21555 Hot-Swap Insertion And Removal - Intel 21555 User Manual

When the INS_STAT bit is cleared, the card is ready for normal operation. When l_stat continues
to be sampled low, that indicates that the ejector handle is closed (and the micro-switch is open),
meaning the card remains fully inserted. The 21555 enters the Normal Operation state.
Figure 12. 21555 Hot
LOCAL_PCI_RST# asserted
at any time and at any state
puts the interface in State 0
clears EXT,
ENUM# may
momentarily.
INS = 0 (Armed) DETECT
EXT = 1
LOO =1/0
LED = LOO
EIM = 1/0
ENUM# = EIM
21555 Non-Transparent PCI-to-PCI Bridge User Manual
Swap Insertion and Removal
-
LOCAL_PCI_RST#
Asserted (anytime)
Switch = Unlatched
Software
Switch = Latched
go to Z
Switch =
4b Insertion
UnLatched
Switch =
Latched
Switch = Latched
0 H/W Disconnected
Board (and HS_CSR)
Invisible via PCI
LOCAL_PCI_RST# = Deasserted AND
HEALTHY# = Asserted
1 H/W Connected
INS = 0 (Armed)
EXT = 0 (Not Armed)
LOO = Initially 0
LED = LOO
EIM = Initially 0
ENUM# = Z
Switch = Latched
2a INS ENUM#
INS = 1
EXT = 0 (Not Armed)
LOO = 1/ 0
LED = LOO
EIM = 1/ 0
ENUM# = EIM
Software clears INS
3 Installed
INS = 0 (Not Armed)
EXT = 0 (Armed)
LOO = 1/ 0
LED = LOO
EIM = 1/ 0
ENUM# = Z
Switch = Unlatched
4a EXT ENUM#
INS = 0 (Not Armed)
EXT = 1
LOO = 1/ 0
LED = LOO
EIM = 1/ 0
ENUM# = EIM
Software clears EXT
5 Extracted
INS = 0 (Armed)
EXT = 0 (Not Armed)
LOO = 1/ 0
LED = LOO
EIM = 1/ 0
ENUM# = Z
Initialization Requirements
Switch = 2b Extraction
UnLatched
INS = 1 DETECT
EXT = 0 (Armed)
LOO = 1/ 0
Switch =
LED = LOO
Latched
EIM = 1/ 0
ENUM# = EIM
Software
clears INS,
ENUM# may
go to Z
momentarily.
Switch = Unlatched
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