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21555 Non-Transparent PCI-to-PCI Bridge User Manual 75
Initialization Requirements
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
-Swap Insertion and Removal
A8068-01
LOCAL_PCI_RST# = Deasserted AND
HEALTHY# = Asserted
Switch = Unlatched
Switch = Latched
Switch =
UnLatched
Switch =
Latched
Software clears INS
1 H/W Connected
Switch =
UnLatched
Switch =
Latched
Switch = Latched
LOCAL_PCI_RST#
Asserted (anytime)
0 H/W Disconnected
Board (and HS_CSR)
Invisible via PCI
INS = 0 (Armed)
EXT = 0 (Not Armed)
LOO = Initially 0
LED = LOO
EIM = Initially 0
ENUM# = Z
4b Insertion
INS = 0 (Armed) DETECT
EXT = 1
LOO =1/0
LED = LOO
EIM = 1/0
ENUM# = EIM
2a INS ENUM#
INS = 1
EXT = 0 (Not Armed)
LOO = 1/ 0
LED = LOO
EIM = 1/ 0
ENUM# = EIM
Switch = Unlatched
3 Installed
INS = 0 (Not Armed)
EXT = 0 (Armed)
LOO = 1/ 0
LED = LOO
EIM = 1/ 0
ENUM# = Z
2b Extraction
INS = 1 DETECT
EXT = 0 (Armed)
LOO = 1/ 0
LED = LOO
EIM = 1/ 0
ENUM# = EIM
Switch = Latched
Software clears EXT
Switch = Unlatched
INS = 0 (Not Armed)
EXT = 1
LOO = 1/ 0
LED = LOO
EIM = 1/ 0
ENUM# = EIM
LOCAL_PCI_RST# asserted
at any time and at any state
puts the interface in State 0
4a EXT ENUM#
INS = 0 (Armed)
EXT = 0 (Not Armed)
LOO = 1/ 0
LED = LOO
EIM = 1/ 0
ENUM# = Z
5 Extracted
Software
clears INS,
ENUM# may
go to Z
momentarily.
Software
clears EXT,
ENUM# may
go to Z
momentarily.