User`s guide

Appendix A • 55
The flow begins from card insertion. This occurs when reset: either p_rst_l
or s_rst_in_l, is asserted and l_stat is sampled high. In the Local Reset
state, all outputs are tristated, except the secondary reset output, s_rst_l.
The state of the micro-switch controls the state of the LED in the Local
Reset state. As long as the micro-switch is closed in this state, the LED is
on; the 21555 do not drive l_stat in this state.
When both of the reset input signals are de-asserted, the 21555 enters the
Serial Preload state. In this state, the 21555 responds to all transactions
with target retry. As long as the micro-switch is closed in this state, the LED
is on. When the micro-switch closes, l_stat is pulled low and the LED
turns off. The Hot-Swap Control register is still not accessible from the
primary side, but can be accessed from the secondary side. Therefore, it is
possible to control the LOO bit, and force the LED on, from the secondary
side.
The 21555 enters the Signal Insertion state from the Serial Preload state
when the following conditions are satisfied:
• Serial preload is complete.
• Primary Lockout Reset Value bit cleared.
• Ejector handle is closed (micro-switch opens, and l_stat is sampled
low).
The cPCI-6765 has now been completely seated and the local initialization
is complete. It’s ready for host configuration and initialization. The 21555
sets the INS_STAT bit and asserts p_enum_l to the host. Upon detecting
p_enum_l asserted the host processor initializes the card. When the
initialization is complete, the host clears the INS_STAT bit. 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 cPCI-6765 remains
fully inserted. The 21555 enters the Normal Operation state.