Signal Descriptions

A.2.3 Through-board signal connections

The signals on the pins labeled E[31:0] are cross-connected between the plug and socket so that the signals are rotated through the stack in groups of four. For example, the first block of four are connected as shown in Table A-2.

Table A-2 Signal cross-connections (example)

Plug

 

Socket

 

 

 

E0

connects to

E1

 

 

 

E1

connects to

E2

 

 

 

E2

connects to

E3

 

 

 

E3

connects to

E0

 

 

 

For details about the signal rotation scheme, see System bus signal routing on page 3-15.

The signals on the pins labeled F[31:0] are connected so that pins on the socket are connected to the corresponding pins on the plug.

The signals on G[15:8] and G[5:0] are connected so that pins on the socket are connected to the corresponding pins on the plug.

Pins G[7:6] carry the JTAG TDI and TDO signals. The signal TDO is routed through devices on each baord as it passes up through the stack (see JTAG signals on page 3-24).

A-6

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