5SGXEA7H2F35I3LN: Intel Stratix V GX FPGA Design Guide

5SGXEA7H2F35I3LN: Two Characters That Define Half the Architecture — and Most Designers Miss One of Them

The part number 5SGXEA7H2F35I3LN is 17 characters long. Two of those characters — E and H2 — define the most architecturally significant aspects of this specific FPGA, and they are the two fields that are most often misunderstood or overlooked when specifying this device.

The E distinguishes this from the 5SGXMA7 (the mainstream variant with one PCIe hard IP block). The E suffix means Extended PCIe — two or four PCIe hard IP blocks in the device rather than one, depending on the package. In the F35 (1152-pin) package, the 5SGXEA7 provides two PCIe Gen3 hard IP blocks, each capable of ×8 lane operation. This matters for line card applications, network processing systems, or any design where two independent PCIe interfaces are needed — either for host-to-FPGA plus FPGA-to-back-end connectivity, or for multi-host systems where the FPGA bridges traffic between two PCIe fabric segments.

The H2 defines the transceiver channel variant. Stratix V GX devices offer up to 66 integrated transceivers with 14.1-Gbps data rate capability. The specific H2 configuration in the A7 device with F35 package selects a subset of those channels — in this case, 48 active GX transceiver channels — while leaving certain transceiver banks in a powered-down or limited-capability state. A design that assumes all 66 theoretical maximum transceiver channels are available will fail when the H2 variant's active channel count is discovered during pin assignment.

Understanding these two characters before beginning a PCB layout or IP allocation saves weeks of design rework.

1.0 Part Number Decoded: 5SGXEA7H2F35I3LN Character by Character

Intel (formerly Altera) Stratix V part numbers encode the device family, variant, density, transceiver configuration, package, speed grade, temperature, lead finish, and optional features in a structured string:

5 — Device generation: 5 = Stratix V (28nm process node). Stratix IV was 40nm; Stratix 10 uses Intel's 14nm tri-gate process.

S — Product family: S = Stratix (Intel's highest-performance FPGA family line, above Arria and Cyclone)

GX — Device variant within Stratix V:

• GT = Transceivers up to 28.05 Gbps (ultra-high bandwidth, 40G/100G optical)
• GX = Transceivers up to 14.1 Gbps (high bandwidth, 10G/40G optical, backplane)
• GS = DSP-optimized with transceivers up to 14.1 Gbps
• E = Logic-only, no transceivers (highest logic density)

E — PCIe Hard IP variant:

• M (Mainstream) = One PCIe Gen3 hard IP block instantiation
• E (Extended) = Two or four PCIe Gen3 hard IP block instantiations, depending on package. In the F35 (1152-pin) package, the EA7 provides two PCIe Gen3 hard IP blocks. This is the key architectural differentiator from the 5SGXMA7.

A7 — Device density:

• A = density tier A (largest in the GX family for standard packages)
• 7 = density sub-level: 622,000 Logic Elements (LEs), 234,720 Adaptive Logic Modules (ALMs)

H2 — Transceiver channel configuration:

• This field selects which subset of the device's maximum transceiver channels are enabled and at what rate
• H = specific channel grouping in the transceiver bank layout
• 2 = specific configuration variant within the H grouping
• Result for this part: 48 GX transceiver channels active at up to 14.1 Gbps. Check Intel's Stratix V device pin-out and transceiver channel tables for the exact channel mapping in the F35 package for the H2 configuration.

F35 — Package:

• F = FC-FBGA (Flip-Chip Fine-pitch Ball Grid Array)
• 35 = 35 mm × 35 mm package body
• Pin count: 1,152 pins (FC-FBGA 1152)

I — Temperature grade:

• I = Industrial temperature: −40°C to +100°C junction temperature
• C = Commercial: 0°C to +85°C junction

3 — Speed grade:

• 3 = Speed grade 3 (slowest for the Stratix V I-temp family; grades run −1, −2, −3 from fastest to slowest for commercial, and different numbering for industrial)
• The I3 combination specifies industrial temperature with the grade-3 timing set

L — Lead finish: L = Lead-free, RoHS-compliant

N — Embedded HardCopy option: N = No embedded HardCopy block instantiation in this ordering code

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2.0 Specifications at a Glance

From Intel's Stratix V 5SGXA7 product page and Stratix V Device Overview (SV51001, June 2020), applicable to the EA7 density with F35 package:

Logic fabric:

• Logic Elements (LE): 622,000
• Adaptive Logic Modules (ALM): 234,720
• Each ALM contains an 8-input fracturable LUT, 2 dedicated embedded adders, and 4 registers (vs 2 registers in Stratix IV ALMs)
• ALM registers total: 938,880
• Target design frequency: up to 800 MHz fabric operations (design-dependent)

