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参数资料
| 型号： | IP178CLF |
| 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： | 40/91页 |
| 文件大小： | 1244K |
| 代理商： | IP178CLF |
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IP178C
Preliminary Data Sheet
2.9
CoS
IP178C supports two type of CoS. One is port base priority function and the other is frame base priority
function. IP178C 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 can be configured as a high priority port individually.
2.9.2
Frame base priority
VLAN tag and TCP/IP TOS
IP178C 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 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.
40/91
October 27, 2005
IP178C-DS-R09
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