LFEC10 datasheet(24/163 Pages) LATTICE

24 / 163 page

2-21

Architecture

Lattice Semiconductor

LatticeECP/EC Family Data Sheet

For further information about the sysDSP block, please see the list of technical information at the end of this data

sheet.

Programmable I/O Cells (PIC)

Each PIC contains two PIOs connected to their respective sysI/O Buffers which are then connected to the PADs as

shown in Figure 2-24. The PIO Block supplies the output data (DO) and the Tri-state control signal (TO) to sysI/O

buffer, and receives input from the buffer.

Figure 2-24. PIC Diagram

Two adjacent PIOs can be joined to provide a differential I/O pair (labeled as “T” and “C”) as shown in Figure 2-25.

The PAD Labels “T” and “C” distinguish the two PIOs. Only the PIO pairs on the left and right edges of the device

can be conﬁgured as LVDS transmit/receive pairs.

One of every 16 PIOs contains a delay element to facilitate the generation of DQS signals. The DQS signal feeds

the DQS bus which spans the set of 16 PIOs. Figure 2-25 shows the assignment of DQS pins in each set of 16

PIOs. The exact DQS pins are shown in a dual function in the Logic Signal Connections table at the end of this data

sheet. Additional detail is provided in the Signal Descriptions table at the end of this data sheet. The DQS signal

from the bus is used to strobe the DDR data from the memory into input register blocks. This interface is designed

for memories that support one DQS strobe per eight bits of data.

PIO B

PADA

"T"

PADB

"C"

OPOS0

ONEG0

OPOS1

ONEG1

INCK

INDD

INFF

IPOS0

IPOS1

CLK

LSR

GSRN

PIO A

sysIO

Buffer

DQS

DDRCLKPOL

IOLD0

IOLT0

DDRCLK

IPOS1

IPOS0

INCK

INDD

INFF

Output

(2 Flip Flops)

Tristate

(2 Flip Flops)

DDRCLK

Input

(5 Flip Flops)

CLKO

CLKI

CEO

CEI

Control

Muxes

LSR

GSR

LFEC10 Datasheet(PDF) 24 Page - Lattice Semiconductor

LFEC10 Datasheet(HTML) 24 Page - Lattice Semiconductor

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL