APOLLO user manual
Issue G
120
SMBUS
Connector J24 provides an interface to the system management bus commonly known
as the SMBUS. Below is a list of devices that are present on the APOLLO board and their
corresponding 7-bit SMBUS address, care should be taken to ensure that any new
device added to the bus does not conflict with existing devices as this may cause boot
issues.
Boot issues may also occur if the SMBUS clock and data lines are held high or low for an
extended period. This is particularly important with devices using external power, as they
may not be powered on and configured at the same time the APOLLO accesses the
SMBUS.
SMBUS address SMBUS device
0x2D SuperIO hardware monitor (APOLLO V1Ix)
0x44 Ethernet 1, default address
0x50 DDR DIMM 0 serial presence device
0x54 CMOS backup EEPROM
0x69 Spread spectrum clock generator IC
0x6A CK-408 clock generator IC
User jumper
The APOLLO provides two user jumpers for use with program code. These are interfaced
to the firmware hub and are IO mapped.
USER jumper Firmware hub GPI Alternate function (V1Ix)
1 2 Reload CMOS
2 3 None
On the APOLLO V1Ix boards, the USER jumper 1 connection has an alternate
function to signal to the BIOS to reload the CMOS values from the system BIOS.
Care should be taken to ensure that this jumper is not fitted at power on.
On the V2Ix APOLLO boards a dedicated user jumper provides the reload CMOS
function.
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