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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
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