Memory:

• M20K embedded memory blocks: up to ~2,567 blocks × 20 Kb = approximately 57 Mb total embedded block RAM
• M20K blocks configurable as single-port RAM, true dual-port RAM, ROM, FIFO
• Additional MLAB (Memory Logic Array Block) distributed RAM from LUT fabric

DSP:

• Variable-Precision DSP blocks: 256
• Each DSP block supports: 9×9, 12×12, 18×18, 27×27 multipliers, and 18×25 multiply-accumulate in hardware
• Hardened floating-point operators available via chained DSP block modes
• Peak 18×18 multiply-accumulate performance: approximately 256 × 2 × clock_frequency operations/second

Transceivers (H2 configuration, F35 package):

• Active GX channels: 48 (up to 14.1 Gbps per channel)
• Total aggregate transceiver bandwidth: 48 × 14.1 Gbps = approximately 677 Gbps full-duplex
• Transceiver features: programmable pre-emphasis, adaptive equalization, electronic dispersion compensation (EDC), built-in PRBS generator/checker, dynamic reconfiguration
• Supported protocols: PCIe Gen1/2/3, 10GbE, 40GbE (4 lanes), CPRI, OBSAI, Serial RapidIO, SONET/SDH, Interlaken, XAUI, and custom serial

PCIe Hard IP (Extended variant — the E in 5SGXE):

• 2× PCIe Gen3 hard IP blocks in F35 package (vs 1× in mainstream 5SGXM variant)
• Each block: PCIe Gen1/2/3, ×1/×2/×4/×8 lane width, hardened data link layer and transaction layer
• Configuration via Protocol (CvP): the FPGA core bitstream can be loaded over an established PCIe link, enabling a simpler board design with no dedicated configuration flash in the mainboard

Clocking:

• Fractional PLLs (fPLLs): 28 total
• fPLLs support fractional-N frequency synthesis, enabling elimination of external VCXOs
• Global, quadrant, and regional clock distribution networks

I/O:

• Maximum user I/O: 840 pins in F35 package (not including transceiver pins)
• Maximum LVDS pairs: 420
• I/O standard support: 1.2V–3.0V LVCMOS, SSTL, HSTL, HSUL, LVDS, LVPECL, BLVDS, differential standards
• External memory interfaces: DDR3, DDR2, QDR II+, RLDRAM 3

Process and power:

• Process node: 28 nm (Intel/TSMC 28nm HPM process)
• Core voltage (VCCINT): 0.85V (nominal)
• Power reduction vs Stratix IV: approximately 30% lower total power

Temperature and package:

• Junction temperature (I-grade): −40°C to +100°C
• Package: FC-FBGA, 1152 pins, 35 mm × 35 mm, 1.0 mm ball pitch

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3.0 Architecture: ALMs, Variable-Precision DSP, and the Extended PCIe Difference

The ALM — Stratix V's logic building block:

Stratix V devices use an improved ALM to implement logic functions more efficiently. The Stratix V ALM has eight inputs with a fracturable look-up table (LUT), two dedicated embedded adders, and four dedicated registers. The four registers per ALM (doubled from Stratix IV's two) are particularly significant for register-heavy, heavily pipelined designs — common in high-frequency networking and DSP applications. More registers per logic cell means the place-and-route tool can pipeline critical paths without consuming additional logic cells, making it easier to close timing at high clock frequencies.

The fracturable LUT implementation means each ALM can operate as one 6-input LUT, two independent 4-input LUTs, or a 5-input LUT plus an independent 3-input LUT — adapting to the actual logic function being implemented rather than wasting resources on fixed-input LUT configurations.

Variable-Precision DSP blocks:

The redesigned adaptive logic module (ALM), 20 Kbit (M20K) embedded memory blocks, variable precision DSP blocks, and fractional phase-locked loops (PLLs) form the common core of all Stratix V variants. The variable-precision DSP blocks distinguish Stratix V from earlier generations: rather than fixed 18×18 multipliers, each Stratix V DSP block supports multiple precision modes from 9×9 to 27×27, including a hardened single-precision floating-point mode when DSP blocks are chained. For applications like software-defined radio, radar processing, or financial analytics that mix fixed and floating-point computation, this flexibility eliminates the logic overhead of implementing multiple precision levels in fabric.

The Extended PCIe architecture (E variant):

Stratix V mainstream "M" devices have exactly one instantiation of PCI Express hard IP. Extended "E" devices have either two or four instantiations of PCI Express hard IP, depending on the device and package combination.

