APEX 20KC Programmable Logic Device Data Sheet
MegaLAB Structure
APEX 20KC devices are constructed from a series of MegaLAB
TM
structures. Each MegaLAB structure contains 16 logic array blocks (LABs),
one ESB, and a MegaLAB interconnect, which routes signals within the
MegaLAB structure. In EP20K1000C devices, MegaLAB structures
contain 24 LABs. Signals are routed between MegaLAB structures and
I/O pins via the FastTrack interconnect. In addition, edge LABs can be
driven by I/O pins through the local interconnect.
Figure 2
shows the
MegaLAB structure.
Figure 2. MegaLAB Structure
MegaLAB Interconnect
To Adjacent
LAB or IOEs
LE1
LE2
LE3
LE4
LE5
LE6
LE7
LE8
LE9
LE10
LE1
LE2
LE3
LE4
LE5
LE6
LE7
LE8
LE9
LE10
LE1
LE2
LE3
LE4
LE5
LE6
LE7
LE8
LE9
LE10
ESB
Local
Interconnect
LABs
Logic Array Block
Each LAB consists of 10 LEs, the LEs’ associated carry and cascade chains,
LAB control signals, and the local interconnect. The local interconnect
transfers signals between LEs in the same or adjacent LABs, IOEs, or ESBs.
The Quartus II Compiler places associated logic within an LAB or adjacent
LABs, allowing the use of a fast local interconnect for high performance.
Figure 3
shows the APEX 20KC LAB.
APEX 20KC devices use an interleaved LAB structure. This structure
allows each LE to drive two local interconnect areas, minimizing the use
of the MegaLAB and FastTrack interconnect and providing higher
performance and flexibility. Each LE can drive 29 other LEs through the
fast local interconnect.
Altera Corporation
9
ALTERA [ ALTERA CORPORATION ]
