Ssram, Ssram –58 – Altera Stratix IV GX FPGA Development Board User Manual
Page 66
2–58
Chapter 2: Board Components
Memory
Stratix IV GX FPGA Development Board
August 2012
Altera Corporation
Reference Manual
lists the QDRII+ top port 1 component reference and manufacturing
information.
SSRAM
The Synchronous Static Random Access Memory (SSRAM) device consists of a single
standard synchronous SRAM, providing 2 MB with a 36-bit data bus. This device is
part of the shared FSM Bus, which connects to the flash memory, SSRAM, and the
MAX
II CPLD EPM2210 System Controller.
The device speed is 250 MHz single-data-rate. There is no minimum speed for this
device. The theoretical bandwidth of this 32-bit memory interface is 8.0 Gbps for
continuous bursts. The read latency for any address is two clocks, in which at
250 MHz, the latency is 10 ns and at 50 MHz, the latency is 40 ns. The write latency is
one clock.
lists the SSRAM
pin assignments, signal names, and functions. The signal
names and types are relative to the Stratix IV GX device in terms of I/O setting and
direction.
Table 2–53. QDRII+ Top Port 1 Component Reference and Manufacturing Information
Board
Reference
Description
Manufacturer
Manufacturing
Part Number
Manufacturer
Website
U7
QDRII+, 4 M × 18, 400 MHZ
Cypress
CY7C2563KV18-400BZXC
NEC
uPD44647186AF5-E22-FQ1
Samsung
K7S3218U4C-EC40
Table 2–54. SSRAM Pin Assignments, Schematic Signal Names, and Functions (Part 1 of 3)
Board Reference
Description
Schematic Signal Name
I/O Standard
Stratix IV GX Device
Pin Number
U30.P2
Address bus (576 M expansion)
FSM_A25
2.5-V
AP30
U30.C10
Address bus (288 M expansion)
FSM_A24
2.5-V
AN30
U30.B11
Address bus (144 M expansion)
FSM_A23
2.5-V
AL31
U30.A1
Address bus (72 M expansion)
FSM_A22
2.5-V
AK31
U30.B1
Address bus (36 M expansion)
FSM_A21
2.5-V
AR32
U30.R11
Address bus
FSM_A20
2.5-V
AP32
U30.R10
Address bus
FSM_A19
2.5-V
AH29
U30.R9
Address bus
FSM_A18
2.5-V
AG29
U30.R8
Address bus
FSM_A17
2.5-V
AR35
U30.R4
Address bus
FSM_A16
2.5-V
AP35
U30.R3
Address bus
FSM_A15
2.5-V
AL32
U30.P11
Address bus
FSM_A14
2.5-V
AK32
U30.P10
Address bus
FSM_A13
2.5-V
AU33
U30.P9
Address bus
FSM_A12
2.5-V
AT33
U30.P8
Address bus
FSM_A11
2.5-V
AH30
U30.P4
Address bus
FSM_A10
2.5-V
AJ31
U30.P3
Address bus
FSM_A9
2.5-V
AR34