LFE2-20E-5FN256I Lattice, LFE2-20E-5FN256I Datasheet - Page 718

• Manufacturer Part Number: LFE2-20E-5FN256I
• Description: IC FPGA 21KLUTS 193I/O 256FPBGA
• Manufacturer: Lattice
• Series: ECP2r

Specifications of LFE2-20E-5FN256I

• Number Of Logic Elements/cells: 21000
• Number Of Labs/clbs: 2625
• Total Ram Bits: 282624
• Number Of I /o: 193
• Number Of Gates: -
• Voltage - Supply: 1.14 V ~ 1.26 V
• Mounting Type: Surface Mount
• Operating Temperature: -40°C ~ 100°C
• Package / Case: 256-BGA
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 220-1170; LFE2-20E-5FN256I; Q6411457

Lattice Semiconductor
LatticeECP2/M sysCONFIG Usage Guide
Figure 15-12. Wake-Up Timing Diagram
BCLK
DONE BIT
GLOBAL OUTPUT ENABLE
GLOBAL SET/RESET
GLOBAL WRITE DISABLE
DONE PIN
T0
T1
T2
T3
Synchronizing Wake-Up
The internal Wake-Up sequence clock source can be chosen as well as how the device wakes up relative to other
devices.
Wake-Up Clock Selection
The Wake-Up sequence is synchronized to a clock source that is user selectable. The clock sources are External
(default) and User Clock.
When External is selected the LatticeECP2/M will use one of two clocks during the Wake-Up sequence, depending
on the configuration data source. If the LatticeECP2/M is being configured from JTAG then JTAG’s TCK will be
used for the Wake-Up sequence, if configuration data is coming from a sysCONFIG port (serial, parallel, or SPI)
then CCLK will be used.
When User is selected, any of the clock signals in the design can be used as the clock source.
Synchronous to Internal Done Bit
If the LatticeECP2/M is the only device in the configuration chain, or the last device in the chain, DONE_EX should
be set to the default value (OFF). The Wake-Up process will be initiated by setting of the internal Done bit on suc-
cessful completion of configuration.
Synchronous to External DONE Pin
The DONE pin can be used to synchronize Wake-Up to other devices in the configuration chain. If DONE_EX (see
the DONE_OD, DONE_EX section above) is ON then the DONE pin is a bi-directional pin. If an external device
drives the DONE pin low then the Wake-Up sequence will be delayed; configuration can complete but Wake-Up is
delayed. Once the DONE pin goes high the device will follow the selected WAKE_UP sequence.
In a configuration chain, a chain of devices configuring from one source (such as Figure 15-2), it is usually desir-
able, or even necessary, to delay wake-up of all of the devices until the last device finishes configuration. This is
accomplished by setting DONE_OD to OFF and DONE_EX to OFF on the last device while setting DONE_OD to
ON and DONE_EX to ON for the other devices.
Wake-Up Sequence Options
The Wake-Up sequence options shown in Table determine the order of application for three internal signals, GSR,
GWDIS, and GOE, and one external signal, DONE.
• GSR is used to set and reset the core of the device. GSR is asserted (low) during configuration and de-asserted
(high) in the Wake-Up sequence.
15-22