Emerson 752I 用户手册

 cPCI Functionality

752i User’s Manual

The Katana

752i implements an optional jumper, JP1 (see 

), 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. 

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). 

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.