NXP Semiconductors PX1011A-EL1/G,557

Overview

PX1011A-EL1/G from NXP Semiconductors (formerly Philips) is a single-lane, 2.5 Gbit/s PCI Express 1.1-compliant stand-alone PHY IC. It implements full physical layer functions including clock and data recovery (CDR), 8b/10b encoding/decoding, SerDes, elastic buffer, receiver detection, and loopback. It interfaces with MACs via an 8-bit, 250 MHz SSTL_2 PXPIPE interface and connects to PCIe links via differential TX_P/TX_N and RX_P/RX_N I/Os - used in FPGA-based embedded PCIe endpoints and add-in cards requiring off-chip PHY integration.

For engineers reviewing the PX1011A-EL1/G datasheet, PX1011A-EL1/G pinout, PX1011A-EL1/G application, or PX1011A-EL1/G equivalent, key selection considerations include its LFBGA81 package, industrial-grade variant availability (PX1011AI-EL1/G), 1.2 V core supply, 2.5 V SSTL_2 I/O compliance, and support for P0/P0s/P1 power states per PCIe Base Spec 1.1.

Technical Context

The PX1011A-EL1/G implements a full PCIe 1.1 PHY stack: CDR recovers 2.5 Gbit/s serial data from differential inputs; SerDes converts 8-bit parallel data at 250 MHz to/from serial streams; 8b/10b coding ensures DC balance and transition density. Its PXPIPE interface adds source-synchronous TXCLK and RXCLK signals beyond standard PIPE v1.0 to simplify timing closure with FPGAs.

Power management includes hardware-controlled P0/P0s/P1 state transitions signaled via PWRDWN[1:0], with PHYSTATUS indicating completion. Receiver detection and polarity inversion (RXPOL) are implemented in analog/digital logic, while elastic buffer SKP insertion/removal handles ±600 ppm clock tolerance - all verified against PCIe Base Spec Rev. 1.1 compliance requirements.

Key Specifications

Pinout & Package

LFBGA81 package (9 × 9 × 1.05 mm, SOT643-1), lead-free (SnAgCu solder balls), 81-ball fine-pitch array with exposed thermal pad (not electrically connected).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PCIe PHY applications.

Compared with TSB582 and LAN9662, PX1011A-EL1/G delivers PCIe 1.1 compliance with lower power, simpler interface (no MDIO), and superior clock tolerance handling - making it optimal for FPGA-centric, thermally sensitive, or EMI-sensitive PCIe endpoint designs where minimal external components are critical.

Availability

PX1011A-EL1/G is available at Aetrix Electronics and suitable for FPGA-based PCIe endpoints, industrial backplane modules, embedded vision capture cards, and medical imaging data aggregators requiring stable component supply across long product lifecycles.

Supply support for PX1011A-EL1/G includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

NXP Semiconductors, formerly Philips Semiconductors, designs high-performance interface ICs for automotive, industrial, and communications infrastructure - with deep expertise in PCIe, USB, and Ethernet PHYs.

The PX1011A-EL1/G belongs to NXP's legacy PCI Express PHY product line, engineered specifically for FPGA-based embedded systems needing off-chip, standards-compliant, low-power PCIe physical layer integration.

FAQ

What is the operating temperature range for PX1011A-EL1/G?

The PX1011A-EL1/G is rated for commercial temperature operation from 0 °C to +70 °C. For industrial applications requiring −40 °C to +85 °C, the pin-compatible PX1011AI-EL1/G variant is available. Both share identical electrical specifications and pinout, differing only in temperature screening and marking.

Does PX1011A-EL1/G support PCIe 2.0 or higher?

No, PX1011A-EL1/G is compliant only with PCI Express Base Specification Rev. 1.0a and Rev. 1.1 (2.5 Gbit/s). It does not support PCIe 2.0 (5.0 Gbit/s) or later generations. Attempting to operate it at higher data rates will result in link training failure and loss of synchronization.

How is the PX1011A-EL1/G powered, and what are the supply voltage requirements?

PX1011A-EL1/G requires five independent supplies: VDD = 1.2 V (high-speed I/O), VDDD3 = 1.25 V (core), VDDD2 = 2.5 V (SSTL_2 I/O), VDDD1 = 3.3 V (JTAG), and dual analog rails VDDA1 = 1.25 V and VDDA2 = 3.3 V. Each supply must meet ripple and sequencing requirements specified in Section 8.12 of the datasheet to ensure stable CDR lock and SerDes operation.

Can PX1011A-EL1/G perform lane polarity inversion, and how is it controlled?

Yes, PX1011A-EL1/G supports hardware-controlled lane polarity inversion via the RXPOL input pin (J4). When asserted high, the PHY inverts received data within ≤20 symbol periods. This feature compensates for reversed PCB trace routing or flipped connectors without requiring MAC-layer reconfiguration or firmware updates.

What is the function of the elastic buffer in PX1011A-EL1/G, and how does it affect system timing?

The elastic buffer in PX1011A-EL1/G compensates for ±600 ppm frequency differences between link partners by inserting or removing SKP ordered sets. It maintains data integrity across clock domains and outputs status via RXSTATUS signals - enabling the MAC to adjust buffer pointers in real time without introducing fixed latency or requiring software polling.