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5.1. Board Specific SEMA Functions

5.1.1. Voltages

The BMC of the cExpress-BT2 implements a voltage monitor and samples several onboard voltages. The voltages can be read by calling

the SEMA function “Get Voltages”. The function returns a 16-bit value divided into high-byte (MSB) and low-byte (LSB).

ADC Channel Voltage Name Voltage Formula [V]

0 CPU-Vcore (MSB<<8 + LSB) x 3.3 / 1024

1 GFX-Vcore (MSB<<8 + LSB) x 3.3 / 1024

2 +V1.05S (MSB<<8 + LSB) x 3.3 / 1024

3 Vmem (MSB<<8 + LSB) x 3.3 / 1024

4 +V1.0V (MSB<<8 + LSB) x 3.3 / 1024

5 +V3.3V (MSB<<8 + LSB) x 1.1 x 3.3 / 1024

6 +VIN (MSB<<8 + LSB) x 6.000 x 3.3 / 1024

7 (MAIN CURRENT) Use Main Current Function

5.1.2. Main Current

The BMC of the cExpress-BT2 implements a current monitor. The current can be read by calling the SEMA function “Get Main Current”. The

function returns four 16-bit values divided in high-byte (MSB) and low-byte (LSB). These 4 values represent the last 4 currents drawn by the

board. The values are sampled every 250ms. The order of the 4 values is NOT in chronological order. Access by the BMC may increase the

drawn current of the whole system. In this case, there are still 3 samples not influenced by the read access.

Main Current = (MSB_n<<8 + LSB_n) x 8.06mA

5.1.3. BMC Status

This register shows the status of BMC controlled signals on the cExpress-BT2.

Status Bit Signal

0 WDT_OUT

1 LVDS_VDDEN

2 LVDS_BKLTEN

3 BIOS_MODE

4 POSTWDT_DISn

5 SEL_BIOS

6 BIOS_DIS0n

7 BIOS_DIS1n

1 2 ... 30 31 32 33 34 35 36 37 38 39 40 ... 76 77

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