Intel® Agilex™ Device Family Pin Connection Guidelines

ID 683112
Date 9/22/2022
Public
Document Table of Contents

1.7.9. HPS I2C_EMAC and MDIO Pins

Note: Intel® recommends that you create an Intel® Quartus® Prime design, enter your device I/O assignments, and compile the design. The Intel® Quartus® Prime software will check your pin connections according to I/O assignment and placement rules. The rules differ from one device to another based on device density, package, I/O assignments, voltage assignments, and other factors that are not fully described in this document or the device handbook.

There are three sets of I2C_EMAC interfaces that can be used as I2C interfaces or as the MDIO pins for the EMACs. Please take note that the I2C_EMAC and MDIO modules must be used with the corresponding EMAC interfaces. For example, you can use either I2C_EMAC0_SDA and I2C_EMAC0_SCL or MDIO0_MDIO and MDIO0_MDC with EMAC0.

The I2C protocol requires pull-up resistors to VCCIO_HPS on both the serial data and serial clock signals for them to function correctly. The value of the pull-up resistor varies depending on your board loading, but it is typically 4.7-kΩ or lower.

Typically the MDIO pin requires an external pull-up resistor to VCCIO_HPS in the range of 1.0-kΩ to 4.7-kΩ.

Table 30.  HPS I2C_EMAC and MDIO Pins
HPS Pin Function Pin Description and Connection Guidelines Pin Type Valid Assignments (select from one of the groups)
Group 1 Group 2 Group 3
I2C_EMAC2_SDA I2C EMAC2 Serial Data I/O HPS_IOA_7 HPS_IOB_9 HPS_IOB_21
I2C_EMAC2_SCL I2C EMAC2 Serial Clock I/O HPS_IOA_8 HPS_IOB_10 HPS_IOB_22
I2C_EMAC1_SDA I2C EMAC1 Serial Data I/O HPS_IOA_9 HPS_IOB_19
I2C_EMAC1_SCL I2C EMAC1 Serial Clock I/O HPS_IOA_10 HPS_IOB_20
I2C_EMAC0_SDA I2C EMAC0 Serial Data I/O HPS_IOA_11 HPS_IOB_11 HPS_IOB_23
I2C_EMAC0_SCL I2C EMAC0 Serial Clock I/O HPS_IOA_12 HPS_IOB_12 HPS_IOB_24
MDIO2_MDIO EMAC2 MDIO I/O HPS_IOA_7 HPS_IOB_9
MDIO2_MDC EMAC2 MDC Output HPS_IOA_8 HPS_IOB_10
MDIO1_MDIO EMAC1 MDIO I/O HPS_IOA_9 HPS_IOB_19
MDIO1_MDC EMAC1 MDC Output HPS_IOA_10 HPS_IOB_20
MDIO0_MDIO EMAC0 MDIO I/O HPS_IOA_11 HPS_IOB_11 HPS_IOB_23
MDIO0_MDC EMAC0 MDC Output HPS_IOA_12 HPS_IOB_12 HPS_IOB_24

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