System Solution

Brite 16Gbps PCIe PHY and controller solution provide high efficient interconnection that is optimized for PPA performance. The System can support short-reach or long-reach channels for plenty application scenarios. Besides the high performance of the PHY with its high line rate, low latency operation is a key feature of the PCIe PHY. The PHY supports data rate from 2.5Gbps to 16Gbps to cover PCIe Gen4.0/3.0/2.0/1.0.  The common high-speed LC-PLL clock generation can supply clock up to 8+ lanes depending on jitter requirement, so that flexible macro configuration of e.g. 1x,2x,4x,8x are possible. The top-level block diagram of the PCIe PHY is shown in figure 1.

Brite PCIe controller to AXI architecture is shown in figure 2. It provides a high-performance, easy-to-use interconnect solution between PCI Express and the latest version of the AXI protocol. It inherits the leading architecture and features an AXI user interface with built-in DMA, compliant with the AMBA® AXI3 and AXI4 specifications.

 Figure 1:  Brite PCIE PHY Block Diagram

Figure 2:    PCIE Controller to AXI Architecture

Controller Features:

  • x1, x2, x4, x8, x16 PCI Express Core

  • Supports link rate of 2.5, 5.0, 8.0 and 16.0 per lane

  • 8-bit, 16-bit, 32-bit, 64-bit and 128-bit PIPE interface

  • PHY Interface for PCI Express (PIPE), Revision 4.4.1 compliant

  • PCI Express® Base Specification Revision 4.0 v1.0 compliant

  • 4 KByte maximum payload size

  • 1 Virtual Channel (VC)

  • Lane reversal support

  • Integrated Clock Domain Crossing (CDC) to support user-selected frequency for the Bridge

  • Optional AXI4-Lite Slave interface for Bridge Configuration

  • Optional AXI4-Lite Master interface for External Registers Configuration

PHY Features:

  • Metal stack 1P9M, and above

  • Constant latency of 1.5-word clocks

  • Maximum 35db Insertion loss support

  • Flexible macro configurations

  • Maximum x8 support with a single CMU

  • Self-adaption of all major calibration and adaptive processes supported for robust performance

  • Software control and override of all auto-adaption processes supported

  • Support for both common reference clock and Separate Reference Clock without SSC (SRNS)

  • SSC supported

  • Max. of +/-300ppm frequency offset for separate reference clock mode

  • On-die Eye Monitor for RX performance and TX-to-RX loopback performance

  • DIR mode for link EQ training supported (PIPE)

       - RX eye monitor implemented

  • Fully compliant with PCIE Express Base 4.0, PCI Express Base 3.1/2.1/1.1 electrical specifications

  • PIPE Revision 4.4.1 compliant

  • Different loopback modes: near-end serial, far-end parallel