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LFX125B-4F900C Datasheet(PDF) 11 Page - Lattice Semiconductor

No. de pieza LFX125B-4F900C
Descripción Electrónicos  The ispXPGA architecture
Download  89 Pages
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Fabricante Electrónico  LATTICE [Lattice Semiconductor]
Página de inicio  http://www.latticesemi.com
Logo LATTICE - Lattice Semiconductor

LFX125B-4F900C Datasheet(HTML) 11 Page - Lattice Semiconductor

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Lattice Semiconductor
ispXPGA Family Data Sheet
11
Figure 11. ispXPGA PIO
VLI Routing Resources
The ispXPGA architecture contains a Variable-Length-Interconnect (VLI) routing technology connecting the PFUs,
PICs, and EBRs in the device. There are four types of routing resources, Global Lines, Long Lines, General Inter-
connect, and Local Lines forming the global routing structure. This allows a signal to be routed to any element in
the device with the optimal delay.
The Global Lines consist of global clock lines and a global set/reset line. These lines are routed to all elements in
the device. They are specifically designed for high speed, predictable timing regardless of fan-out. The global clock
lines can also be used as dedicated inputs.
The Long Lines consist of Horizontal and Vertical Long Lines (HLL and VLL). The VLL and HLL are tri-statable lines
spanning the entire device. These lines allow fast routing for high fan-out nets and general-purpose functions.
The General Interconnect consists of Double and Deca Lines. The Double Lines connect up to three elements (two
plus the driving element), while the Deca Lines connect up to eleven elements (ten plus the driving element).
The Local Lines are extremely fast routing paths consisting of Feedback and Direct Connect Lines. The Feedback
Lines are internal routing paths from the PFU outputs to the PFU inputs. The Direct Connect Lines connect all adja-
cent elements.
The Common Interface Block (CIB) provides the link between the logic element (PFU, PIC, or EBR) and the VLI
Routing resources. The CIB is a switch matrix that can be programmed to connect virtually any routing resource to
any input or output of the logic element.
Feed-through (FT)
OUT0
Clock (CLK)
Input Clock Enable (ICEN)
Input Set/Reset (ISR)
Global Set/Reset(GSR)
Output Clock Enable (OCEN)
PIO Input (IN)
Output Set/Reset (OSR)
PIO Output Enable(OEN)
PIO Input Enable (IEN)
OUT1
Delay
OE
From sysIO Input
To sysIO
Output
Enable
To sysIO
Output
CE
DQ
SR
CLK/LE
CE
DQ
SR
CLK/LE
CE
DQ
SR
CLK/LE
From sysHSI block
From sysHSI block
To Routing
To sysHSI
block
To sysHSI
block
Only for PIOs associated with sysHSI Blocks
Only for PIOs
Associated with
sysHSI Blocks


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