Shiratech Solutions Spark-100, Integration Manual, Page: 16 / 41

16 | Spark-100 HW user manual v1.3
The I2C expander address is
0xE1 Read
0xE0 Write
2.3.6.2 I2C1 I/O Expander
The HPS I2C1 interface is connected to an I/O expander to enable more GPIO for control. The following
table provides mapping of the I/Os:
Port Signal Type Description
0-0 USB_HUB_OTG_SEL Out Select between USB OTG and USB HUB
"0" – OTG
"1" – HUB
0-1 Main_CLK_SEL
Out Do not use leave as input!
0-2 REF_CLK_SEL Out Select the clock generator source clock .
"0" – Primary (internal)
"1" – Secondary (external)
0-3 CLK_SYNC Out Synchronize the clock generator
0-4 CLK_PDN Out Disable the clock generator(clock generator )
"0" – Disable
"1" – Enabled
0-5 CLK_RESETN Out Reset the clock generator(clock generator)
"0" – Reset
"1" – Normal
0-6
0-7 Not in Use
1-0 – 1-5 Connected to SMARC
connector as GPIOs Out User define
1-6 SATA_ACT# Out SATA is active (When available)
"0" – Off
"1" – on
1-7
INT1_A
Out On board debug Led
"0" – off
"1" – On
2.3.6.3 I2C Address table
The following table describes the I2C addresses mapping:
1 1 1 0 0 0 0 RW