LFEC10E-3F256C Lattice Semiconductor Corp., LFEC10E-3F256C Datasheet - Page 119

• Manufacturer Part Number: LFEC10E-3F256C
• Description: Latticeecp/ec Family of Fpga Devices Has Been Optimized to Deliver Mainstream Fpga Features at Low Cost.for Maximum Performance And Value, The Latticeecp (EConomy Plus) Fpga Concept Combines an Efficient Fpgafabric With High-speed Dedicated Functions
• Manufacturer: Lattice Semiconductor Corp.

Lattice Semiconductor
Table 8-9. Pseudo-Dual Port RAM Attributes for LatticeECP/EC Devices
Read Only Memory (ROM) – EBR Based
The EBR blocks in the LatticeECP/EC devices can be configured as Read Only Memory or ROM. The Module
Manager allows users to generate the Verilog-HDL or VHDL along with an EDIF netlist for the memory size as per
design requirements. Users are required to provide the ROM memory content in the form of an initialization file.
The Module Manager generates the memory module as shown in Figure 8-11.
Figure 8-11. ROM - Read Only Memory Module Generated by Module Manager
The generated module makes use of these EBR blocks or primitives. For memory sizes smaller than an EBR block,
the module will be created in one EBR block. If the specified memory is larger than one EBR block, multiple EBR
blocks can be cascaded, in depth or width (as required to create these sizes).
The basic ROM primitive for the LatticeECP/EC devices is as shown in Figure 8-12.
DATA_WIDTH_W Write Data Word Width
DATA_WIDTH_R
REGMODE
RESETMODE
CSDECODE_W
CSDECODE_R
GSR
Attribute
Read Data Word Width
Register Mode (Pipelining)
Selects the Reset type
Chip Select Decode for Write 000, 001, 010, 011, 100, 101, 110, 111
Chip Select Decode for Read 000, 001, 010, 011, 100, 101, 110, 111
Global Set Reset
Description
OutClockEn
OutClock
Address
Reset
1, 2, 4, 9, 18, 36
1, 2, 4, 9, 18, 36
NOREG, OUTREG
ASYNC, SYNC
ENABLE, DISABLE
EBR based Read Only
8-12
Memory
ROM
Values
Q
for LatticeECP/EC Devices
Memory Usage Guide for
ENABLED
Default
NOREG
ASYNC
Value
000
000
1
1
Through Module
User Selectable
Manager
YES
YES
YES
YES
YES
NO
NO