Lattice Semiconductor MachXO2 Programming And Configuration Usage Manual page 8

The Configuration Flash is, for most designs, large enough to store the compressed configuration data that is
loaded into the SRAM configuration memory. However, as the amount of logic in the design increases, and the
amount of pre-initialized EBR increases, the size of the configuration data also increases. The increase in size can
cause the configuration data to overflow into the UFM sector. It is also possible, but unlikely, that the configuration
data can get too large for the internal Flash memory altogether. In the event configuration data grows too large to fit
in the combined Configuration Flash/UFM memory space the design needs to be modified so that it is smaller, or
an external configuration memory must be used. You can provide input to the software generating the configuration
data to prevent the overflow into the UFM.
In the event the configuration data is too large for the combined Configuration Flash and UFM memory you can
store the device bitstream in an external SPI Flash. Table 2 shows the maximum uncompressed bitstream sizes
allowing you to select a SPI Flash.
Table 2. Maximum Configuration Bits
Uncompressed Bitstream Size
Device
LCMXO2-256
LCMXO2-256HC
LCMXO2-256ZE
LCMXO2-640
LCMXO2-640HC
LCMXO2-640ZE
LCMXO2-640UHC
LCMXO2-1200
LCMXO2-1200HC
LCMXO2-1200ZE
LCMXO2-1200UHC
LCMXO2-2000
LCMXO2-2000HC
LCMXO2-2000HE
LCMXO2-2000ZE
LCMXO2-2000U
LCMXO2-2000UHC
LCMXO2-2000UHE
LCMXO2-4000
LCMXO2-4000HE
LCMXO2-4000HC
LCMXO2-4000ZE
LCMXO2-7000
LCMXO2-7000HE
LCMXO2-7000HC
LCMXO2-7000ZE
MachXO2 Programming and Configuration Usage Guide
Uncompressed Bitstream Size
Without EBR
0.09
0.09
0.09
0.19
0.19
0.19
0.19
0.35
0.35
0.35
0.35
0.51
0.51
0.51
0.51
0.51
0.51
0.51
0.93
0.93
0.93
0.93
1.47
1.47
1.47
1.47
With EBR
N/A
N/A
N/A
0.20
0.20
0.20
0.20
0.41
0.41
0.41
0.41
0.58
0.58
0.58
0.58
0.58
0.58
0.58
1.02
1.02
1.02
1.02
1.70
1.70
1.70
1.70
8
Maximum
Internal Flash Units
0.071 Mb
0.071 Mb
0.071 Mb
0.17 Mb
0.17 Mb
0.17 Mb
0.17 Mb
0.33 Mb
0.33 Mb
0.33 Mb
0.33 Mb
0.47 Mb
0.47 Mb
0.47 Mb
0.47 Mb
0.47 Mb
0.47 Mb
0.47 Mb
0.80 Mb
0.80 Mb
0.80 Mb
0.80 Mb
1.38 Mb
1.38 Mb
1.38 Mb
1.38 Mb