Texas Instruments XIO1100GGB

Overview

XIO1100GGB from Texas Instruments is a PCI Express 1.1-compliant PHY device implementing the TI-PIPE MAC interface, supporting 2.5 Gbps serial link operation with differential TXP/TXN and RXP/RXN I/O, 100/125 MHz reference clock selection, and dual-mode (8-bit DDR / 16-bit SDR) parallel interface. It serves as the physical layer bridge between PCIe MAC logic and serial link in embedded host controllers and add-in cards.

For engineers reviewing the XIO1100GGB datasheet, XIO1100GGB pinout, XIO1100GGB application, or XIO1100GGB equivalent, key selection criteria include TI-PIPE interface configuration (DDR_EN, CLK_SEL), power state control (POWERDOWN[1:0]), elastic buffer SKP handling, 8B/10B decode error reporting via RX_STATUS[2:0], and GGB BGA package compatibility with PCIe layout guidelines.

Technical Context

The XIO1100GGB implements a modified PIPE interface-TI-PIPE-with source-synchronous TX_CLK and RX_CLK clocks, unlike Intel's single-clock PIPE. It supports two operational modes: 125 MHz 16-bit SDR (when DDR_EN = low) and 250 MHz 8-bit DDR (when DDR_EN = high), both compliant with PCIe Base Specification 1.1.

It performs full 8B/10B encoding/decoding and scrambling/unscrambling, recovers receiver clock from data transitions, and incorporates an elastic buffer with ±600 ppm clock tolerance compensation using SKP ordered-sets. Power management includes three defined states-P0 (full operation), P0s (TX idle), and P1 (both TX/RX idle)-with PHY_STATUS signaling for state transition completion.

Key Specifications

Pinout & Package

The XIO1100GGB is housed in a 100-pin MicroStar BGA (GGB) package with 0.8 mm pitch, designed for high-speed PCIe signal integrity and thermal dissipation in compact board layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT8N34S01BGI and PI7C9X2G304SVDEX, the XIO1100GGB uniquely delivers a dedicated, pin-configurable TI-PIPE PHY in a compact GGB package-enabling direct MAC interfacing, full 8B/10B processing, and PCIe 1.1 LTSSM compliance without added silicon layers or clock tree complexity.

Availability

XIO1100GGB is available at Aetrix Electronics and suitable for PCIe add-in cards, embedded host controllers, and diagnostic equipment requiring stable component supply, long-term lifecycle support, and verified signal integrity performance.

Supply support for XIO1100GGB 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

Texas Instruments is a global semiconductor company specializing in analog, embedded processing, and connectivity solutions, with decades of leadership in high-speed interface IP and PHY design.

The XIO1100GGB belongs to TI's PCI Express PHY product line, engineered specifically to simplify PCIe 1.1 integration for FPGA- and ASIC-based host controllers through the TI-PIPE interface and robust power-aware link training support.

FAQ

What is the function of the DDR_EN pin on the XIO1100GGB?

The DDR_EN pin configures the TI-PIPE interface mode during /RESET deassertion: when low, it enables 16-bit SDR operation at 125 MHz; when high, it enables 8-bit DDR operation at 250 MHz. This setting determines how TX_DATA[15:0] and RX_DATA[15:0] are sampled relative to TX_CLK and RX_CLK, directly impacting MAC timing constraints and PCB routing. The XIO1100GGB does not support runtime reconfiguration of DDR_EN.

How does the XIO1100GGB handle clock tolerance between link partners?

The XIO1100GGB uses an elastic buffer with SKP ordered-set tracking to compensate for ±600 ppm clock frequency differences. Upon detecting COM (0xBC) + SKP (0x1C) symbols, it inserts or removes SKP symbols to prevent buffer overflow or underflow. The RX_STATUS[2:0] bus signals "Add SKP" (001b) or "Remove SKP" (010b) in the same RX_CLK cycle as the COM symbol, enabling MAC-level synchronization response. This mechanism is fully implemented in hardware and requires no MAC intervention.

What power states does the XIO1100GGB support, and how are they controlled?

The XIO1100GGB supports three power states-P0 (full operation), P0s (TX idle), and P1 (TX+RX idle)-selected via POWERDOWN[1:0] (L9/M9). State transitions are acknowledged by a single-cycle PHY_STATUS pulse. In P1, optional P1_SLEEP (M10) can disable RX_CLK to reduce power further, but only when asserted in P1 and cleared before exit. The XIO1100GGB does not support P2 or beacon states per PCIe 1.1 specification.

Can the XIO1100GGB operate with both 1.5 V and 1.8 V I/O voltages?

Yes-the XIO1100GGB's TI-PIPE interface voltage is determined by VDD_IO: 1.5 V supplies configure LVCMOS15 I/O levels, while 1.8 V supplies configure LVCMOS18 levels. This selection is static and must match the connected MAC's I/O voltage. VDD_IO pins (F3, K3, L7, C5) must be decoupled per Section 5.3 of the datasheet; mixing voltages on these pins is not permitted and may damage the XIO1100GGB.

What is the role of the RX_STATUS[2:0] signals in the XIO1100GGB?

RX_STATUS[2:0] is a 3-bit status bus that reports real-time receive-side events on the rising edge of RX_CLK. It encodes eight conditions-including 8B/10B decode error (100b), elastic buffer overflow (101b), underflow (111b), disparity (111b), SKP add (001b), and SKP remove (010b)-with strict priority ordering. The XIO1100GGB asserts these codes for exactly one RX_CLK cycle at the earliest possible point in the data stream, enabling precise MAC-level error handling without protocol stack dependency.