PC6-TANGO • CompactPCI
®
PlusIO • Intel® Atom™ E39xx Processor (APL-I SoC)
Local SMB/I
2
C Devices
The PC6-TANGO contains devices that are attached to the APL-I SoC System Management Bus
(SMBus). These are the SPD EEPROM for the on-board memory, the PLD (MachXO2) glue logic
including a set of board control and status registers, the CPU PMIC, a PCIe clock buffer, a general
purpose serial EEPROM and two general purpose, non-volatile electronic jumpers.
Additional off-board devices may be addressed via discrete I2C master controllers provided by the
APL-I SoC. While the APL I2C port 0 is used on the mezzanine connector P-EXP, the APL I2C port 1 is
wired to the CompactPCI
®
backplane connector J1 for peripheral card usage. The separation in
different threads reduces considerably potential SMBus/I2C addressing conflicts.
Controller
Address
Description
SMBus
0x2E
Board Control/Status (MachXO FPGA)
SMBus
0x2F
Non-volatile Electronic Jumper
SMBus
0x50
SPD on-Board Memory
SMBus
0x57
Board ID EEPROM
SMBus
0x5E
PMIC
SMBus
0x6B
DB800 Clock Buffer
I2C[0]
1)
P-EXP (Pins 29/30)
I2C[1]
1)
CPCI Backplane Connector J1 (Pins B17/C17)
1)
Address depends on devices attached
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