LFXP6C-4QN208I Lattice, LFXP6C-4QN208I Datasheet - Page 225
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LFXP6C-4QN208I
Manufacturer Part Number
LFXP6C-4QN208I
Description
FPGA LatticeXP Family 6000 Cells 360MHz 130nm (CMOS) Technology 1.8V/2.5V/3.3V 208-Pin PQFP Tray
Manufacturer
Lattice
Specifications of LFXP6C-4QN208I
Package
208PQFP
Family Name
LatticeXP
Device Logic Units
6000
Maximum Internal Frequency
360 MHz
Typical Operating Supply Voltage
1.8|2.5|3.3 V
Maximum Number Of User I/os
142
Ram Bits
73728
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LFXP6C-4QN208I
Manufacturer:
Lattice Semiconductor Corporation
Quantity:
10 000
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Lattice Semiconductor
The DLL Lock Detect circuit has two modes of operation controlled by the LOCK_SENSITIVITY bit, which selects
more or less sensitivity to jitter. If this DLL is operated at or above 150 MHz, it is recommended that the
LOCK_SENSITIVITY bit be programmed “HIGH” (more sensitive). For operation running at or under 100 MHz it is
recommended that the bit be programmed “LOW” (more tolerant). For 133 MHz, the LOCK_SENSITIVITY bit can
go either way.
DQSBUF
This primitive implements the DQS Delay and the DQS transition detector logic. Figure 10-6 shows the DQSBUFB
function. The preamble detect signal is also generated within this primitive.
Figure 10-6. DQSBUFB Function
Figure 10-7 shows the primitive symbol and its ports. DQSI is the DQS signal from the memory. PRMBDET is the
preamble detect signal that is generated from the DQSI input. READ and CLK are user interface signals coming
from the FPGA logic. The DQSDLL block sends digital control line DQSDEL to this block. The DQS is delayed
based on this input from the DQSDLL. DQSO is the delayed DQS and is connected to the clock input of the first set
of DDR registers.
Figure 10-7. DQSBUFB Symbol
Table 10-5 provides a description of the I/O ports associated with the DQSBUFB primitive.
READ
DQSI
CLK
V
(DV ~ 170mV)
REF
V
REF
- DV
+
-
+
-
PRMBDET
DQSI
CLK
READ
DQSDEL
DQSBUFB
DQSBUFB
10-6
DDRCLKPOL
TRANSITION
PRMBDET
DQSDEL
DETECT
DQS
DQSO
DQSC
DQSDEL
LatticeECP/EC and LatticeXP
DQSC
PRMBDET
DDRCLKPOL
DQSO
DDR Usage Guide
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