zl50411 Zarlink Semiconductor, zl50411 Datasheet - Page 27

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

2.2.4
The table below provides an overview of the PHY addresses required for each port in order for the MDIO
auto-negotiation to work between the ZL50411 MAC and the PHY device. If a different PHY address is used, then
the port must be manually brought up and the PHY will need to be polled for link status via the MIIC/D registers.
2.3
The CPU can send a control frame to access or configure the internal network management database. The
Management Module decodes the control frame and executes the functions requested by the CPU.
This module is only active in managed mode. In unmanaged mode, no control frame is accepted by the device.
2.4
The main function of the frame engine is to forward a frame to its proper destination port or ports. When a frame
arrives, the frame engine parses the frame header (64 bytes) and formulates a switching request, sent to the
search engine, to resolve the destination port. The arriving frame is moved to the internal memory. After receiving a
switch response from the search engine, the frame engine performs transmission scheduling based on the frame’s
priority. The frame engine forwards the frame to the MAC module when the frame is ready to be sent.
2.5
The Search Engine resolves the frame’s destination port or ports according to the destination MAC address (L2), or
IP multicast address (L3) by searching the database. It also performs unicast MAC learning, trunking functions, and
priority assignment.
2.6
The ZL50411 provides the ability to monitor a link and detect a simple link failure. The Link Heart Beat (LHB) packet
generation module allows simultaneous tracking of all the RMAC ports.
Periodically, a LHB message will be sent for each link when inactivity is detected with in a programmable time
period, If a reply is not received in a specified amount of time, the failover detection module will identify a
point-to-point failure for that link. The failover detection module will then interrupt the CPU.
The LHB packet response module can also reply to LHB messages initiated by other ZL50411 devices in the
system, or by non-ZL50411 devices which use a conventional and recognizable LHB message format.
2.7
The ZL50411 supports a state machine monitoring block which can trigger a reset or interrupt if any state machine
is determined to be stuck in a non-idle state for more than 5 seconds. This feature is enabled via a bootstrap pin
(TSTOUT12). It also requires some register configuration via the CPU interface.
Management Module
Frame Engine
Search Engine
Heartbeat Packet Generation and Response
Timeout Reset Monitor
PHY Addresses
RMAC Port 0
RMAC Port 1
...
RMAC Port 7
CMAC Port 8
MMAC Port 9
MAC Port
Table 5 - PHY Addresses
Zarlink Semiconductor Inc.
ZL50411
27
PHY Address
0x08
0x09
...
0x0F
NA
0x10
Data Sheet