LFE2-35E-5FN484C LATTICE SEMICONDUCTOR, LFE2-35E-5FN484C Datasheet - Page 12
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LFE2-35E-5FN484C
Manufacturer Part Number
LFE2-35E-5FN484C
Description
IC, LATTICEECP2 FPGA, 420MHZ, FPBGA-484
Manufacturer
LATTICE SEMICONDUCTOR
Series
LatticeECP2r
Datasheet
1.LFE2-12E-5FN256C.pdf
(385 pages)
Specifications of LFE2-35E-5FN484C
No. Of Logic Blocks
32000
No. Of Macrocells
16000
No. Of Speed Grades
5
No. Of I/o's
331
Clock Management
DLL, PLL
I/o Supply Voltage
3.465V
Total Ram Bits
332Kbit
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LFE2-35E-5FN484C
Manufacturer:
Lattice Semiconductor Corporation
Quantity:
10 000
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Table 2-5. DLL Signals
DLLDELA Delay Block
Closely associated with each DLL is a DLLDELA block. This is a delay block consisting of a delay line with taps and
a selection scheme that selects one of the taps. The DCNTL[8:0] bus controls the delay of the CLKO signal. Typi-
cally this is the delay setting that the DLL uses to achieve phase alignment. This results in the delay providing a cal-
ibrated 90° phase shift that is useful in centering a clock in the middle of a data cycle for source synchronous data.
The CLKO signal feeds the edge clock network. Figure 2-7 shows the connections between the DLL block and the
DLLDELA delay block. For more information, please see the list of additional technical documentation at the end of
this data sheet.
Figure 2-7. DLLDELA Delay Block
PLL/DLL Cascading
LatticeECP2/M devices have been designed to allow certain combinations of PLL (GPLL and SPLL) and DLL cas-
cading. The allowable combinations are:
• PLL to PLL supported
• PLL to DLL supported
CLKI
CLKFB
RSTN
ALUHOLD
UDDCNTL
DCNTL[8:0]
CLKOP
CLKOS
LOCK
Signal
GDLLFB_PIO
CLKFB_CK
DLL_PIO
PLL_PIO
Routing
Routing
CLKOP
ECLK1
I/O
O
O
O
O
I
I
I
I
I
Clock input from external pin or routing
DLL feed input from DLL output, clock net, routing or external pin
Active low synchronous reset
Active high freezes the ALU
Synchronous enable signal (hold high for two cycles) from routing
Encoded digital control signals for PIC INDEL and slave delay calibration
The primary clock output
The secondary clock output with fine phase shift and/or division by 2 or by 4
Active high phase lock indicator
* Software selectable
*
*
*
CLKI
CLKFB
CLKI
DCNTL[8:0]
DLLDELA Delay Block
2-9
DLL Block
Description
LatticeECP2/M Family Data Sheet
CLKOP
CLKOS
LOCK
CLKO
Architecture
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