In the 5SGXEA7 with F35 (1152-pin) package, this means two PCIe Gen3 hard IP blocks, each supporting up to ×8 lanes. The practical impact: a single FPGA can simultaneously present two independent PCIe Gen3 ×8 endpoints to two different host systems, or one endpoint to a host while maintaining a second as a root port toward downstream devices — without consuming any user logic for PCIe protocol implementation.

This architecture enables designs that would otherwise require either a PLX/Broadcom PCIe switch plus a single-endpoint FPGA, or two separate FPGAs. For network processor cards that must interface to a host server via PCIe while simultaneously managing fabric connectivity to a backplane switch via a second PCIe interface, the 5SGXEA7 consolidates what would otherwise be a two-chip solution.

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4.0 ⚠️ Four Pitfalls in 5SGXEA7H2F35I3LN Designs

Pitfall 1: Treating all transceiver channels as equal and available

The H2 transceiver configuration does not enable all physical transceiver sites on the die uniformly. Stratix V GX devices organize transceivers into blocks of 6 channels each, with certain blocks dedicated to supporting the PCIe hard IP (those channels are "consumed" by the PCIe lanes and are not available as general-purpose serial links). In the H2 configuration of the F35 package, the channel allocation between PCIe-dedicated and user-available channels must be carefully mapped using Intel's channel availability table before assigning serial protocol pins. A design that assigns user-defined protocols to channels that turn out to be PCIe-dedicated will fail pin assignment in Quartus.

Pitfall 2: Underestimating VCCINT current demand and PDN complexity

The 5SGXEA7 at 622K LEs with 48 active transceivers and dual PCIe hard IP is a large, power-hungry device. The 0.85V VCCINT supply must deliver peak currents that can exceed 40–60A for a heavily loaded design at high clock frequencies. The PCB power delivery network (PDN) for VCCINT requires multiple low-ESR bulk capacitors (47–100 µF per supply point), extensive high-frequency ceramic decoupling at every VCCINT pin, and a power plane with sufficiently low impedance to prevent mid-frequency resonances. Use Intel's PowerPlay Power Analyzer (in Quartus) to estimate the expected VCCINT current based on your specific design's resource utilization and toggle rates — then use the PDN Tool to verify the decoupling network impedance profile. A poorly designed PDN produces intermittent logic errors at high utilization that are difficult to distinguish from functional bugs.

Pitfall 3: Configuring with CvP without understanding the fallback requirements

Configuration via Protocol (CvP) allows the FPGA's core bitstream to be loaded over an established PCIe link, eliminating a dedicated configuration flash device. This is a genuine board simplification. However, CvP requires that the PCIe link be established first using a "wrapper" configuration image stored in a small SPI flash — the full core design is then loaded over PCIe from the host. If the CvP loading fails (incomplete transfer, host software error, power loss during loading), the FPGA remains in the wrapper state with no core functionality. A robust CvP design must include a fallback path — either a second SPI flash with a safe recovery image, or a host-side mechanism to retry the CvP load. Designs that use CvP without a fallback strategy risk field units being unrecoverable without physical intervention.

Pitfall 4: Assuming I-grade (industrial temperature) eliminates the need for thermal management

The I-grade rating specifies −40°C to +100°C junction temperature — a wider range than the commercial-grade's 0°C to +85°C. This does not mean the device is self-cooling at high ambient temperatures. A 5SGXEA7 at high utilization dissipates 15–25W depending on design. With a package thermal resistance (θJA) of approximately 3–5°C/W for the FC-FBGA 1152 in a forced-air environment, at 25W dissipation and 70°C ambient: Tj = 70 + (25 × 4) = 170°C — far above the 100°C maximum junction temperature. An industrial-temperature FPGA at this density absolutely requires active cooling (heatsink + forced air or liquid cooling for the most demanding designs). The I-grade provides guaranteed silicon performance at cold temperatures and extended characterization range; it does not provide passive thermal operation at elevated ambient.

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5.0 Power, Configuration, and PCB Design Notes

Power supply domains:

The 5SGXEA7 requires multiple power supply domains. Key supplies and their specifications:

Supply	Nominal voltage	Function
VCCINT	0.85V ± 3%	Core logic fabric
VCCPD	1.8V	Pre-driver for I/O buffers
VCCA	2.5V	Analog supply for PLLs
VCCL_GXB	1.1V	GX transceiver analog
VCCT_GXB	1.5V	GX transceiver TX termination
VCCR_GXB	1.5V	GX transceiver RX termination
VCCIO_x	Bank-configurable	I/O buffers (1.2V–3.3V per bank)

Power-up sequence: VCCINT must reach its operating range before VCCIO rails are applied. Intel's AN 692 documents the required sequencing for Stratix V and Agilex devices.

