參數(shù)資料
型號: PIC16LF1509-I/SS
廠商: Microchip Technology
文件頁數(shù): 53/123頁
文件大小: 0K
描述: IC MCU 8BIT 14KB FLASH 20-SSOP
標(biāo)準(zhǔn)包裝: 67
系列: PIC® XLP™ 16F
核心處理器: PIC
芯體尺寸: 8-位
速度: 20MHz
連通性: I²C,LIN,SPI,UART/USART
外圍設(shè)備: 欠壓檢測/復(fù)位,POR,PWM,WDT
輸入/輸出數(shù): 17
程序存儲器容量: 14KB(8K x 14)
程序存儲器類型: 閃存
RAM 容量: 512 x 8
電壓 - 電源 (Vcc/Vdd): 1.8 V ~ 3.6 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 12x10b,D/A 1x5b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 20-SSOP(0.209",5.30mm 寬)
包裝: 管件
Micrel, Inc.
KSZ8873MLLJ
September 2011
35
M9999-091911-1.8
Ingress to Port 3 (Host -> KSZ8873MLLJ)
Bit [1,0]
Destination Port
0,0
Normal (Address Look up)
0,1
Port 1
1,0
Port 2
1,1
Port 1 and 2
Bit [3,2]
Frame Priority
0,0
Priority 0
0,1
Priority 1
1,0
Priority 2
1,1
Priority 3
Egress from Port 3 (KSZ8873MLLJ->Host)
Bit [0]
Source Port
0
Port 1
1
Port 2
Figure 8. Tail Tag Rules
IGMP Support
For Internet Group Management Protocol (IGMP) support in layer 2, the KSZ8873MLLJ provides two components:
IGMP Snooping
The KSZ8873MLLJ traps IGMP packets and forwards them only to the processor (port 3). The IGMP packets are
identified as IP packets (either Ethernet IP packets, or IEEE 802.3 SNAP IP packets) with IP version = 0x4 and protocol
version number = 0x2.
IGMP Send Back to the Subscribed Port
Once the host responds the received IGMP packet, the host should knows the original IGMP ingress port and send back
the IGMP packet to this port only, otherwise this IGMP packet will be broadcasted to all port to downgrade the
performance.
Enable the tail tag mode, the host will know the IGMP packet received port from tail tag bits [0] and can send back the
response IGMP packet to this subscribed port by setting the bits [1,0] in the tail tag. Enable “Tail tag mode” by setting
Register 3 bit 6. The tail tag will be removed automatically when the IGMP packet is sent out from the subscribed port.
Port Mirroring Support
KSZ8873MLLJ supports “Port Mirroring” comprehensively as:
“receive only” mirror on a port
All the packets received on the port are mirrored on the sniffer port. For example, port 1 is programmed to be
“receive sniff” and port 3 is programmed to be the “sniffer port”. A packet received on port 1 is destined to port 2
after the internal lookup. The KSZ8873MLLJ forwards the packet to both port 2 and port 3. The KSZ8873MLLJ
can optionally even forward “bad” received packets to the “sniffer port”.
“transmit only” mirror on a port
All the packets transmitted on the port are mirrored on the sniffer port. For example, port 1 is programmed to be
“transmit sniff” and port 3 is programmed to be the “sniffer port”. A packet received on port 2 is destined to port 1
after the internal lookup. The KSZ8873MLLJ forwards the packet to both port 1 and port 3.
“receive and transmit” mirror on two ports
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