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Hot Swap: cPCI Functionality
Katana
®
752i User’s Manual 10006024-04
12-2
CPCI FUNCTIONALITY
The Katana
®
752i implements an optional jumper, JP1 (see Fig. 2-4), which can enable or dis-
able the board’s cPCI functionality. By default, cPCI is enabled (jumpers placed on JP1, pins
1—2 and pins 7—8).
The jumper settings also can prevent the cPCI_RST signal from resetting the board. This
allows system designers the flexibility to choose whether or not the Katana
®
752i uses the
cPCI reset signal (from the backplane). When pins 1 and 2 of JP1 are jumpered (default), the
cPCI_RST signal is enabled. With no jumper installed, the Katana
®
752i ignores the
cPCI_RST signal.
HOT SWAP LED AND EJECTOR SWITCH CONTROL
The specific operation of the Hot Swap LED and Ejector Switch is determined by whether or
not the Katana
®
752i’s cPCI functionality is enabled (see previous section).
cPCI Hot Swap
When cPCI functionality is enabled (this is the default condition, where jumpers are placed
on JP1, pins 1—2 and pins 7—8), the Katana
®
752i uses Hot Swap logic internal to the
MV64460 system controller.
The Hot Swap logic functions as follows when a board is inserted into a slot:
1 The inserted board gets power from Early Power, and its reset is asserted from Local PCI
PCI0__RSTn. The hardware turns on the Hot Swap LED.
2 The local PCI PCI0_RSTn signal is de-asserted, causing the Hot Swap LED to turn off,
indicating that the operator may lock the ejector handle.
3 After the operator locks the handle, the PCI0_HS signal goes high, indicating that the board
is inserted and locked.
4 INS bit is set and PCI0_ENUMn is asserted, notifying the Hot Swap software that a board has
been inserted.
5 System Hot Swap software detects PCI0_ENUMn assertion and checks the INS bits in all Hot
Swap-compliant boards. It identifies the inserted board and clears the INS bit (by writing a
value of one).
6 The MV64460 system controller acknowledges the system software by stopping the
assertion of the PCI0_ENUMn pin. Now, software may reconfigure all the boards.