ep1m120 Altera Corporation, ep1m120 Datasheet - Page 55

• Manufacturer Part Number: ep1m120
• Description: Programmable Logic Device Family
• Manufacturer: Altera Corporation

Altera Corporation
Figure 29. IOE Connection to Interconnects and Adjacent LAB
To Local
Interconnect
Note to
(1)
IN
IOE
B
IN
output in DDR mode.
OUT
A
Figure
: unregistered input; IN
IN
IN
IOE pairs drive unregistered
inputs to the associated
LAB's local interconnect.
IOE Pair
C
A
LAB
29:
IN
IOE
B
OUT
IN
IN
C
A
Each row of I/O pins has an associated LAB row for driving to and from
the core of the Mercury device. For a given I/O band row, its associated
LAB row is located below it with the exception of the bottom I/O band
row. The bottom I/O band is located at the bottom periphery of the
device, hence its associated LAB row is located above it.
an example of an I/O band to associated LAB row interconnect in a
Mercury device.
There is a maximum of two IOEs associated with each LAB in the
associated LAB row. The local interconnect of the associated LAB drives
the IOEs. Since local interconnect is shared with the LAB neighbor, any
given LAB can directly drive up to four IOEs. The local interconnect
drives the data and OE signals when the IOE is used as an output or
bidirectional pin.
The IOEs drive registered or combinatorial versions of input data into the
device. The unregistered input data can be driven to the local interconnect
(for fast input setup), row and priority row interconnect, and column and
priority column interconnects. The registered data can also be driven to
the same row and column resources. The OE register output can be fed
back through column and row interconnects to implement DDR I/O pins.
B
: registered/unregistered input; IN
IN
IOE
B
OUT
IN
IN
IOE Pair
C
A
LAB
IOE
IN
B
The associated LAB and its
neighbor can drive a given IOE
pair through the local interconnect.
OUT
Mercury Programmable Logic Device Family Data Sheet
IN
IN
C
A
C
IN
IOE
: registered/unregistered input or OE register
B
Note (1)
OUT
IN
IN
Associated LAB
IOE Pair
C
A
to IOE Pair
LAB
IOE
IN
B
OUT
Local Interconnect
IN
IN
C
A
All Column Interconnects
Figure 29
To Next
LAB
Row Interconnect
I/O Band
Row
shows
Priority Row
Interconnect
Associated
LAB Row
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