Texas Instruments PCI2250, User Manual, Page: 15 / 28

PCI2250 Mode Select Pins
4-3 Board Configuration
4.2 PCI2250 Mode Select Pins
The PCI2250 has three modes of operation based on the value of the mode
select pins MS0 (J6-2) and MS1 (J5-2). Table 4–2 shows the jumper settings
for the different modes of operation.
Table 4–2. Mode Select Jumper Settings
J6 J5 P_MFUNC S_MFUNC Mode
2–3 2–3 HS_ENUM HS_SWITCH TI hot-swap
2–3 1–2 P_CLKRUN S_CLKRUN TI clock run
1–2 2–3 P_LOCK S_LOCK Intel B2 support
1–2 1–2 P_LOCK S_LOCK Intel B3 support
4.2.1 Clock Run Mode
When the PCI2250 is in clock run mode, jumpers J1 and J7 should not be
jumpered. The clock run signals can be pulled directly from pin 2 of the jumper
headers.
4.2.2 CompactPCI

Hot Swap
When hot-swap mode is selected, jumpers J1 and J7 should have a jumper
between pins 2 and 3, routing the multifunction pins to the CompactPCI test
points.
4.2.3 Intel

Mode
When Intel mode is selected, jumpers J1 and J7 should have a jumper
between pins 1 and 2, routing the multifunction pins to the LOCK pins on the
connectors.