ST802RT1B 查看數據表（PDF） - STMicroelectronics

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ST802RT1B

10/100 real-time Ethernet 3.3 V transceiver

STMicroelectronics 

Device operation

ST802RT1A, ST802RT1B

Write 0180h to RN12 to set INT_EN and INT_OE_N;

Write 0010h to RN12 to set LK_DWN_EN;

Monitor PWRDWN/MDINT.

When the PWRDWN/MDINT pin asserts low, the user should read the RN11 register to see

if the LK_DWN is set, i.e. which source caused the interrupt.

7.11

LED display operation

The ST802RT1x provides 3 LED pins. Table 31 contains a detailed description of the

operating modes, also described in Table 4: Pin functions of the ST802RT1x.

Table 31.

Mode

1

2

LED configuration

RN1B[9]

LED link

ON for link-up

1

OFF for no link

BLINK for link-up + activity

ON for link-up

0

OFF for no link

LED speed

ON for 100Mb

OFF for 10Mb

ON for 100Mb

OFF for 10Mb

LED act/col

ON for full-duplex

BLINK for collision

BLINK for activity

● Link LED: On when 100 M or 10 M link is active. It also blinks at 10 Hz for transmit and

receive.

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

● Activity LED: Blinks at 20 Hz when there is a half-duplex activity on the media. It is

driven on continuously if full-duplex configuration is detected, or blinks when a collision

is detected.

Figure 6. LED connections

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Doc ID 17049 Rev 1

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