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FCRAM I Controller
Overview
Fast Cycle RAM (FCRAM) is a DRAM technology with a specialized memory core technology that achieves faster random
access times and offers lower power consumption than traditional DRAMs. FCRAM is a trademark of Fujitsu Ltd., Japan.
As faster applications emerge in the networking and communications markets, there is a need for higher performance
memories to meet the architectural requirements of these emerging applications. FCRAM memory technology
addresses the needs of some of these emerging applications. For applications that require DRAM densities with random
cycle performance approaching SRAM speeds, FCRAM provides a cost effective solution.
Lattice's FCRAM I controller core provides a simple and flexible solution to interfacing different FCRAM I memories to
user application logic. On the memory side, the FCRAM I controller core interfaces to FCR AM I data bus widths with
(configurable) 8 or 16 bit DDR memory interfaces. On the user side the core provides a simple command interface that
accepts read, write, and refresh commands. The core interfaces to 256 Mbit FCRAM I devices (speed grades -60/CAS
latency 3 and 4 and -55/CAS latency 3).
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Features
Supports 8- and 16-Bit FCRAM I DDR Data Interfaces
Supports Parameterizeable Burst Lengths of 2 and 4
Supports Parameterizeable CAS Latencies of 3 or 4
Supports Controller Initiated Auto-refresh or User-initiated Auto/Self-refresh
Built-in Initialization Sequence Automatically Programs the FCRAM I with User Settings
Supports Bi-directional DDR Interface Between the Controller and FCRAM I (DQ and DQS)
Supports a Target FCRAM I DDR Interface Frequency of 156 to 167MHz in a LatticeEC&trade or LatticeECP&trade
Device
Evaluation Configurations
Parameter File SLICEs LUTs Registers I/Os sysMEM EBRs fMAX (MHz)
fcram_one_e2_1_001.lpc 469 588 494 129 0 0
Performance and Utilization for LatticeECP/EC1
1 Performance and utilization characteristics are generated using LFEC20E-5F672C in Lattice's ispLEVERv4.2 software.
Parameter File SLICEs LUTs Registers I/Os sysMEM EBRs fMAX (MHz)
fcram_one_xm_1_001.lpc 407 512 512 129 0 166.66
Performance and Utilization for LatticeXP1
1 Performance and utilization characteristics are generated using LFXP10 C -5F388C in Lattice's ispLEVER v5.0
software. When using this IP core in a different density, speed, or grade within the LatticeXP family, performance may
vary.
Ordering Information
Part Numbers:
For LatticeECP/EC:FCRAM-ONE-E2-N1
For LatticeXP: FCRAM-ONE- XM -N1
To find out how to purchase the FCRAM I Controller IP Core, please contact your local Lattice Sales Office.
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