Altera Arria V GX Starter Board - Manual (Page 47)

Chapter 2: Board Components 2–39
Memory
November 2013 Altera Corporation Arria V GX Starter Board
Reference Manual
Memory
This section describes the starter board’s memory interface support and also their
signal names, types, and connectivity relative to the Arria V GX. The starter board has
the following memory interfaces:
■ DDR3 SDRAM
■ Synchronous SRAM
■ Synchronous flash
f For more information about the memory interfaces, refer to the following documents:
■ Timing Analysis section in volume 4 of the External Memory Interface Handbook.
■ DDR, DDR2, and DDR3 SDRAM Design Tutorials section in volume 6 of the
External Memory Interface Handbook.
DDR3 SDRAM
The starter board supports a 8Mx32x8 bank DDR3 SDRAM interface for very
high-speed sequential memory access. The 32-bit data bus consists of two x16 devices
with a single address or command bus. This interface connects to the vertical I/O
banks on the top edge of the FPGA.
This DDR3 SDRAM has two interface options. The first option is a x32 interface using
a hard memory controller. The second option is a x32 interface using a soft memory
controller.
With a hard memory controller, this interface runs at the target frequency of 533 MHz
for a maximum theoretical bandwidth of 33.31 Gbps. With a soft memory controller,
this interface runs at the target frequency of 667 MHz for a maximum theoretical
bandwidth of 41.66 Gbps. Though a soft memory controller runs at higher data rate
than a hard memory controller, the hard memory controller operates at a much higher
efficiency. The maximum frequency for the Micron device is 667 MHz with a CAS
latency of 9.
Table 2–43 lists the DDR3 pin assignments, signal names, and functions. The signal
names and types are relative to the Arria V GX in terms of I/O setting and direction.
Table 2–43. DDR3 Device Pin Assignments, Schematic Signal Names, and Functions (Part 1 of 4)
Board Reference
Schematic
Signal Name
Arria V GX
Pin Number
I/O Standard Description
DDR3 x16 (U11)
N3 DDR3_A0 D26 1.5-V SSTL Class I Address bus
P7 DDR3_A1 E27 1.5-V SSTL Class I Address bus
P3 DDR3_A2 A27 1.5-V SSTL Class I Address bus
N2 DDR3_A3 B27 1.5-V SSTL Class I Address bus
P8 DDR3_A4 G26 1.5-V SSTL Class I Address bus
P2 DDR3_A5 H26 1.5-V SSTL Class I Address bus
R8 DDR3_A6 K27 1.5-V SSTL Class I Address bus