EP1M350 datasheet(55/86 Pages) ALTERA

55 / 86 page

Altera Corporation

Mercury Programmable Logic Device Family Data Sheet

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. Figure 29 shows

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.

Figure 29. IOE Connection to Interconnects and Adjacent LAB

Note (1)

Note to Figure 29:

(1)

INA: unregistered input; INB: registered/unregistered input; INC: registered/unregistered input or OE register

output in DDR mode.

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.

LAB

I/O Band

Row

Associated

LAB Row

IOE Pair

INA

INC

INB OUT

INA

INC

INB OUT

Row Interconnect

Priority Row

Interconnect

All Column Interconnects

Associated LAB

to IOE Pair

Local Interconnect

IOE pairs drive unregistered

inputs to the associated

LAB's local interconnect.

The associated LAB and its

neighbor can drive a given IOE

pair through the local interconnect.

IOE

IOE Pair

INA

INC

INB OUT

INA

INC

INB OUT

IOE

IOE Pair

INA

INC

INB OUT

INA

INC

INB OUT

IOE

To Local

Interconnect

To Next

LAB

EP1M350 Datasheet(PDF) 55 Page - Altera Corporation

EP1M350 Datasheet(HTML) 55 Page - Altera Corporation

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