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参数资料
| 型号： | IP178C-DS-R10 |
| 厂商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 8 Port 10/100 Ethernet Integrated Switch |
| 中文描述： | 8端口10/100以太网集成开关 |
| 文件页数： | 42/93页 |
| 文件大小： | 538K |
| 代理商： | IP178C-DS-R10 |
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IP178C/IP178C LF/IP178CH/IP178CH LF
Datasheet
2.9
CoS
IP178C/IP178CH
supports two type of CoS. One is port base priority function and the other is frame
base priority function.
IP178C/IP178CH
supports two levels of priority queues. A high priority packet will
be queued to the high priority queue to share more bandwidth. The ratio of bandwidth of high priority and
low priority queue is defined in MII register 30.1[15] or EEPROM 3[7].
2.9.1
Port base priority
The packets received from high priority port will be handled as high priority frames if the port base priority
is enabled. It is enabled by programming the corresponding bit in MII register 31.0[9]~31.8[9] or
EEPROM register 65[1] ~81[1]. Each port of
IP178C/IP178CH
can be configured as a high priority port
individually.
2.9.2
Frame base priority
VLAN tag and TCP/IP TOS
IP178C/IP178CH
examines the specific bits of VLAN tag and TCP/IP TOS for priority frames if the frame
base priority is enabled. The packets will be handled as high priority frames if the tag value meets the
high priority requirement, that is, VLAN tag bigger than 3 or TCP/IP TOS field not equal to 3’b000. It is
enabled by programming the corresponding bit in MII register 31.0[10]~31.8[10] or EEPROM register
65[2]~81[2]. The frame base priority function of each port can be enabled individually.
IP178C/IP178CH
supports an easy way to enable a sub set of CoS function without programming
EEPROM or MII registers. Port 6 and port 7 can be set as high priority ports if pin 100 P6_7_HIGH is
pulled high. Frame base priority function of all ports is enabled if pin 99 COS_EN is pulled high. The
setting in register takes precedence of the setting on pins.
byte
TYPE = 8100
VLAN field
TCI (tag control information)
12~13
14~15
TCI definition:
Bit[15:13]: User Priority 7~0
Bit 12: Canonical Format Indicator (CFI)
Bit[11~0]: VLAN ID.
IP178C uses bit[15:13] to define priority.
byte
TYPE = 0800
TOS field
IP HEADER
12~13
14~15
IP header definition:
Byte 14
Bit[7:0]: IP protocol version number & header length.
Byte 15: Service type
Bit[7~5]: IP Priority (Precedence ) from 7~0
Bit 4: No Delay (D)
Bit 3: High Throughput
Bit 2: High Reliability (R)
Bit[1:0]: Reserved
IP178C uses bit[4:2] to define priority.
Copyright
2004, IC Plus Corp.
42/93
June 21, 2007
IP178Cx-DS-R12
相关PDF资料 |
PDF描述 |
|---|---|
| IP178C-DS-R01 | 8 Port 10/100 Ethernet Integrated Switch |
| IP178C-DS-R02 | 8 Port 10/100 Ethernet Integrated Switch |
| IP178C | 8 Port 10/100 Ethernet Integrated Switch |
| IP178CH | 8 Port 10/100 Ethernet Integrated Switch |
| IP178CHLF | 8 Port 10/100 Ethernet Integrated Switch |
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|---|---|
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