RTL8305SC
Datasheet
5-port 10/100Mbps Single-Chip Dual MII Switch Controller
20
Track ID: JATR-1076-21 Rev. 1.2
Pin Name
Pin No. Type
Drive (mA) Description
IBREF
127
A
Control transmit output waveform Vpp
This pin should be grounded through a 1.96KΩ resistor.
VCTRL
123
O
4
Voltage control to external regulator
This signal controls a power PNP transistor to generate the 1.8V
power supply.
ITEST1
36
Reserved pin for internal use. Should be left floating
ITEST2
37
Reserved pin for internal use. Should be left floating
ITEST3
38
Reserved pin for internal use. Should be left floating
ITEST4
41
Reserved pin for internal use. Should be left floating
ITEST5
65
Reserved pin for internal use. Should be left floating
ITEST6
72
Reserved pin for internal use. Should be left floating
DTEST2
124
Reserved pin for internal use. Should be left floating
DTEST1
125
Reserved pin for internal use. Should be left floating
5.6. Port LED Pins
Each port has four LED indicator pins. Each pin may have different indicator meanings as set by pins
LEDMODE[1:0].
All LED statuses are represented as active-low or high depending on input strapping, except Bi-color
Link/Act in Bi-color LED mode, whose polarity depends on Spd status.
Those pins that are dual function pins are output for LED or input for strapping. Below are LED
descriptions only.
Table 7. Port LED Pins
Pin Name
Pin No. Type
Drive (mA) Description
LED_SPD[4:0]/…
93,
98,
104,
109,
114
I/OPU
4
Output After Reset = Used for 1st LED.
LEDMode[1:0]=11 -> Speed (On=100, Off=10)
LEDMode[1:0]=10 -> Speed (On=100, Off=10)
LEDMode[1:0]=01 -> Speed (On=100, Off=10)
LEDMode[1:0]=00 -> Reserved
Input Upon Reset = Refer to Table 9, on page 22, and Table 10, on
page 24.
LED_ACT[4:0]/…
92,
97,
103,
108,
113
I/OPU
4
Output After Reset = Used for 2nd LED.
LEDMode[1:0]=11 -> Link/Act: (On=Link, Off=No Link,
Flash=Tx or Rx activity)
LEDMode[1:0]=10 -> Act: (Off=No activity, On=Tx or Rx
activity)
LEDMode[1:0]=01 -> RxAct: (Off=No activity, On=Rx activity)
LEDMode[1:0]=00 -> Reserved
Input Upon Reset = Refer to Table 9, on page 22, and Table 10, on
page 24.
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