NAT-MCH - Mezzanine Modules

NAT-MCH - Mezzanine Modules

Flexible configuration options for the NAT-MCH MicroTCA Carrier Hub

The NAT-MCH can be comfortably equipped with different Fat Pipe Fabric modules for PCIe Gen 3, SRIO Gen 2 and XAUI/10/40GbE fullfilling the demand for high performance data paths within a MicroTCA system. Different clocking options provide all clock signals for telecom and non-telcom applications. These flexible configuration options make the NAT-MCH the ideal choice for any kind of application.

The following Mezzanine options are available:
  • Clock Mezzanine
    • PCIe Gen 3 Switch
    • Telecom and Fabric Clocks
    • Clock for Physics
  • GbE Switch and XAUI and 10/40GbE Support
  • SRIO Gen 2 Switch
  • Custom Protocol Switch (based on Xilinx Kintex-7 FPGA)

NEW: NAT-MCH in double-width with µRTM COM Express Carrier


Key features
Technical details
Block diagram
Order code

Clock Mezzanine

The Clock Mezzanine Module allows a flexible selection of the telecom and non-telecom clocking structures as defined in MicroTCA.0. The on-board Stratum 3/3E type PLL sources its clock reference configurably from either any of the 12 AMCs or from an external clock via the front panel BNC type connector.

In conjunction with the PCIe Hub module it provides a PCIe compliant fabric clock (FCLKA) to all AMC slots. This can be either a 100MHz fixed or 100MHz Spread Spectrum clock (SSC) at HCSL signaing level.

Key Features:
  • Support for AMC clocks CLK1, CLK2 and CLK3 for up to 12 AMCs
  • Update clock for a second NAT-MCH in a redundant system
  • Reference clock In/Output on front panel
  • Stratum 3/3E type PLL clock source for telecom applications
  • Variable switching and distribution of clocks by on-board FPGA
  • Reference for the Stratum 3/3E PLL can be either CLK1 or CLK2 from any AMC or sourced from the front panel
  • PCI Express compliant clock signal can be distributed via CLK3 to all 12 AMCs


Physics Clock Mezzanine

Beside the standard clock mezzanine, N.A.T. offers a clock mezzanine for Physics. The development of this module is driven by the demand of physics groups requiring very low jitter and constant latency. These features are realised by using a special Clock Multiplexer developed in cooperation with IDT (Integrated Device Technology Inc.).

Key features:
  • CLK1 connections for all 12 AMC multiplexed by one device
  • CLK2 connections for all 12 AMC multiplexed by one device
  • Two direct multiplexer interconnections
  • Fixed low jitter reference clock
  • Connection to front panel clock interfaces
  • PCIe reference clock distribution for 12 AMCs via CLK3 (AMC.0 R2.0 - FCLKA)


PCIe Gen 3 Switch

The PCI Express Switching Mezzanine is an AMC.1 compliant module for the NAT-MCH that enables users to add scalable high bandwidth, non-blocking interconnection to a wide variety of applications including servers, storage, video streaming, blade servers and embedded control products.
The PCIe Hub module supports full non-transparent bridging functionality to allow implementation of multi-host systems and intelligent I/O modules in applications such as communications, storage and blade servers.

Key Features:
  • PCIe Gen 3
  • Support for 12 (option- x48) AMC modules, Fabrics D-G
  • Non-blocking switch fabric
  • Upstream port configurable to any of the 12 AMC slots
  • PCIe hot plug support for each AMC slot
  • Secondary (failover) host possible
  • Clustering support for 6 independent clusters with one configurable non-transparent upstream port; each cluster offers its own transparent upstream port
  • Supports x1 and x4 width ports to any AMC
  • Configuration option for Spread Spectrum Clock (SSC) or 100MHz fixed PCIe clock
  • PCIe clock can be provided as Fabric Clock (FCLKA) to the AMC slots


 XAUI and 10GbE and 40GbE Switch

The NAT-HUB Ethernet Hub Mezzanines for the NAT-MCH provides high performance, low latency and robust Ethernet packet switching service for MTCA systems.

Optical Uplink (optional):
  • 10G or 25G optical transceiver
  • 1G-1000BASEX
  • 10-KR
  • 40G-KR4
  • 100G-KR4 (25G transceiver only)
AMC Interconnect:
  • 1G-1000BASEX
  • 10G-KR
  • 10G-XAUI
  • 40G-KR4
  • Mixture of 40 GbE and 10 GbE infrastructure
  • Combination of 1 up to 4 lanes and 2.5 an 10 Gbaud per lane per AMC slot
Supported Features:
  • Port On/Off
  • 802.1Q VLAN
  • Jumbo Frames
  • Link Status
  • Port-Based VLAN
  • more features will be available soon by firmware upgrade
  • MAC address security port access control (802.1x)


SRIO Gen 2 Switch

The SRIO Gen 2 Mezzanine module provides a non-blocking high performance data switching functionality for up to 12 AMCs.

