Board Control And Status Registers (Bcsr); Write/Read Control Register 0 - EKF SC2-PRESTO CompactPCI User Manual

User Guide • SC2-PRESTO • CompactPCI
Beside the continuous measuring of temperatures and voltages the LM87 may compare these values
against programmable upper and lower boundaries. As soon as a measurement violates the allowed
value range, the LM87 can request an interrupt via the GPI13 input of the QM87 PCH (which may
result in a system management interrupt).

Board Control and Status Registers (BCSR)

A set of board control and status registers allow to program special features on the SC2-PRESTO:
• Assert a full reset
• Control activity of front panel reset and power event button
• Program time-outs and trigger a watchdog
• Get access to two LEDs in the front panel
• Get power fail and watchdog status of last board reset
The register set consists of five registers located on the SMBus at Device ID=0x5c on the following
addresses:
• 0xA0: CMD_CTRL0_WR: Write to Control Register 0 (Write-Only)
• 0xA1: CMD_CTRL0_RD: Read from Control Register 0 (Read-Only)
• 0xB0: CMD_STAT0_WR: Write to Status Register 0 (Write-Clear)
• 0xB1: CMD_STAT0_RD: Read from Status Register 0 (Read-Only)
• 0xB2: CMD_STAT1_WR: Write to Status Register 1 (Write-Clear)
• 0xB3: CMD_STAT1_RD: Read from Status Register 1 (Read-Only)
• 0xC1: CMD_PLDREV_RD: Read from PLD Revision Register (Read-Only)
To prevent misfunction accesses to the registers should be done by SMBus "Byte Data" commands.
Further writes to read-only or reads to write-only registers should be omitted.

Write/Read Control Register 0

Write: SMBus Address 0xA0
Read: SMBus Address 0xA1
Bit
7 GPLED
0=Green part of the front panel LED GP is off (Default)
1=Green part of the front panel LED GP is on
6 FPDIS
0=Enable the front panel handle switch (Default)
1=Disable the front panel handle switch
5 FERP#
0=The front panel handle switch generates a power event (Default)
1=The front panel handle switch generates a system reset
© EKF
®
Serial CPU Board • Intel® Core
Description CMD_CTRL0
-52-
TM
4xxx Processor
Default after reset: 0x00
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