Phy Management Interfaces; 40Gbps Fabric Ports; Fabric Connectivity; Table 4-8 Bcm84754 Phy Addressing - SMART Embedded Computing RTM-ATCA-F140 Series Installation & Use Manual

4.5.7

PHY Management Interfaces

The BCM84754 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.
Table 4-8
PHY
Addr
Channel Source
High
Bits
0
b001
1
2
3
4.6

40Gbps Fabric Ports

The RTM-ATCA-F140 provides a 40Gbps capable QSFP+ module site connected to the
fabric switch on the front blade.
4.6.1

Fabric Connectivity

One 40GbE port from the front blade fabric switch connects to a BCM84740 quad XLAUI-
to-SFI PHY which then connects to a single QSFP+ connector using an SFI interface as
shown in
Figure
supports a single 40GbE logical connection. When the fabric switch is configured for 4x XFI
mode, the QSFP+ slot supports four 10GbE connections. This mode assumes the use of a
fiber breakout cable on the QSFP+ module (MPO to 4x LC cable). The RTM-ATCA-F140
RTM-ATCA-F140 Series Installation and Use (6806800M97M)
BCM84754 PHY Addressing
PHY
Addr
Low
Bits
Fabric b00
Fabric b01
Fabric b10
Fabric b11
4-5. When the fabric switch is configured for XLAUI mode, the QSFP+ slot
Functional Description
PHY Switch
SFP+ Port
Addr Port
FIX_P15 Fabric SFP+
4
Lane 0 4
FIX_P15 Fabric SFP+
5
Lane 1 3
FIX_P15 Fabric SFP+
6
Lane 2 2
FIX_P15 Fabric SFP+
7
Lane 3 1
Management
Channel
FIX_XG_MDC2/
MDIO2
63