Signal Terminations; Hps I/O Pins - Enclustra Mercury SA1 SoC Module User Manual

Figure 10: Power-Up Sequence - VCC_IO in Relation with PWR_GOOD and PWR_EN Signals
2.9.6

Signal Terminations

Differential Inputs
There are no external differential termination resistors on the Mercury SA1 SoC module for differential inputs.
Differential input pairs on the module connector may be terminated either by external termination resistors
on the base board (close to the module pins), or by the SoC device's internal termination resistors.
Please note that Cyclone V devices can only use I/O pins marked with "RX" in the name as differential inputs.
Single-Ended Outputs
There are no series termination resistors on the Mercury SA1 SoC module for single-ended outputs. If
required, series termination resistors may be equipped on the base board (close to the module pins).
2.9.7

HPS I/O Pins

Table 9 gives an overview over the HPS pin connections on the Mercury SA1 SoC module. Only the pins
marked with "user functionality" are available on the module connector.
The suggested functions below are for reference only - always verify your HPS pinout with the Intel device
handbook.
HPS_GPIO Function
0-8, 10-13 USB 2.0
14-27 Gigabit Ethernet
28 HPS boot select 2
29-34 QSPI flash
36, 38-39, 45-47 SD card/eMMC
37 Gigabit Ethernet interrupt (input, active-low)
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/user functionality
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Connection
USB 2.0 OTG PHY
Gigabit Ethernet PHY (RGMII)
Boot mode selection
QSPI flash
Module connector/eMMC flash
Gigabit Ethernet PHY
Version 06, 16.02.2021