
RTL8305SB 
2002/04/09 
18
Rev.1.0
LED_ACT[2]/ 
EnForward 
111 
I/O 
Output after reset = used for LED 
Input upon reset = Enable to forward 802.1D specified reserved 
group MAC addresses frame
. 
1: Forward reserved control frames, which DID=01-80-C2-00-00-03 to 
01-80-C2-00-00-0F packets. 
0: Filter reserved control packets, which DID=01-80-C2-00-00-03 to 
01-80-C2-00-00-0F.  
Output after reset = used for LED 
Input upon reset = Broadcast Input Drop. 
1: Use Broadcast Input drop mechanism.  
0: Use Broadcast Output drop mechanism. 
Output after reset = used for LED 
Input upon reset = Maximum Frame Length 1536 Bytes 
1: 1536 Bytes  
0: 1552 Bytes  
Output after reset = used for LED 
Input upon reset = Back pressure Mode. 
48pass1:
1: 48 pass 1: at most 48 consecutively collision to avoid repeater 
partition when buffer is full. 
0: Continuously collide to avoid packet loss when buffer is full.  
EnDefer:  
1: Enable Carrier Sense Deferring function for half duplex back pressure. 
0: Disable Carrier Sense Deferring function for half duplex back pressure. 
Output after reset = used for LED: 
Input upon reset = Disable ARP broadcast to all VLAN. 
1: Disable to broadcast the ARP broadcast packet to all VLANs.  
0: Enable to broadcast the ARP broadcast packet to all VLANs. 
ARP broadcast frame: DID is all F. 
Output after reset = used for LED: 
Input upon reset = Disable Leaky VLAN. 
1: Disable to forward unicast frames to other VLAN.  
0: Enable to forward unicast frames to other VLAN.  
Broadcast and multicast frames adhere to the VLAN configuration. 
1 
LED_SPD[2]/ 
BCInDrop 
113 
I/O 
1 
LED_DUP[3]/ 
Max1536 
115 
I/O 
1 
LED_DUP[4]/ 
48pass1 
LED_SPD[3]/ 
EnDefer 
LED_ACT[3]/ 
RESERVED2 
118 
117 
116 
I/O 
111 
LED_ACT[4] 
/DisARP 
119 
I/O 
1 
LED_SPD[4]/ 
DisLeaky 
120 
I/O 
1