User Guide • PC3-ALLEGRO • CompactPCI
®
PlusIO CPU Board • Intel® i7-3xxx Processor
Board Control and Status Registers
A set of board control and status registers allow to program special features on the PC3-ALLEGRO:
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Assert a full reset
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Control activity of front panel reset and power event button
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Program time-outs and trigger a watchdog
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Get access to two LEDs in the front panel
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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:
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0xA0: CMD_CTRL0_WR: Write to Control Register 0 (Write-Only)
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0xA1: CMD_CTRL0_RD: Read from Control Register 0 (Read-Only)
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0xB0: CMD_STAT0_WR: Write to Status Register 0 (Write-Clear)
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0xB1: CMD_STAT0_RD: Read from Status Register 0 (Read-Only)
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0xB2: CMD_STAT1_WR: Write to Status Register 1 (Write-Clear)
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0xB3: CMD_STAT1_RD: Read from Status Register 1 (Read-Only)
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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.
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