RTL8305SC
Datasheet
5-port 10/100Mbps Single-Chip Dual MII Switch Controller
22
Track ID: JATR-1076-21 Rev. 1.2
5.7. Serial EEPROM and SMI Pins
As the output of the RTL8305SC is 3.3V, the serial EEPROM and external device must be 3.3V
compatible.
Table 8. Serial EEPROM and SMI Pins
Pin Name
Pin No.
Type
Drive (mA) Description
SCL_MDC
74
I/OPU
4
SCL or MDC
This pin is tri state when pin RESET#=0.
When pin EnEEPROM=1, this pin becomes SCL (output) to load the
serial EEPROM upon reset. Then this pin changes to MDC (input)
after reset.
When pin EnEEPROM=0, this pin is MDC (input): 0 to 25MHz clock,
sourced by an external device to sample MDIO.
SDA_MDIO
75
I/OPU
4
SDA or MDIO
This pin is tri state when RESET#=0.
When pin EnEEPROM=1, this pin becomes SDA (input/output) to
load the serial EEPROM upon reset. Then this pin changes to MDIO
(input/output) after reset. It should be pulled-high by an external
resistor.
When pin EnEEPROM=0, this pin is MDIO (input/output). It should
be pulled-high by an external resistor.
5.8. Strapping Pins
Pins that are dual function pins are outputs for LED or inputs for strapping. Below are strapping
descriptions only.
Table 9. Strapping Pins
Pin Name
Pin No.
Type
Drive (mA) Description
EN_AUTOXOVER
69
IPU
Enable Auto crossover function
1: Enable auto crossover detection
0: Disable auto crossover detection. MDI only
EN_RST_BLNK
71
IPU
Enable Reset Blink
This enables blinking of the LEDs upon reset for diagnostic
purposes.
1: Enable reset LED blinking
0: Disable reset LED blinking
DisTagPri
/LED_ADD[4]
91
I/OPU
4
Input Upon Reset = Disable 802.1p VLAN Tag priority based
QoS function.
1: Disable
0: Enable
Output After Reset = Used for LED.
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