Altera Arria V SoC Development Board - Manual (Page 45)

Chapter 2: Board Components 2–37
Components and Interfaces
July 2014 Altera Corporation Arria V SoC Development Board
Reference Manual
Real-Time Clock (HPS)
The HPS system has a battery-backed real-time clock (RTC) connected through the I 2 C
interface. The RTC is implemented using a DS1339 device from Maxim
Semiconductor. The device has a built-in power sense circuit that detects power
failures and automatically switches to backup battery supply, maintaining time. The
device uses a CR1225 lithium coin battery with a nominal voltage of 3 V. Using typical
current capacity, the RTC is expected to have 120,000 backup hours. The battery is
mounted inside a holder attached to the board to allow battery replacement or
removal.
Table 2–24 lists the RTC device pin assignments, signal names, and functions. The
signal names and types are relative to the Arria V SoC in terms of I/O setting and
direction.
SFP+
The development board include two SFP+ ports that uses two transceiver channels
from the FPGA. These ports takes in serial data from the FPGA and transform them
into optical signals. Both SFP+ ports are active and include the SFP+ cage assembly.
Table 2–25 list the SFP+ ports interface pin assignments, signal names, and functions.
18 RESET_HPS_UARTB_N — 3.3-V Reset
11 POWER_ENB — 3.3-V Power
Table 2–23. RS-232 UART Schematic Signal Names and Functions
Board Reference
Schematic Signal
Name
Arria V SoC Pin
Number
I/O Standard Description
Table 2–24. RTC Device Schematic Signal Names and Functions
Board
Reference (U11)
Schematic Signal
Name
Arria V SoC Pin
Number
I/O Standard Description
16 I2C_SDA_HPS C13 3.3-V Management serial data
1 I2C_SCL_HPS L13 3.3-V Management serial clock
Table 2–25. SFP+ Ports Pin Assignments, Schematic Signal Names, and Functions (Part 1 of 2)
Board
Reference
Schematic
Signal Name
Arria V SoC
Pin Number
I/O Standard Description
SFP+ Port A (J44)
6 SFPA_MOD0_PRSNTn AR9 3.3-V LVTTL Module present indicator
8 SFPA_LOS AV7 3.3-V LVTTL Signal present indicator
2 SFPA_TXFAULT AL9 3.3-V LVTTL Transmitter fault indicator
12 SFPA_RX_N AE2 PCML Receiver data
13 SFPA_RX_P AE1 PCML Receiver data
5 SFPA_MOD1_SCL AT8 3.3-V LVTTL Serial 2-wire clock
4 SFPA_MOD1_SDA AH8 3.3-V LVTTL Serial 2-wire data
3 SFPA_TXDISABLE AP7 3.3-V LVTTL Drive low to disable transmitter
19 SFPA_TX_N AD4 PCML Transmitter data