zl50411 Zarlink Semiconductor, zl50411 Datasheet - Page 78

• Manufacturer Part Number: zl50411
• Description: Managed 9-port Fast Ethernet Switch With Private Vlan
• Manufacturer: Zarlink Semiconductor

Port 8: (CPU Port)
Port 9: (MMAC Port)
Bits [1:0]:
Bit [2]:
Bits [4:3]:
Bit [5]:
Bit [6]:
Bit [7]:
Bits [1:0]:
Bit [2]:
Bits [4:3]:
Enable PHY Mode
00: MAC Mode (Default)
11: PHY Mode (Reverse MII)
In PHY mode, M9_RXCLK pin becomes an output and M9_MTXCLK must be tied
to M9_RXCLK externally.
Internal loopback.
0: Disable (Default)
1: Enable
In this mode, the packet is looped back in the MAC layer before going out of the
chip. You must force linkup at full duplex as well.
External loopback is another level of system diagnostic which involves the PHY
device to loopback the packet.
Interface mode:
Reserved
Enable special write to 2 registers in a single write operation.
0: Disable (Default)
1: Enable
Should be enabled only in serial mode and disabled in 8/16-bit mode.
Enable insertion of 2-byte CPU information in CPU frame packet in Serial + MII
mode
00: No information is inserted
01: Insert 2-byte of CPU information
10: Reserved
11: Insert 6-byte of padding + 2-byte of CPU information (Default)
In port-based VLAN mode, the CPU MII interface must be in “No information is
inserted” mode (ECR4P8[4:3]='00'). In tagged-based VLAN mode, the CPU MII
interface supports all three modes (0,2,8 bytes insertion).
Frame loopback.
0: Disable frame from sending back to its source port. (Default)
1: Allow frame to send back to its source port
In a regular ethernet switch, a packet should never be receive and forwarded to
the same port. Setting the bit allows it to happen.
This is not the same as an ingress MAC loopback. The destination MAC address
has to be stored (learned) in the MCT and associated with the originating source
port. The frame loopback will only work for unicast packets.
Reserved
Soft reset.
0: Normal operation (Default)
1: Reset. Not self clearing.
11 - MII mode (Default)
Zarlink Semiconductor Inc.
ZL50411
78
Data Sheet