
Chapter 2: Board Components
2–41
Memory
© October 2009 Altera Corporation
Cyclone III LS FPGA Development Board Reference Manual
Table 2–41
lists the SSRAM component reference and manufacturing information.
Flash
The flash interface consists of a single synchronous flash memory device, providing
64 Mbyte with a 16-bit data bus. This device is part of the shared FSM bus which
connects to the flash memory, SRAM, and MAX II CPLD EPM2210 System Controller.
There are two 256-Mbyte die per package with A(25) low selecting the lower die and
A(25) high selecting the upper die. The parameter blocks are 32 K and main blocks are
128 K. The parameters of this device are located at both the top and bottom of the
address space.
This 16-bit data memory interface can sustain burst read operations at up to 52 MHz
for a throughput of 832 Mbps. The write performance is 125 µs for a single word and
440 µs for a 32-word buffer. The erase time is 400 ms for a 32 K parameter block and
1200 ms for a 128 K main block.
U14.A7
Byte write enable
SRAM_BWEn
2.5-V
AH8
U14.B5
Byte lane 0 write enable
SRAM_BWn0
AC12
U14.A5
Byte lane 1 write enable
SRAM_BWn1
AH11
U14.A4
Byte lane 2 write enable
SRAM_BWn2
AH4
U14.B4
Byte lane 3 write enable
SRAM_BWn3
AE22
U14.B3
Chip enable
SRAM_CE2
—
U14.A6
Chip enable
SRAM_CE3n
—
U14.A3
Chip enable
SRAM_CEn
AH10
U14.B6
Clock
SRAM_CLK
AG25
U14.N11
Data bus parity byte lane 0
SRAM_DQP0
AD19
U14.C11
Data bus parity byte lane 1
SRAM_DQP1
AF22
U14.C1
Data bus parity byte lane 2
SRAM_DQP2
AE8
U14.N1
Data bus parity byte lane 3
SRAM_DQP3
AE17
U14.B7
Global write enable
SRAM_GWn
AC19
U14.R1
Mode
SRAM_MODE
—
U14.B8
Output enable
SRAM_OEn
AB13
U14.H11
Sleep
SRAM_ZZ
AH14
Table 2–40.
SSRAM Pin Assignments, Schematic Signal Names, and Functions (Part 3 of 3)
Board Reference
Description
Schematic Signal Name
I/O Standard
Cyclone III LS Device
Pin Number
Table 2–41.
SSRAM Component Reference and Manufacturing Information
Board Reference
Description
Manufacturer
Manufacturing
Part Number
Manufacturer
Website
U14
Standard Synchronous Pipelined
SCD, 512 K × 36, 200 MHz
ISSI Inc.
IS61VPS51236A-250B3
www.issi.com