The extraction process is triggered by the HS_SWITCHN input being asserted. This causes the HS_ENUMN output
to be asserted. Sometime later, the PCI Master reads the hot-swap register to see why HS_ENUMN is active. In this
case, bit 22 will be active, indicating an extraction request. The PCI Master clears the extraction status bit, causing
HS_ENUMN to become inactive. As the board is removed, HS_BDSELN becomes active, causing the internal reset to
be asserted.
clk
ad[31:0]
HS
HS
cben[3:0]
A
0
B
0
framen
devseln
irdyn
trdyn
dp_start
dp_done
hs_bdseln
hs_switchn
hs_powgoodn
hs_powfailn
hs_enumn
hs_ledn
hs_healthyn
rst_outn
Figure 6-57 · Hot-Swap Extraction Sequence
104
v4.0
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