zl50400 Zarlink Semiconductor, zl50400 Datasheet - Page 65

• Manufacturer Part Number: zl50400
• Description: Lightly Managed/unmanaged 9-port 10/100 M Ethernet Switch
• Manufacturer: Zarlink Semiconductor

12.3.1.3
I²C Address: 014+n; CPU Address:0080+2n (n = port number)
Accessed by CPU and I²C (R/W)
Bit [0]:
Bit [1]:
Bit [2]:
Bit [3]:
Bits [6:4]
Bits [7:6]
ECR3Pn: Port n Control Register
Security Enable. The ZL50400 checks the incoming data for one of the following
conditions:
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If any one of the conditions is met, the packet is forwarded based on these setting.
It also checks for one of the following additional conditions:
•
•
•
•
If any one of the conditions is met, the packet will be handled according to:
Enable receiving short frame < 64B
0: Disable (Default)
1: Allow receiving short frame with correct CRC.
Enable receiving long frame > 1522
0: Disable (Default)
1: Allow receiving long frame that are <= BUF_LIMIT value
Enable pad frame to 64B when transmitted
0: Allow padding to 64B (Default)
1: Disable
Enable compress preamble
0: Send standard preamble (Default)
1: Only one byte preamble+SFD
Number of bytes removed from the Inter-Frame Gap (IFG). (Default 0x0)
0X – Discard violating packets
1X – Forward violating packets to CPU for inspection
00 – Disable port security, forward packets as usual. (Default)
01 – Discard violating packets
10 – Forward violating packets as usual and also to the CPU for inspection
11 – Forward violating packets to the CPU for inspection
If the source MAC address of the incoming packet is in the MAC table and is
defined as secure address but the ingress port is not the same as the port
associated with the MAC address in the MAC table.
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If the port is set as learning disable and the source MAC address of the
incoming packet is not defined in the MAC address table or the MAC
address is not associated to the ingress port.
If the port is configured to filter untagged frames and an untagged frame
arrives, or
If the port is configured to filter tagged frames and a tagged frame arrives, or
If the packet has the source mac address on the source mac address filter
list, or
If the packet has the destination mac address on the destination mac
address filter list
A MAC address is defined as secure when its entry at MAC table has
static status and bit 0 is set to 1. MAC address bit 0 (the first bit
transmitted) indicates whether the address is unicast or multicast. As
source addresses are always unicast bit 0 is not used (always 0).
ZL50400 uses this bit to define secure MAC addresses.
Zarlink Semiconductor Inc.
ZL50400
65
Data Sheet