Stratix V Device Overview

ID 683258
Date 6/15/2020
Give Feedback

1.4. Low-Power Serial Transceivers

Stratix V FPGAs deliver the industry’s most flexible transceivers with the highest bandwidth from 600 Mbps to 28.05 Gbps, low bit error ratio (BER), and low power. Stratix V transceivers have many enhancements to improve flexibility and robustness. These enhancements include robust analog receiver clock and data recovery (CDR), advanced pre-emphasis, and equalization. In addition, each channel provides full featured embedded PCS hard IP to simplify the design, lower the power, and save valuable core resources.

Stratix V transceivers are compliant with a wide range of standard protocols and data rates and are equipped with a variety of signal conditioning features to support backplane, optical module, and chip-to-chip applications.

Stratix V transceivers are located on the left and right sides of the device, as shown in the figure below. The transceivers are isolated from the rest of the chip to prevent core and I/O noise from coupling into the transceivers, thereby ensuring optimal signal integrity. The transceiver channels consist of the physical medium attachment (PMA), PCS, and high-speed clock networks. You can also configure unused transceiver PMA channels as additional transmitter PLLs.

Figure 1. Stratix V GT, GX, and GS Device Chip View

This figure represents one variant of a Stratix V device with transceivers. Other variants may have a different floorplan than the one shown here.

The following table lists the PMA features for the Stratix V transceivers.

Table 7.  Transceiver PMA Features  



Chip-to-chip support

28.05 Gbps and 12.5 Gbps (Stratix V GT devices) and 14.1 Gbps (Stratix V GX and GS devices)

Backplane support

12.5 Gbps (Stratix V GX, GS, and GT devices)

Cable driving support

PCIe cable and eSATA applications

Optical module support with EDC

10G Form-factor Pluggable (XFP), Small Form-factor Pluggable (SFP+), Quad Small Form-factor Pluggable (QSFP), CXP, 100G Pluggable (CFP), 100G Form-factor Pluggable

Continuous Time Linear Equalization (CTLE)

Receiver 4-stage linear equalization to support high-attenuation channels

Decision Feedback Equalization (DFE)

Receiver 5-tap digital equalizer to minimize losses and crosstalk

Adaptive equalization (AEQ)

Adaptive engine to automatically adjust equalization to compensate for changes over time

PLL-based clock recovery

Superior jitter tolerance versus phase interpolation techniques

Programmable deserialization and word alignment

Flexible deserialization width and configurable word alignment patterns

Transmitter equalization (pre-emphasis)

Transmitter driver 4-tap pre-emphasis and de-emphasis for protocol compliance under lossy conditions

Ring and LC oscillator transmitter PLLs

Choice of transmitter PLLs per channel, optimized for specific protocols and applications

On-chip instrumentation (EyeQ data-eye monitor)

Allows non-intrusive on-chip monitoring of both width and height of the data eye

Dynamic reconfiguration

Allows reconfiguration of single channels without affecting operation of other channels

Protocol support

Compliance with over 50 industry standard protocols in the range of 600 Mbps to 28.05 Gbps

The Stratix V core logic connects to the PCS through an 8-, 10-, 16-, 20-, 32-, 40-, 64-, or 66-bit interface, depending on the transceiver data rate and protocol. Stratix V devices contain PCS hard IP to support PCIe Gen3, Gen2, Gen1, Interlaken, 10GE, XAUI, GbE, SRIO, CPRI, and GPON protocols. All other standard and proprietary protocols are supported through the transceiver PCS hard IP. The following table lists the transceiver PCS features.

Table 8.  Transceiver PCS Features 


Data Rates (Gbps)

Transmitter Data Path

Receiver Data Path

Custom PHY

0.6 to 8.5

Phase compensation FIFO, byte serializer, 8B/10B encoder, bit-slip, and channel bonding

Word aligner, de-skew FIFO, rate match FIFO, 8B/10B decoder, byte deserializer, and byte ordering

Custom 10G PHY

9.98 to 14.1

TX FIFO, gear box, and bit-slip

RX FIFO and gear box

x1, x4, x8 PCIe Gen1 and Gen2

2.5 and 5.0

Same as custom PHY plus PIPE 2.0 interface to core logic

Same as custom PHY plus PIPE 2.0 interface to core logic

x1, x4, x8 PCIe Gen3


Phase compensation FIFO, encoder, scrambler, gear box, and bit-slip

Block synchronization, rate match FIFO, decoder, de-scrambler, and phase compensation FIFO

10G Ethernet


TX FIFO, 64/66 encoder, scrambler, and gear box

RX FIFO, 64/66 decoder, de-scrambler, block synchronization, and gear box


4.9 to 14.1

TX FIFO, frame generator, CRC-32 generator, scrambler, disparity generator, and gear box

RX FIFO, frame generator, CRC-32 checker, frame decoder, descrambler, disparity checker, block synchronization, and gearbox

OTN 40 and 100

(4 +1) x 11.3

TX FIFO, channel bonding, and byte serializer

RX FIFO, lane deskew, and byte de-serializer

(10 +1) x 11.3



Same as custom PHY plus GbE state machine

Same as custom PHY plus GbE state machine


3.125 to 4.25

Same as custom PHY plus XAUI state machine for bonding four channels

Same as custom PHY plus XAUI state machine for re-aligning four channels


1.25 to 6.25

Same as custom PHY plus SRIO V2.1 compliant x2 and x4 channel bonding

Same as custom PHY plus SRIO V2.1compliant x2 and x4 deskew state machine


0.6144 to 9.83

Same as custom PHY plus TX deterministic latency

Same as custom PHY plus RX deterministic latency


1.25, 2.5, and 10

Same as custom PHY

Same as custom PHY