ZL50405GDC ZARLINK [Zarlink Semiconductor Inc], ZL50405GDC Datasheet - Page 49

• Manufacturer Part Number: ZL50405GDC
• Description: Managed5-Port 10/100 M Ethernet Switch
• Manufacturer: ZARLINK [Zarlink Semiconductor Inc]

address pair will be copied to the mirrored port. In reverse direction (source and destination match pre programmed
destination and source), the flow can also be enabled and the frame will be copied to the mirrored port.
In port based mirroring, traffic from any RMAC port can be mirrored to any RMAC port. The traffic from the source
port can be either ingress or egress traffic. Up to two ports can be setup as mirrored ports. As a result, the traffic
(both ingress and egress) of a specific port can be monitored by setting up both mirrored ports. Once a port is setup
as mirrored port, it cannot be used for regular traffic.
The mirrored port can be any port in the ZL50405.
9.2
To perform remote loop back test, port mirroring can be used to bounce back the packet to the source port to check
the data path.
The CPU needs to setup the remote device through the command channel to enable port mirroring in the remote
device. A CPU packet is send to the port in test in Device A. The packet will be forwarded to the test port, external
cable, the destination port in Device B, and loop back to itself, back to the cable and go back to Device A and the
CPU. This way, the whole channel can be tested.
10.0
10.1
10.1.1
SCLK is the primary clock for the ZL50405 device. The speed requirement is based on the system configuration.
Below is a table for a few configuration.
10.1.2
M_CLK is a 50 MHz clock used for the RMAC ports (ports 0-3) and CPU port (port 8).
If none of the RMAC ports are configured in RMII mode or Reverse MII mode, a different clock frequency can be
applied to M_CLK, as long as it's less than 50 MHz. In this case, register USD must be set to provide an internal
1usec timing.
1-5 ports 10/100M
Using port mirroring for loop back
Clock Requirements
Clocks
System Clock (SCLK) speed requirement
RMAC Reference Clock (M_CLK) speed requirement
DEVICE A
CPU
Configuration
Table 12 - SCLK Speed Requirements
Figure 12 - Remote Loopback Test
Zarlink Semiconductor Inc.
ZL50405
49
25 Mhz
Minimum SCLK speed
DEVICE B
required
Data Sheet