Sundance SMT310Q - Manual (Page 12)

Version 2.1 Page 12 of 55 SMT310Q User Manual
4. Comports
The SMT310Q gives access to all six comports on each of the four TIM sites 3 . All of
these comports can be presented at an FMS connector on the rear of the carrier
card. The connectors are marked TxCy, where “x” indicates the TIM site (1–4) and
“y” the comport number (0–5). You can connect pairs of comports by plugging cables
into these FMS connectors. Details of the connections can be found in FMS Cabling.
As an alternative to cables you can use on-board connections that allow for a subset
of the possible topologies. These on-board connections are selected by means of
Quick Switches
, programmed from the Host. Figure 4 shows the possible
connections. When the SMT310Q comes out of reset, all the quick switches will be in
the 0 state.
There is a connection from the PCI interface to T1C3. This is enabled by default and
is intended for booting the system. The connection can be changed with the quick
switch controlled by bit D15 in the COM-SWITCH register. The two settings are:
0. Connect the Host Link to T1C3, and connect the C_BUF FMS connector to the
external buffered comport. This allows any of the remaining comports on sites
1—4 to be connected to the external buffered comport with an FMS cable.
In this state, the FMS connector for T1C3 must not be used.
1. Connect the Host Link to the external buffered comport and connect T1C3 to
the C_BUF FMS connector.
4.1
C_BUF
Bit D15 in the COM-SWITCH register determines the connection of the C_BUF
FMS connector (J15):
D15=0 C_BUF FMS is connected to the buffered comport. With jumper J7
fitted, C_BUF FMS will reset as an input. With J7 removed, C_BUF
FMS will reset as an output. See Figure 17.
D15=1 C_BUF FMS is connected to T1C3; this resets to an input.
D15 J7 fitted J7 removed
0 Connect C_BUF to an output comport . Connect C_BUF to an input comport .
1 Connect C_BUF to an output comport . Not to be used
3 Some TIMs do not implement all six possible comports.