"120Gb/s CXP-120G规范及描述详解"

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The CXP-120G specification is a high-speed interface standard that defines the requirements for 120 Gb/s communication using 12x Small Form-factor Pluggable (CXP) connectors. This standard is a supplement to the InfiniBandTM Architecture Specification Volume 2 Release 1.2.1 Annex A6, which outlines the specifications for 120 Gb/s interfaces. The CXP-120G specification defines the physical and electrical characteristics of the interface, including cable requirements, active cable specifications, and connector specifications. The standard ensures interoperability and compatibility between devices that use the CXP-120G interface, allowing for seamless communication at high speeds. One of the key features of the CXP-120G specification is its small form-factor design, which allows for high-density connectivity in data centers and other networking environments. The 12x CXP connectors provide a compact and efficient solution for transmitting data at 120 Gb/s speeds, making them ideal for high-performance computing applications. In addition to the physical and electrical specifications, the CXP-120G standard also includes requirements for signal integrity, power consumption, and thermal management. These guidelines ensure reliable and stable performance of devices that implement the interface, even under high data transfer loads. Overall, the CXP-120G specification is a comprehensive and detailed standard that addresses the needs of high-speed communication in modern networking environments. By defining the requirements for 120 Gb/s communication using 12x CXP connectors, this standard enables the development of advanced networking solutions that can meet the demands of today's data-intensive applications.

InfiniBand

Architecture - Annex A6 Electrical Specification September 2009

OLUME 2 - PHYSICAL SPECIFICATIONS FINAL RELEASE

InfiniBand

Trade Association Page 16 CXP Specification

Reset_L operation: When the Int_L/Reset_L signal is pulled “Low” by the

host for longer than the minimum reset pulse length (t

reset_L,PW-min

), it ini-

tiates a complete module reset, returning all user module settings to their

default state. There is no maximum reset pulse length. Module Reset As

sert Time (t_init) starts on the rising edge after the low level on the

Reset_L signal is released. During the execution of a reset (t_init) the

host shall disregard all status bits until the module indicates a completion

of the reset interrupt. The module indicates this by posting an Int_L signal

with the Data_Not_Ready bit (Memory Map, Byte 2, bit 0) negated (set to

0). Note that on power up (including hot insertion) the module should post

this completion of reset interrupt without requiring a reset from the host.

2.3.3 PRSNT_L

PRSNT_L is used to indicate when the module is plugged into the host

receptacle.

PRSNT_L is pulled up to Vcc3.3 on the host board through

>50 kOhm. It is pulled down to signal common through 5.2 kOhm in mod-

ules requiring 12V power, and tied directly down to signal common (no re-

sistor) in modules requiring 3.3V power only. The PRSNT_L signal is

asserted “Low” when inserted and deasserted “High” when the module is

physically absent from the host connector.

2.4 HIGH-SPEED ELECTRICAL CONTACT/SIGNAL DEFINITIONS

2.4.1 RECEIVE SIGNALS: RX[0-11][P/N]

Rx[0-11][p/n] are CXP module receiver data outputs. They are AC-cou-

pled differential lines that should be terminated with 100 Ohm differential

at the Host ASIC or SerDes. The AC coupling is inside the CXP module

and not required on the Host board.

Output squelch for loss of input signal (Rx Squelch), is an optional func-

tion. Where implemented it shall function as follows. In the event of the op-

tical or electrical signal on any physical lane becoming equal to or less

than the level required to assert loss of signals (Rx LOS), then the receiver

data output for that lane shall be squelched or disabled. In the squelched

or disabled state, output impedance levels are maintained while the differ

ential voltage swing shall be less than 50 mVpp, This voltage swing limit

provides margin vs. the value specified for V

RSD

, Signal Threshold for re-

ceiver signal detection (85 mVpp in Rel. 1.2.1) in InfiniBand Architecture

Specification, Volume 2,

Chapter 6: High Speed Electrical Signaling - 2.5,

5.0, & 10.0 Gb/s

In normal operation, where Rx Squelch is implemented, the default case

has Rx Squelch active. Rx Squelch can be deactivated using Rx Squelch

Disable through the 2-wire serial interface. Rx Squelch Disable is an op

tional function.

InfiniBand

Architecture - Annex A6 Electrical Specification September 2009

OLUME 2 - PHYSICAL SPECIFICATIONS FINAL RELEASE

InfiniBand

Trade Association Page 17 CXP Specification

2.4.2 TRANSMIT SIGNALS: TX[0-11][P/N]

Tx[0-11][p/n] are CXP module transmitter data inputs. They are AC-cou-

pled differential lines with 100 Ohm differential terminations inside the

CXP module. The AC coupling is inside the CXP module and not required

on the Host board.

