ORT82G5-1BM680C LATTICE [Lattice Semiconductor], ORT82G5-1BM680C Datasheet - Page 11

• Manufacturer Part Number: ORT82G5-1BM680C
• Description: 0.6 to 3.7 Gbps XAUI and FC FPSCs
• Manufacturer: LATTICE [Lattice Semiconductor]

Lattice Semiconductor
Additional Information
Contact your local Lattice representative for additional information regarding the ORCA Series 4 FPGA devices, or
visit the Lattice web site at www.latticesemi.com.
ORT42G5/ORT82G5 Overview
The ORT42G5 and ORT82G5 FPSCs provide high-speed backplane transceivers combined with FPGA logic. They
are based on the 1.5V OR4E04 ORCA FPGA and have 36 x 36 arrays of Programmable Logic Cells (PLCs). The
embedded core, which contains the backplane transceivers is attached to the right side of the device and is inte-
grated directly into the FPGA array. A top level diagram of the basic chip configuration is shown in Figure 1.
Embedded Core Overview
The embedded core portions of the ORT42G5 and ORT82G5 contain respectively four or eight Clock and Data
Recovery (CDR) macrocells and Serialize/Deserialize (SERDES) blocks and support 8b/10b ( IEEE 802.3.2002)
encoded serial links. It is intended for high-speed serial backplane data transmission. Figure 1 shows the
ORT42G5 and ORT82G5 top level block diagram and the basic data flow. Boundary scan for the
ORT42G5/ORT82G5 only includes programmable I/Os and does not include any of the embedded block I/Os.
Figure 1. ORT42G5/ORT82G5 Top Level Block Diagram
The serial channels can each operate at up to 3.7 Gbps (2.96 Gbps data rate) with a full-duplex synchronous inter-
face with built-in clock recovery (CDR). The 8b/10b encoding provides guaranteed ones density for the CDR, byte
alignment, and error detection. The core is also capable of frame synchronization and physical link monitoring and
contains independent 4k x 36 RAM blocks. Overviews of the various blocks in the embedded core are presented in
the following paragraphs.
Serializer and Deserializer (SERDES)
The SERDES portion of the core contains two transceiver blocks for serial data transmission at a selectable data
rate of 0.6 to 3.7 Gbps. Each SERDES channel features high-speed 8b/10b parallel I/O interfaces to other core
blocks and high-speed CML interfaces to the serial links.
The SERDES circuitry consists of receiver, transmitter, and auxiliary functional blocks. The receiver accepts high-
speed (up to 3.7 Gbps) serial data. Based on data transitions, the receiver locks an analog receive PLL for each
channel to retime the data, then demultiplexes the data down to parallel bytes and an accompanying clock.
The transmitter operates in the reverse direction. Parallel bytes are multiplexed up to 3.7 Gbps serial data for off-
chip communication. The transmitter generates the necessary 3.7 GHz clocks for operation from a lower speed ref-
erence clock.
STANDARD
FPGA I/Os
FPGA LOGIC
SERIES 4
ORCA
AND MULTI-CHANNEL
DECODER/ENCODER
4:1 MUX/1:4 DEMUX
ALIGNMENT FIFOs
8b/10b
11
ORCA ORT42G5 and ORT82G5 Data Sheet
BYTE-
DATA
WIDE
CLOCK/DATA
RECOVERY
SERDES w/
CML
I/Os
4 or 8 FULL-
CHANNELS
0.6 Gbps
3.7 Gbps
0.6 Gbps
3.7 Gbps
DUPLEX
SERIAL
DATA
DATA
TO
TO