. Power Down
Table 81. POR Register Settings
Signal Function
Register Bit
Address
Register Definition
Bypass V
DD
to 1.8 V
device. Only when power
is 1.8 V
<1003>
0: 1.8 V use regulator
1: Bypass VDD as 1.8 V device power
Input pad enable to core
nRST delay 500
s
enable
<1004>
0: Delay 4
s
1: Delay 500
s
POR Auto Power Detect
<1005>
0: Enable
1: Disable
Not guaranteed output state
VDD (V)
Time
1.6 V
1.15 V
2 V
1 V
1.2 V VREF Out Signal
Содержание GreenPAK SLG46140
Страница 102: ...000 0046140 111 Page 101 of 169 SLG46140 14 1 Initial Polarity Operations Figure 54 DFF Polarity Operations ...
Страница 103: ...000 0046140 111 Page 102 of 169 SLG46140 Figure 55 DFF Polarity Operations with nReset ...
Страница 104: ...000 0046140 111 Page 103 of 169 SLG46140 Figure 56 DFF Polarity Operations with nSet ...