Configuration options:

Beyond CvP (described above), the 5SGXEA7 supports:

• Active Serial (AS): Single or quad SPI flash connected to dedicated AS pins. Standard approach for most designs. Configuration time depends on flash size and SPI clock speed.
• Fast Passive Parallel (FPP): Faster configuration via an 8- or 16-bit parallel bus from an external controller or CPLD. Used when configuration time must be minimized.
• JTAG: For programming and debugging. Always available regardless of primary configuration mode.

PCB design considerations for FC-FBGA 1152:

The 35mm × 35mm, 1152-ball, 1.0mm pitch package requires at minimum an 8-layer PCB to route all signals — in practice, 12–16 layers are common for this device density. Key PCB rules: Controlled Impedance: Most Altera FPGA I/O standards require 50Ω single-ended or 100Ω differential impedance. The transceiver differential pairs (GXB_TX/RX) require 100Ω differential impedance, matched length within ±10 mil, with AC coupling capacitors (100 nF C0G) at the FPGA package side. Use Intel's PowerPlay and PDN Tool for power estimation and decoupling verification.

Quartus software:

The design toolchain for 5SGXEA7H2F35I3LN is Intel Quartus Prime Pro Edition (for Stratix V, Quartus II version 13.1 or later is the original tool; Quartus Prime Pro 16.0 and later fully supports Stratix V with updated IP). Intel's Stratix V, Arria 10: Available through 2035 — product longevity is confirmed through at least 2035, which is relevant for selecting this device in designs with long production requirements.

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6.0 Variant Comparison: E vs M, H2 vs Other Transceiver Configs, Speed Grades

Extended (E) vs Mainstream (M) PCIe hard IP:

Variant	PCIe hard IP blocks	F35 package	F40 package
5SGXEA7 (this part)	2× PCIe Gen3	2 blocks	4 blocks
5SGXMA7	1× PCIe Gen3	1 block	1 block

Transceiver channel configurations for A7, F35 package:

Config code	Active GX channels	Notes
H2 (this part)	48	Most common for multi-protocol designs
N2	Varies	Alternative channel subset
K2	Varies	Alternative channel subset

Always verify the exact active channel count and location from Intel's Stratix V Channel Availability Guide for the specific device/package/config combination.

Speed grade and temperature combinations:

Suffix	Temp grade	Speed	Tj range	Availability
I3 (this part)	Industrial	Grade 3 (slowest)	−40°C to +100°C	Standard
I2	Industrial	Grade 2	−40°C to +100°C	Selected
C3	Commercial	Grade 3	0°C to +85°C	Wide
C2	Commercial	Grade 2	0°C to +85°C	Standard

Migration path to newer Intel FPGA families:

Intel has committed to Stratix V availability through 2035. For new designs requiring higher performance or lower power: the Stratix 10 (14nm) provides up to 2× performance over Stratix V with the Intel Hyperflex architecture. Intel® Stratix® 10 FPGA and SoC FPGA deliver innovative advantages in performance, power efficiency, density, and system integration. Migration from Stratix V to Stratix 10 requires a full PCB redesign (different package, different power domains, different transceiver rates) but the Quartus toolchain supports both families.

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7.0 Sourcing 5SGXEA7H2F35I3LN

The 5SGXEA7H2F35I3LN is an active Intel production part. Intel FPGAs are sold through authorized distribution (Arrow, Avnet, Mouser for volume; DigiKey for lower quantities) and directly through Intel's FPGA sales channel for design wins with volume commitments.

NDA and documentation access: Intel's detailed Stratix V device handbooks (transceiver user guides, pin-out files, power analysis guidelines) are publicly available on Intel's website. The full datasheet with electrical specifications is also public. No NDA is required for evaluation, unlike some competing vendor products. The Quartus Prime software (required for design) is available as a licensed download from Intel; web-accessible free licenses exist for smaller Cyclone/MAX devices but Stratix V requires a paid license or Intel Design Center access.

Counterfeit risk: High-density Intel FPGAs in the secondary market carry counterfeit risk. The physical package marking alone is insufficient to verify authenticity — a genuine 5SGXEA7 programmed as a different density device (with JTAG-accessible IDCODE) is detectable via Quartus. Verify JTAG IDCODE on received parts before committing to production PCB loading. The IDCODE for 5SGXEA7 is documented in the Stratix V JTAG specification.

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8.0 Real Questions from FPGA Engineers

Q: I need two independent PCIe Gen3 ×8 interfaces in my design. Can the 5SGXEA7H2F35I3LN support this, and how do the transceiver channels map between the two PCIe blocks?

