E-STE100P データシートの表示（PDF） - STMicroelectronics

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E-STE100P

10/100 FAST ETHERNET 3.3V TRANSCEIVER

STMicroelectronics 

STE100P

7.9 LED Display Operation

The STE100P provides 5 LED pins, the detail descriptions about the operation are described in the PIN

Description section, and as follows.

■ Speed LED: 100Mbps(on) or 10Mbps(off)

■ Receive LED: Blinks at 10Hz when receiving, but not colliding

■ Transmit LED: Blinks at 10Hz when transmitting, but not colliding

■ Link LED: On when 100M or 10M link ok

■ Collision LED: Blinks at 20Hz to indicate a collision

7.10 Reset Operation

There are two ways to reset the STE100P. First, for hardware reset, the STE100P can be reset via RESET

pin (pin 28). The active low Reset input signal is required at least 1 ms to ensure proper reset operation.

Second, for software reset, when bit 15 of register PR0 is set to 1, the STE100P will reset entire circuits

and registers to their default values, then clear the bit 15 of PR0 to 0, and set the RIP output pin 29 to logic

1. Both hardware and software reset operations initialize all registers to their default values. This process

includes re-evaluation of all hardware-configurable registers. Logic levels on several I/O pins are detected

during hardware reset period to determine the initial functionality of STE100P. Some of these pins are

used as outputs after the reset operation. Care must be taken to ensure that the configuration setup will

not interfere with normal operation. Dedicated configuration pins can be tied to the Vcc or ground directly.

Configuration pins multiplexed with LED outputs should be weakly pulled up or weakly pulled down

through resistors as shown in the following circuits.

Figure 5.

Figure 6.

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