ST802RT1B datasheet(42/58 Pages) STMICROELECTRONICS

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Device operation

ST802RT1A, ST802RT1B

42/58

Doc ID 17049 Rev 1

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.

●

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.

Table 31.

LED configuration

Mode

RN1B[9]

LED link

LED speed

LED act/col

ON for link-up

OFF for no link

BLINK for link-up + activity

ON for 100Mb

OFF for 10Mb

ON for full-duplex

BLINK for collision

ON for link-up

OFF for no link

ON for 100Mb

OFF for 10Mb

BLINK for activity

Figure 6.

LED connections

ST802RT1B 数据表(PDF) 42 Page - STMicroelectronics

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