Altera Cyclone IV GX Transceiver Starter Board - Manual (Page 30)

2–22 Chapter 2: Board Components
Memory
Cyclone IV GX Transceiver Starter Board Reference Manual © March 2010 Altera Corporation
Transceiver SMA Connectors (Optional)
Board references J9 and J8 are two optional input SMAs to the high-speed positive
and negative differential receiver channel while J11 and J10 are two optional output
SMAs from the high-speed positive and negative differential transmitter channel. By
default, the GXB_RX1 channel of the FPGA is connected to the Ethernet PHY through
capacitor multiplexer C59 and C58, while the GXB_TX1 channel is connected to the
Ethernet PHY through resistor multiplexer R53 and R52. You need to perform a solder
modification on the board if you intend to use the optional transceiver SMA
connectors. You can use these SMAs to connect to external circuit boards or
daughtercards for transceiver applications.
Table 2–27 shows the capacitor and resistor multiplexer locations to enable either the
default Ethernet PHY connection or the optional transceiver SMA connectors. The
capacitors multiplexer are 0.1-
μF capacitors and the multiplexer resistors are 0-Ω
resistors.
Memory
This section describes the board's memory interface support and also their signal
names, types, and connectivity relative to the Cyclone IV GX device. The board has
the following memory interfaces:
■ SSRAM
■ Flash
SSRAM
The SSRAM device consists of a single standard synchronous SRAM, providing
18-Mb of memory with a 16-bit data bus. This device is part of the shared FSML bus
which connects to the flash memory, SRAM, and MAX
II CPLD EPM2210 System
Controller.
Table 2–28 lists the SSRAM pin assignments, signal names, and functions. The signal
names and types are relative to the Cyclone IV GX device in terms of I/O setting and
direction.
Table 2–27. Multiplexer Locations for the Ethernet PHY Connection and Transceiver SMAs Connectors
Board Reference Description Multiplexer Location
C59, C58, C60, C57 Ethernet PHY RX enable ■ Populate C59 and C58
■ Unpopulate C60 and C57 (default)
R53, R52, R54, R51 Ethernet PHY TX enable ■ Populate R53 and R52
■ Unpopulate R54 and R51 (default)
C59, C58, C60, C57 Transceiver SMA RX enable ■ Populate C60 and C57
■ Unpopulate C59 and C58
R53, R52, R54, R51 Transceiver SMA TX enable ■ Populate R54 and R51
■ Unpopulate R53 and R52