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13 miscellaneous, Miscellaneous – Intel OCPRF100 MP User Manual

Page 139

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OCPRF100 MP Server System Technical Product Specification
Revision 1.0

132

cifically, this bus connects the FPC and BMC. Also, there may be an SMM based device on the
bus and a cluster card connector based device.

On the FPC, this bus consists of the I2C_BACKUP_SCL and the I2C_BACKUP_SDA signals.

10.2.12.3 I

2

C Development Support Jumpers

Development support jumpers on the I

2

C buses are provided to isolate I

2

C devices. These jump-

ers must first be enabled by removing Resistor Pack RP3A4 and RP3A5 and adding all J3 jump-

ers. Once enabled, specific I

2

C devices/sections can be isolated by removing the jumpers.

In production, the jumper blocks are not stuffed.

10.2.13 Miscellaneous

10.2.13.1 Signal RESET_OUTPUTS_L

The RESET_OUTPUTS_L signal is used to enable the output latch. Immediately after the micro-
controller comes out of a hard reset, this signal goes to the deasserted (high) state. In this state,
the output latch is output disabled, but retains any states written to it. The microcontroller initial-
izes the latch with proper values before the RESET_OUTPUTS_L signal is asserted (low).