Service manual

System Overview 1-79
Figure 1–35 is a drawing of the location of the H-switch power manager (HPM).
For a functional description of the HPM, see Section 1.8.6. In GS80 and GS160
systems with only one system box the HPM is not present. In all other system
configurations that require the hierarchical switch an HPM is present. The
module jumpers and LEDs are as follows.
Jumpers
The module has three two-position jumpers, none of which are normally
installed.
J2
Flash_Write_Inhibit - When installed, prevents the hardware from
writing to the flash memory.
J3
Force_FSL - When installed, causes the firmware to remain in the fail-
safe-loader (FSL) code after HPM reset.
J4
HS_CSB_ID0 - When installed, sets ID0 of the microprocessor’s CSB
address field to a 1.
LEDs
The module has two LEDs:
DC OK LED
(green)
On (normal)
Off
Indicates on-board +3.3V and +5V are good
On-board voltages not good
Reset/Initialize
LED (yellow)
On
Off (normal)
HPM is in the initialize or reset state
HPM configured, tested, and ready for
operation
LEDs are visible only when the H-switch EMI cover over it is removed.