A: Yes, this is precisely the use case the E (Extended) variant is designed for. In the F35 package, the 5SGXEA7E provides two PCIe Gen3 hard IP blocks. Each block occupies 8 GX transceiver channels for ×8 operation, meaning 16 of the 48 available H2 channels are consumed by the two PCIe hard IP blocks. The remaining 32 channels are available for user-defined serial protocols (10GbE, CPRI, SONET, etc.). The physical location of the two PCIe blocks (left side, right side of the die) determines which transceiver banks are associated with each PCIe interface — this affects PCB layout, since the PCIe edge connector or backplane connectors for each interface must route to the corresponding transceiver bank. Download Intel's Stratix V GX channel availability guide and the F35 package pin-out to map the exact transceiver-to-PCIe-block assignment before starting PCB layout.

Q: The design requires the FPGA to operate in an enclosure reaching 85°C ambient. What cooling is required for 5SGXEA7H2F35I3LN?

A: At 85°C ambient with a typical design dissipating 15–20W: thermal resistance from junction to ambient (θJA) for the FC-FBGA 1152 in still air is approximately 8–12°C/W; with a heatsink and moderate airflow (1–2 m/s), θJC_heatsink can be reduced to approximately 1–3°C/W. Target: Tj must stay below 100°C (I-grade limit). With a heatsink achieving θJC = 2°C/W and 20W dissipation: Tj = 85 + (20 × 2) + junction-to-case_package ≈ 85 + 40 + 5 = 130°C — still exceeding the limit. This calculation shows that at 85°C ambient with a high-utilization 5SGXEA7, active cooling is mandatory. Practical solutions: a copper heatsink with 30–50 CFM of direct airflow achieving θJC_effective ≈ 1.0–1.5°C/W, which brings Tj ≈ 85 + 20 + 5 = 110°C — still marginal. Use Intel's PowerPlay to obtain the actual power for your specific design utilization, and verify thermal margins with the actual heatsink/airflow combination planned.

Q: Quartus II vs Quartus Prime Pro — which software version should be used for a new 5SGXEA7 design starting today?

A: Use Quartus Prime Pro Edition for any new Stratix V design. While Quartus II (versions 13.1 through 15.1) was the original tool for Stratix V, Intel has since integrated Stratix V support into Quartus Prime Pro starting with version 16.0. Quartus Prime Pro provides updated synthesis, place-and-route optimizations, improved timing analysis, and access to current Intel IP cores that are not available in the older Quartus II tool. For designs that need to maximize performance and minimize compile time on the 5SGXEA7, Quartus Prime Pro's incremental compilation and optimization features provide meaningful benefits over legacy Quartus II. Ensure the license covers Stratix V (the Pro Edition subscription license covers all Intel FPGA families including Stratix V).

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9.0 Quick Reference Card

Part Number Decode:

Field	Value	Meaning
5	5	Stratix V, 28nm
SGXE	SGXE	Stratix V GX, Extended PCIe
A7	A7	622,000 LEs / 234,720 ALMs
H2	H2	48 active GX transceiver channels
F35	F35	FC-FBGA 1152-pin, 35×35mm
I	I	Industrial: −40°C to +100°C Tj
3	3	Speed grade 3 (conservative)
L	L	Lead-free, RoHS
N	N	No embedded HardCopy

Key Resources:

Resource	Count
Logic Elements (LE)	622,000
Adaptive Logic Modules (ALM)	234,720
ALM Registers	938,880
M20K Embedded Memory Blocks	~2,567 (≈ 57 Mb)
Variable-Precision DSP Blocks	256
Fractional PLLs	28
GX Transceivers (H2, active)	48 × 14.1 Gbps
PCIe Gen3 Hard IP (E variant)	2 blocks (vs 1 in M variant)
Maximum User I/O (F35 pkg)	840

E vs M — The Key Architectural Difference:

	5SGXEA7 (this part)	5SGXMA7
PCIe hard IP blocks	2 (F35 pkg)	1
Use case	Dual-host, bridge, multi-fabric	Single PCIe root/endpoint
Transceiver overhead	16 channels for PCIe	8 channels for PCIe

Power Supply Summary:

Rail	Voltage	Function
VCCINT	0.85V (high current, 40–60A peak)	Core logic
VCCPD	1.8V	I/O pre-driver
VCCA	2.5V	PLL analog
VCCL_GXB	1.1V	Transceiver analog
VCCT/R_GXB	1.5V	Transceiver termination
VCCIO	Per-bank configurable	I/O buffers

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