ECP2 datasheet(39/386 Pages) LATTICE

39 / 386 page

2-36

Architecture

Lattice Semiconductor

LatticeECP2/M Family Data Sheet

Top Edge

The PICs on the top edge are different from PIOs on the left, right and bottom edges. PIOs on this edge do not

have DDR registers or DQS signals.

The exact DQS pins are shown in a dual function in the Logic Signal Connections table in this data sheet. Addi-

tional detail is provided in the Signal Descriptions table. The DQS signal from the bus is used to strobe the DDR

data from the memory into input register blocks. Interfaces on the left and right edges are designed for DDR mem-

ories that support 16 bits of data, whereas interfaces on the bottom are designed for memories that support 18 bits

of data.

Figure 2-33. DQS Input Routing for the Left and Right Edges of the Device

PIO B

PIO A

PIO B

PIO A

Assigned

DQS Pin

DQS

Delay

sysIO

Buffer

PADA "T"

PADB "C"

LVDS Pair

PADA "T"

PADB "C"

LVDS Pair

PIO A

PIO B

PADA "T"

PADB "C"

LVDS Pair

PIO A

PIO B

PADA "T"

PADB "C"

LVDS Pair

PIO A

PIO B

PADA "T"

PADB "C"

LVDS Pair

PIO A

PIO B

PADA "T"

PADB "C"

LVDS Pair

PIO A

PIO B

PADA "T"

PADB "C"

LVDS Pair

PIO A

PIO B

PADA "T"

PADB "C"

LVDS Pair

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