參數(shù)資料
型號(hào)： TC6216M
廠商： Electronic Theatre Controls, Inc.
英文描述： 16 Port 10/100 Unmanaged QoS Ethernet Switch
中文描述： 非網(wǎng)管16端口10/100以太網(wǎng)交換機(jī)的QoS
文件頁(yè)數(shù)： 16/28頁(yè)
文件大?。?/td> 568K
代理商： TC6216M
TC6216M
- 16 -
Ver. 2.1
5/24/01
The broadcast receive bandwidth per port can be reduced to a value between 1.5% to 22% of the port
′
s
maximum bandwidth. When the broadcast bandwidth exceeds the preset value some broadcast packets will be
dropped. The throttling bandwidth can be adjusted using register BroadcastReg, field BndwThrotReg. It is
obtained by multiplying the value in this field with 1.5%. The default value is 4 (6%).
Supplementary, but not depending of the broadcast throttling configuration, all broadcast packets will be
dropped when the total amount of the memory used by broadcast packets exceeds a preset threshold. This
situation will occur only when flow control for broadcast is disabled, otherwise no broadcast packet will be lost.
The flow control for broadcast traffic can be enabled using FcBcstEn pin or EEPROM (BroadcastReg[1]). Even
when broadcast flow control is disabled TC6216M is capable of taking continuos broadcast packets from one
port and deliver them to all the other ports at maximum speed without losing packets.
When TC6216M is configured in BroadcastAll mode all broadcast packets will be sent to all ports. If
BroadcastAll mode is disabled the broadcast packets will be sent only to ports that have the link status on. Link
status is monitored by the PHY polling entity that also reads the port mode autonegotiation result.
Auto Negotiation
12
In Auto-Negotiation Mode (assumed by default when the EEPROM is not present) TC6216M is polling the
PHY
′
s RMII Management Registers using the MDIO line in order to extract the autonegotiated port mode
information, full duplex flow control ability and the link status. The switch detects and follows any changes in
less than 2 seconds.
After reset TC6216M advertises the full duplex flow control capability (writing
′
1
′
to bit 10 from PHY
′
s
Advertisement Register) and restarts the autonegotiation.
If the port mode (speed and duplex) is forced by EEPROM settings then this mode is also advertised before
restarting the autonegotiation. In this case TC6216M will not advertise any other speed or duplex capability
other than what is set by EEPROM. Port mode can be forced using ConfigRegPx bits 5 – 7.
EEPROM Interface
13
TC6216M can be configured using a serial EEPROM device type AT24C02A (2048 bits organized as 256 pages
of 1 byte each). With this device the manufacturer can deliver a pre-configured system to their customers while
the customers can reconfigure the system and retain their preferences.
The TC6216M is able to operate without EEPROM and can make effective use of its features using only the pin
configuration interface. The EEPROM configuration provides additional features and it can override all pin
interface settings offering a jumperless configuration mode. For this reason, equivalent EEPROM settings can be
found for every configuration pin.
A validation bit is provided for each one of the EEPROM Configuration Registers. A dedicated Validation
Register is reserved for this purpose and corresponding bits from this register must be set in order to enable the
desired EEPROM configurations.
The EEPROM configuration information is accessed by the TC6216M after each reset procedure.
14
Programming the EEPROM for configuration
If the
′
Reset
′
pin is hold low, the TC6216M
′
s EEPROM interface will go into high impedance state. This feature
enables easy programming of the EEPROM during installation or configuration.
The EEPROM can be programmed using an external parallel port. A dedicated signal from this port can be used
to hold the RESET pin low. Once the TC6216M interface pins have got to the high impedance state the
EEPROM can be programmed by the parallel port through the SDA and SCL pins.
To enable the AT24C02A device to be accessed by the TC6216M, its page address input pins must be hardwired
to
′
0
′
.
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