Congatec Com Express conga-TC570 - Bootstrap Signals; Table 39 Bootstrap Signal Descriptions

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8.2 Bootstrap Signals

Table 39 Bootstrap Signal Descriptions

Signal Pin # Description of Bootstrap Signal I/O PU/PD Comment

HDA_SDOUT A33 High Deﬁnition Audio Serial Data Output O 3.3 VSB

SPKR B32 Output for audio enunciator, the “speaker” in PC-AT systems O 3.3 V

SPI_MOSI A95 Data out from module to carrier board SPI BIOS ﬂash O 3.3 VSB PU 4K75 3.3 VSB

SMB_ALERT# B15 System Management Bus Alert – active low input can be used to generate

an SMI# (System Management Interrupt) or to wake the system.

I 3.3 VSB PU 100 kΩ 3.3 VSB

BIOS_DIS0# A34 Selection strap to determine the BIOS boot device I 3.3 VSB PU 10 kΩ 3.3 VSB

BIOS_DIS1# B88 Selection strap to determine the BIOS boot device I 3.3 VSB PU 10 kΩ 3.3 VSB

DDI1_CTRLDATA_AUX- D16 Multiplexed with DP1_AUX- and HDMI1_CTRLDATA PU 100 kΩ 3.3 V

DP1_AUX- DP AUX- function if DDI1_DDC_AUX_SEL is no connect I/O PCIE

HDMI1_CTRLDATA HDMI/DVI I2C CTRLDATA if DDI1_DDC_AUX_SEL is pulled high I/O OD 3.3 V

DDI2_CTRLDATA_AUX- C33 Multiplexed with DP2_AUX- and HDMI2_CTRLDATA. PU 100 kΩ 3.3 V

DP2_AUX- DP AUX- function if DDI2_DDC_AUX_SEL is no connect I/O PCIE

HDMI2_CTRLDATA HDMI/DVI I2C CTRLDATA if DDI2_DDC_AUX_SEL is pulled high I/O OD 3.3 V

DDI3_CTRLDATA_AUX- C37 Multiplexed with DP3_AUX- and HDMI3_CTRLDATA. PU 100 kΩ 3.3 V

DP3_AUX- DP AUX- function if DDI3_DDC_AUX_SEL is no connect I/O PCIE

HDMI3_CTRLDATA HDMI/DVI I2C CTRLDATA if DDI3_DDC_AUX_SEL is pulled high I/O OD 3.3 V

Caution

1. The signals listed in the table above are used as chipset conﬁguration straps during system reset. In this condition (during reset), they are

inputs that are pulled to the correct state by either COM Express™ internally implemented resistors or chipset internally implemented

resistors that are located on the module.

2. No external DC loads or external pull-up or pull-down resistors should change the conﬁguration of the signals listed in the above table.

External resistors may override the internal strap states and cause the COM Express™ module to malfunction and/or cause irreparable

damage to the module.