The non-hierarchical structure of SRIO allows for superior bandwidth data communication between each end point. Additonally, SRIO data integrity and health checks are performed by hardware.

Key Features:
  • SRIO Gen 2
  • Flexible port width: x1 and x4
  • 20 Gb/s bandwith per port (x4)
  • Operating baud rate per data lane 1.25 Gbaud, 2.5 Gbaud or 3.125 Gbaud, 5.0 Gbaud and 6.25 Gbaud
  • Transport layer error management
  • Low latency packet transport
  • Power down modes and routing capabilities per port
  • Decentralised communication model: peer-to-peer


Custom Protocol Switch (based on Xilinx Kintex-7 FPGA)

The NAT-MCH-FPGA combines the above described SRIO Gen 2 switching features and a fully-customizable Xilinx Kintex-7 FPGA. This special FPGA hub module is intended to be used for switching or multiplexing CPRI, OBSAI, as well as other standard protocols (e.g. SRIO, XAUI) or any fully customized serial protocol.

Key Features:
Xilinx Kintex-7 FPGA
  • Customisable high speed serial connection (up to xxGbaud) to AMC1-6
  • Two High speed optical uplinks via SFP+
  • Dual x4 bridging data path between switch and FPGA
  • 1Gb Ethernet connection to MCH base switch
  • Two independent DDR3 memories for user application (up to 4Gb each)
  • On-board low jitter PLL (Texas Instruments CDCE72010)

SRIO Gen 2 Switch

  • x1 SRIO GenII Switch connection to AMC1-6
  • x4 SRIO GenII switch connection to AMC 7-12


NAT-MCH double-width with µRTM COM Express Carrier

The new double-width MCH can be used as a standalone product in all systems requiring the double-width form factor. It is ideally suited for MTCA.4 applications allowing the use of MicroTCA rear transition modules (µRTM).

Combining this MCH with the µRTM COM Express Carrier, allows you to use the unused space behind the MCH. The COM Express carrier can be equipped with any Type 6 Computer on Module (COM) Express module that suits your system requirements.

The benefit of using COM Express modules is the broad range of configurations (processor architecture, performance, memory, etc.), a rich offering by various manufacturers, long-term availability and system configuration flexibility.

Key Features MCH
  • NAT-MCH in double-width, full-size
    • With standard CLK and Hub Module (PCIe Gen 3)
    • RS232 for MCH serial console
    • Optional: 2x SATA Flash Drives (SSD), accessible by COM Express Module
  • Support for µRTM COM Express carrier for standard COM Express Type 6 Module 
    • Direct access to Fat Pipe via PCIe Gen 3 Switch on MCH Hub Module
    • Access to backplane Ethernet via MCH-Switch and on-board GbE Controller
Key Features µRTM COM Express Carrier
  • Access to interfaces provided by MCH (via RTM connector)
    • 2x SATA devices
    • x4 PCIe Gen3 connection between MCH switch and COM Express PEG 0-3 interface
    • Access to MCH Ethernet Switch via on board Ethernet controller, using COM Express PCIe 0 interface
  • Front panel interfaces
    • Gigabit Ethernet (COM Express GbE-0 interface)
    • 2x Display port
    • 4x USB 3.0
  • PCIe Mini card support (including SIM) for wireless applications
  • MicroSD card support
  • IPMI controller


Port On/Off

802.1Q VLAN

Jumbo Frames

Link Status

Port-Based VLAN

Fabric Comparison

PCIe Gen 3
10GbE (XAUI)
SRIO Gen 2
  • Memory mapped access
  • Software compatible to PCI
  • Not only system internal connectivity
  • Data is ready for direct Lan transport
  • Hardware data integrity
  • Memory mapped access
  • Host needed
  • High Software Overhead
  • Not commonly used
Typical Application
  • Processing Blade
  • Next generation Industrial PC
  • Media Gateway Network Convergence
  • Distributed Data processing or Data Acquisition


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or contact us using the contact form. Thank you.

NAT-MCH - Mezzanine Modules

If you are looking for any specific order code in reference to this product please browse our product section (NAT-MCH) or contact us using the contact form. Thank you.