
RTL8305SB 
2002/04/09 
12
Rev.1.0
P4SPDSTA/ 
P4SPD100 
47 
I 
Port4 Speed Status: 
Port4 initial configuration pin for Speed upon reset 
for PHY of UTP mode only and Speed Status for MAC of other mode in 
real time after reset. 
1: 100Mbps 
0: 10Mbps 
When P4MODE[1:0]=11 (UTP/MAC mode MII), this pin provides the 
initial configuration of speed for the PHY part upon reset (UTP) then 
determines speed status of MAC mode MII in real time after reset. The 
speed status of the PHY part (UTP) is provided by the internal PHY in 
real time after reset. 
When P4MODE[1:0]=10 (100Base-FX mode), speed is dedicated to 
100M. This pin does nothing and should be left floating. 
When P4MODE[1:0]=01 (PHY mode MII), this pin determines the 
duplex status of Port4 in real time after reset. 
When P4MODE[1:0]=00 (PHY mode SNI), speed is dedicated to 
10MHz clock rate. This pin should be pulled down.  
For the application listed below, this pin should be left floating: 
 For P4MODE[1:0]=10 (100Base-FX mode). 
For the application listed below, this pin should be pulled down: 
 For PHY mode SNI, speed is dedicated to 10MHz clock rate. 
8305SB = P4SPDSTA/P4SPD100, 8305S = P4SPDSTA#. 
In order to provide 100M for the default value for PHY, this pin is 
changed as high active. 
Port4 Flow Control: 
Port4 initial configuration pin for Flow Control 
upon reset for PHY of UTP and FX mode and Flow Control Status for 
MAC of other mode in real time after reset. 
1=Enable Flow Control ability. 
0=Disable Flow Control ability. 
When P4MODE[1:0]=11 (UTP/MAC mode MII), this pin provides the 
initial configuration of flow control for the PHY part upon reset (UTP) 
then determines the flow control status of MAC mode MII in real time 
after reset. The flow control status of PHY part (UTP) is provided by the 
internal PHY in real time after reset. 
When P4MODE[1:0]=10 (100Base-FX mode), this pin provides the 
initial configuration of flow control for the PHY part upon reset (FX).  
When P4MODE[1:0]=01 (PHY mode MII), this pin determines the 
duplex status of Port4 in real time after reset. 
When P4MODE[1:0]=00 (PHY mode SNI), flow control should be 
disabled. This pin should be pulled down. 
8305SB = P4FLCTRL/P4EnFC, 8305S = P4FLCTRL#. 
In order to enable flow control ability for the PHY, this pin is changed as 
high active. 
1 
P4FLCTRL/ 
P4EnFC 
46 
I 
1 
Cont…