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3 • Switches and LEDs
3.1 Switches
Table 3-1 IPN250RTMA P7 Switch Assignments
P7
Function
Switch
COM12_FRONT~
1
2
BOOT_FWH~
HDMI_SE2
3
JTAG_GPU~
4
5
TESTMODE
SYSCON~
6
NVMRO
7
DEDI_SEL_SW
8
System Controller
26 IPN250RTM
DIP switches are used on the IPN250RTM to select particular functionality, as
described in Table 3-1 (COMs, JTAG, System Controller, etc) and
switch configuration).
LINK
Refer to
Figure 1-1
for the location of the P7 switch bank.
NOTE
Links on headers P7 and P8 are no longer operable.
3.1.1 Miscellaneous Signals
Closing a switch takes the corresponding function to the low (GND) state.
Description
Closed = COM ports on IPN250 front panel are active
Open = Rear COM ports (on IPN250RTM) are active
Leave open (= IPN250 has Firmware Hub Boot disabled)
Closed = DVI selected
Open = HDMI selected
Closed = GPU enabled for JTAG operation
Open = Normal operation
Reserved for future use
Closed = IPN250 associated with this RTM is System Controller
Open = IPN250 associated with this RTM is not System Controller
(see below)
Closed = All non-volatile memory in system write-enabled
Open = All non-volatile memory in system write-protected
(see below)
Closed = Dediprog programming of IPN250 selected
Open = Normal operation
The IPN250 associated with this RTM can be made System Controller via DIP
switches on the IPN250RTM, the backplane or the FABRTMP1.
CAUTION
Only set System Controller on one of the backplane, the IPN250RTM or the FABRTMP1 (more than
one may result in the incorrect payload board or multiple payload boards being set as System
Controller). Whichever is not used should have DIP switches/links set/left open.
CAUTION
A system should not contain more than one System Controller.
Table 3-2
(PCIe
Associated
LED
DS26
DS25
-
DS23
DS22
DS21
DS20
-
Publication No. IPN250RTM-HRM/2
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