Output squelch (Tx Squelch), for loss of input signal, (Tx LOS), is an op-

tional function. Where implemented it shall function as follows. In the

event of the differential, peak-to-peak electrical signal on any lane be

comes equal to or less than 50 mVpp, then the transmitter optical output

for that lane shall be squelched and the associated Tx LOS flag set. For

an optical transceiver with separable optical connector, the optical modu

lation amplitude (OMA) when squelched shall be less than or equal to -26

dBm.

In normal operation, where Tx Squelch is implemented, the default case

has Tx Squelch active. Tx Squelch can be deactivated using Tx Squelch

Disable through the 2-wire serial interface. Tx Squelch Disable is an op

tional function.

2.5 POWER REQUIREMENTS

Power for the module is supplied through 4 contacts: Vcc3.3-Rx, Vcc12-

Rx, Vcc3.3-Tx and Vcc12-Tx. Power is applied concurrently to them.

Since different classes of modules exist with pre-defined maximum power

consumption limits, it is necessary to avoid exceeding the system power

supply limits and cooling capacity when a module is inserted into a system

designed to only accommodate lower power modules. It is recommended

that the host, through the management interface, identify the power con

sumption class of the module before allowing the module to go into high

power mode.

A host board together with the CXP module(s) forms an integrated power

system. The host supplies stable power to the module. The module limits

electrical noise coupled back into the host system and limits inrush

charge/current during hot plug insertion.

All specifications shall be met at the maximum power supply current. No

power sequencing of the power supply is required of the host system

since the module sequences the contacts in the order of ground, supply

and signals during insertion.

2.5.1 HOST POWER SUPPLY FILTERING

The host board should use the power supply filtering network shown in

Figure 3 on page 18, or an equivalent. Any voltage drop across a filter net-

work on the host is counted against the host DC set point accuracy spec-

InfiniBand

Architecture - Annex A6 Electrical Specification September 2009

OLUME 2 - PHYSICAL SPECIFICATIONS FINAL RELEASE

InfiniBand

Trade Association Page 19 CXP Specification

2.5.2 HOST POWER SUPPLY SPECIFICATIONS

The specification for the power supply is shown in Table 3 on page 19.

2.5.3 POWER BUDGET CLASSES

Power levels associated with classifications of modules are shown in

Table 4 on page 19. In general, the higher power classification levels are

associated with higher data rates and longer reach, for a particularly tech-

nology family.

Power Class 0 supports a management-interface-only power level, for de-

vices such as passive copper cables which require little or no signal

power.

Power Classes 1 through 5 describe devices with between 0.25W and 6.0

Watts, with roughly a factor of 1.5 differentiating each power class.

Power Class 6 (higher than 6 Watts), is intended as a special high-power

class, allowing higher-power devices and cables to operate with more

than 6 Watts only after negotiation with a host that can support the cooling

and power-delivery infrastructure to support such devices. As described

in the Memory map, at Byte 44 in the Tx lower page and Byte 148 in Upper

Page 00h, a device may not draw more than 6 Watts unless actively al

lowed by a host system. The actual amount of power used by such a high-

Table 3 Power Supply Specification

Parameter Min Nominal Max Unit Condition

Vcc12_host 12 Measured at Vcc12-Tx and Vcc12-Rx

Vcc12 set point accuracy -5 +5 % Measured at Vcc12-Tx and Vcc12-Rx.

Vcc12 Power supply noise including ripple 50 mVpp 1kHz to frequency of operation

Vcc3.3_host 3.3 V Measured at Vcc3.3-Tx and Vcc3.3-Rx

Vcc3.3 set point accuracy -5 +5 % Measured at Vcc3.3-Tx and Vcc3.3-Rx.

Note

Vcc3.3 Power supply noise including ripple 50 mVpp 1kHz to frequency of operation

Module Maximum Current Inrush 1.25 A On any contact.

Module Current Ramp Rate 100 mA/uS

1. 5%-accurate power needed for VCSEL laser drivers

Table 4 Power Budget Classification

Power Class Max Power (W) Power Class Max Power (W)

0 0.25 or less 1 1.0 or less

2 1.5 or less 3 2.5 or less

4 4.0 or less 5 6.0 or less

6 Higher than 6 Watts 7 Reserved

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