Altera Cyclone III Development Board - Manual (Page 68)

2–58 Chapter 2: Board Components
On-Board Memory
Cyclone III 3C120 Development Board Reference Manual © March 2009 Altera Corporation
Table 2–55 lists the SRAM board reference and manufacturing information.
f For more information about timing parameter values, mode register settings (MRS),
or any other data regarding the Samsung device, visit
www. samsung.com .
Flash Memory
The board features 64 MB of flash memory with a 16-bit data bus. The device uses
1.8-V CMOS signaling and is used for storing configuration files for the FPGA as well
as any other files such as Nios software binaries, libraries, images, and sounds.
The interface uses a single Spansion device. The part number is S29GL512N11FFIV1.
The device features CFI flash command support, byte- and word-mode operation,
and 110 ns access times for a theoretical read bandwidth of 145 Mbps.
The flash device is part of a shared bus with connectivity to the MAX II CPLD as well
as the SRAM memory, which is called the FSM bus. All three devices use 1.8-V CMOS
signaling. Altera recommends using the 50-
Ω OCT setting on the FPGA. The flash
does not have a drive strength setting.
Table 2–56 shows the required signals for flash memory. Signal direction is relative to
the FPGA.
Table 2–55. SRAM Manufacturing Information
Board Reference Description Manufacturer
Manufacturer Part
Number
Manufacturer
Website
U23, U24 32 MB (2 M × 16) of
SRAM
Samsung
Semiconductor
K1B3216B2E-BI70 www.samsung.com
Table 2–56. Flash Interface I/O (Part 1 of 2)
Board
Reference Description I/O Standard
Schematic
Signal Name
Cyclone III
Device
Pin Number
U31 pin F2 Chip enable 1.8 V FLASH_CEn Y16
U31 pin G2 Output enable 1.8 V FLASH_OEn Y17
U31 pin A4 Ready/busy 1.8 V FLASH_RDYBSYn AG25
U31 pin B5 Reset 1.8 V FLASH_RESETn AB20
U31 pin A5 Write enable 1.8 V FLASH_WEn AA21
U31 pin F7 Word/byte 1.8 V FLASH_BYTEn (1)
U31 pin E2 Address bus bit 0 (word aligned) 1.8 V FSA0 AC11
U31 pin D2 Address bus bit 1 (word aligned) 1.8 V FSA1 AH10
U31 pin C2 Address bus bit 2 (word aligned) 1.8 V FSA2 AA13
U31 pin A2 Address bus bit 3 (word aligned) 1.8 V FSA3 AC10
U31 pin B2 Address bus bit 4 (word aligned) 1.8 V FSA4 Y15
U31 pin D3 Address bus bit 5 (word aligned) 1.8 V FSA5 AF22
U31 pin C3 Address bus bit 6 (word aligned) 1.8 V FSA6 AF26
U31 pin A3 Address bus bit 7 (word aligned) 1.8 V FSA7 AF4
U31 pin B6 Address bus bit 8 (word aligned) 1.8 V FSA8 AD8
U31 pin A6 Address bus bit 9 (word aligned) 1.8 V FSA9 AG26