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21555 Non-Transparent PCI-to-PCI Bridge User Manual 189
List of Registers
Table 124. CompactPCI Hot-Swap Capability Identifier and Next Pointer Register
Bit Name R/W Description
7:0 HS ECP ID R
Enhanced capabilities ID. Reads only as 06h to indicate that these are
CompactPCI Hot
-Swap registers.
7:0
HS NXT
PTR
R
Pointer to next set of ECP registers. Reads only as 0 to indicate that
these are the last ECP registers in this list.
Table 125. CompactPCI Hot-Swap Control Register (Sheet 1 of 2)
• Primary byte offset: EF:EEh
• Secondary byte offset: EF:EEh
Bit Name R/W Description
0 Reserved R Reserved. Read only as 0.
1 ENUM_MASK R/W
ENUM# Interrupt Mask.
• When 0, the 21555 asserts p_enum_l when an insertion or removal
event occurs.
• When 1, the 21555 does not assert p_enum_l.
• Reset value is 0
2 Reserved R Reserved. Read only as 0.
3 LED On/Off (LOO) R/W
LED On/Off (LOO) Control. Allows software control of the l_stat pin and
therefore the state of the LED.
• When 0, the 21555 tristates l_stat. When REM STAT is low, the
LED is off when the ejector handle is closed and on when the
ejector handle is open. When REM STAT is high, l_stat is not
tristated but continues to be driven by the 21555 (LED is off).
• When 1, the 21555 drives l_stat high and the LED is forced on.
• Reset value is 0
Offsets HS ECP ID HS Next Pointer
Primary byte ECh EDh
Secondary byte ECh EDh