LFEC3E-3QN208I Lattice, LFEC3E-3QN208I Datasheet - Page 349

• Manufacturer Part Number: LFEC3E-3QN208I
• Description: IC FPGA 3KLUTS 208PQFP
• Manufacturer: Lattice
• Series: EC3r

Specifications of LFEC3E-3QN208I

• Number Of Logic Elements/cells: 3100
• Number Of Labs/clbs: -
• Total Ram Bits: 56320
• Number Of I /o: 145
• Number Of Gates: -
• Voltage - Supply: 1.14 V ~ 1.26 V
• Mounting Type: Surface Mount
• Operating Temperature: -40°C ~ 100°C
• Package / Case: 208-BFQFP
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: Q6377645

Lattice Semiconductor
Table 12-4. LatticeECP/EC Device Preference List
Persistent
When using the sysCONFIG port to perform transparent readback the PERSISTENT preference must be set to
ON, this reserves the dual-purpose pins for configuration. PERSISTENT = ON prevents the user and the software
fitter from using any of the dual-purpose pins as general purpose I/O.
Configuration Mode
The device knows which physical port will be used by reading the highs and lows wired to the CFG[0:2] pins, how-
ever sometimes software needs to know the setting of the CFG pins as well. The Configuration Mode serves this
purpose. The fitter will be prevented from using the I/O pins associated with the selected Configuration Mode, how-
ever the user may assign these pins (a warning will be generated by the software). If the user requires these pins
as general purpose I/O they must adhere to the requirements listed above in the Configuration Pins section.
Normally, proper selection of the Configuration Mode is not strictly required. For pin reservation, for instance, the
user can place prohibits in the source code to insure that the fitter doesn’t use the configuration pins as general
purpose I/O. However, if multiple devices are being configured from one configuration device then the Configura-
tion Mode must match the CFG pins. This is required because the overflow option (Flow Through or Bypass) is
determined by the Configuration Mode (in software) and the CFG pins (in hardware). Note that if either overflow
option is selected, then the DONE_EX and WAKE_UP selections will be changed to correspond. See Table 12-5
for details on the Overflow Option defaults. For more information on the overflow options, see the Configuration
Options section of this document.
Table 12-5. Overflow Option Defaults
DONE Open Drain
The “DONE_OD” preference allows the user to configure the DONE pin as an open drain pin. The “DONE_OD”
preference is only used for the DONE pin. When the DONE pin is driven low, internally or externally, this indicates
that programming is not complete and the device is not ready for wake up. Once configuration is complete, with no
errors, and the device is ready for wake-up, the DONE pin must be driven high. For other devices to be used to con-
trol the wake-up process an open drain configuration is needed to avoid contention on the DONE pin. The
“DONE_OD” preference for the DONE pin defaults to ON. The DONE_OD preference will be automatically set to
the default if the DONE_EX preference is set to on. See Table 12-6 for more information on the relationship
between DONE_OD and DONE_EX.
(Bypass, Flow Through)
Overflow Option
PERSISTENT
CONFIG_MODE
DONE_OD
DONE_EX
MCCLK_FREQ
CONFIG_SECURE
WAKE_UP
COMPRESS_CONFIG
Off
Off
On
Preference (Preference)
Off (default)
On
ON (automatically set by software)
DONE_EX Preference
ON [off, on]
SLAVE_SERIAL (see Table 12-2)
ON [on, off]
OFF [off, on]
Lowest Frequency (see device tables)
OFF [off, on]
21 (DONE_EX = Off) [1:25] 4 (DONE_EX = On) [1:7]
OFF (off, on)
12-16
Default Setting (All Settings)
LatticeECP/EC sysCONFIG Usage Guide
Default 21 (user selectable 1 through 25)
Default 21 (user selectable 1 through 25)
Default 4 (user selectable 1 through 7)
WAKE_UP Preference