RTL8305S
RTL8305S
5-PORT 10/100 MBPS SINGLE CHIP
SWITCH CONTROLLER
1. Features ..................................................................................................................................................................................... 2
2. General Description .................................................................................................................................................................. 2
3. Block Diagram .......................................................................................................................................................................... 3
4. Pin Assignments........................................................................................................................................................................ 4
5. Pin Descriptions ........................................................................................................................................................................ 6
5.1 Media Connection Pins ....................................................................................................................................................... 6
5.2 Mode Pins ........................................................................................................................................................................... 6
5.3 Port4 Related Pins............................................................................................................................................................... 7
5.4 LED Pins............................................................................................................................................................................. 8
5.5 Power Pins .......................................................................................................................................................................... 8
5.6 Miscellaneous Pins.............................................................................................................................................................. 8
5.7 Reserved Pins...................................................................................................................................................................... 8
6. Functional Description.............................................................................................................................................................. 9
6.1 Introduction......................................................................................................................................................................... 9
6.2 Switch Core Functional Overview ...................................................................................................................................... 9
6.2.1 Address Search, Learning and Aging........................................................................................................................... 9
6.2.2 Buffer Management.................................................................................................................................................... 10
6.2.3 Data Reception ........................................................................................................................................................... 10
6.2.4 Data Forwarding......................................................................................................................................................... 10
6.2.5 Flow Control ...............................................................................................................................................................11
6.2.6 Back-off Algorithm .....................................................................................................................................................11
6.2.7 Inter-Frame Gap ..........................................................................................................................................................11
6.2.8 Illegal Frame ...............................................................................................................................................................11
6.2.9 Broadcast Storm Control.............................................................................................................................................11
6.3 Physical Layer Functional Overview .................................................................................................................................11
6.3.1 Auto-negotiation .........................................................................................................................................................11
6.3.2 10Base-T Transmit Function.......................................................................................................................................11
6.3.3 10Base-T Receive Function ........................................................................................................................................11
6.3.4 Link Monitor ...............................................................................................................................................................11
6.3.5 100Base-TX Transmit Function ................................................................................................................................. 12
6.3.6 100Base-TX Receive Function .................................................................................................................................. 12
6.3.7 Power Saving Mode ................................................................................................................................................... 12
6.4 LED................................................................................................................................................................................... 12
6.5 MII Port............................................................................................................................................................................. 13
6.5.1 General Description ................................................................................................................................................... 13
6.5.2 MII/SNI PHY Mode................................................................................................................................................... 16
6.5.3 MII MAC Mode ......................................................................................................................................................... 16
7. Electrical Characteristics......................................................................................................................................................... 18
7.1 Absolute Maximum Ratings ............................................................................................................................................. 18
7.2 Operating Range ............................................................................................................................................................... 18
7.3 DC Characteristics (0擄C<Ta<60擄C, 3.15V<Vcc<3.45V) ................................................................................................. 18
7.4 AC Characteristics (0擄C<Ta<60擄C, 3.15V<Vcc<3.45V) ................................................................................................. 19
7.5 Digital Timing Characteristics .......................................................................................................................................... 20
7.6 Thermal Data..................................................................................................................................................................... 20
8. Application Information.......................................................................................................................................................... 21
9. System Application Diagram .................................................................................................................................................. 22
10. Mechanical Dimensions ........................................................................................................................................................ 23
2002/02/19
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