SMART Embedded Computing RTM-ATCA-F140 Series, Инструкция по установке и использованию

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66 RTM-ATCA-F140 Series Installation and Use (6806800M97M)
Functional Description
Functional Description
4.6.6.1 QSFP+ I
2
C Bus
The QSFP+ I
2
C bus signals (I2C_SDA and I2C_SCL) from each SFP+ site are individually
connected to the BCM84740 which includes a mechanism to allow access to the port
through the PHY management channel.
4.6.6.2 QSFP+ Status Signals
The QSFP+ status signals, MODPRS#, and INT#, are individually connected to the
BCM84740 which monitors them. The signals are also connected to the RTM FPGA to
allow fast detection of a loss of signal condition. Refer to
GPS Connectors on page 67
for
further details.
4.6.6.3 QSFP+ Control Signals
The QSFP+ LPMODE signal is connected to the BCM84740. This allows software control
of the power mode, or hardware control through deassertion of the TXONOFF signal.
4.6.7 PHY Management Interfaces
The BCM84740 provides a single MDC/MDIO management port to access all four channels
and allows bits 0 and 1 of the PHY address for each channel to be individually programmed,
with bits 2 - 4 being common. The next table shows the address allocation and
management port definition for each channel.
18 RX1- 21 RX2-
19 GND 20 GND
Table 4-9 QSFP+ Connector Pin Assignment (continued)
Pin Signal Pin Signal
Table 4-10 BCM84740 PHY Addressing
PHY
Addr
High
Bits
Channel Source
PHY
Addr
Low
Bits
PHY
Addr
Switch
Port QSFP+
Port Management
Channel
b000 0 Fabric b00 0
FIX_P14
Lane 0 Fabric
QSFP+ FIX_XG_MDC2/
MDIO2