5238-DS03-405-R datasheet(30/76 Pages) BOARDCOM

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BCM5238

Advance Data Sheet

1/31/03

Broa d c om Co rp o r a t i o n

Page 22

Serial LED Mode

Document

5238-DS03-405-R

PARALLEL LED MODE

There are two LED pins, LED1 and LED2, for each port. Each can be individually configured to output one of many PHY

status or forced signals. These two LEDs are referred to as parallel LEDs and they are always enabled. For unmanaged

system design using the BCM5238, the parallel LED pins for each port can be programmed through hardware during power-

on reset by pull-down or pull-up combinations of LED1{1:6} pins. See Table 12 and Table 13 for details.

Software configuration of LED1 and LED2 is accomplished through MII shadow register 1Ah, PHY 1, bits [5:0] if parallel LED

Select Enable, bit 9, of MII Shadow Register 1Ah, PHY 1 is set to a 1. The shadow register is enabled by setting bit 7 of MII

Note that in this mode, after the programming specified in Table 12 and Table 13 (either through power-on reset or through

software), LED1 and LED2 outputs provide the same status outputs for all eight ports.

Table 12: Parallel LED Mode LED1 Selection

LED1{3:1}

MII Shadow Register 1Ah, PHY 1, Bits [2:0]

Value

LED1 Selection

Power-on LED1 Select Bits [2:0]

LED1 Select [2:0]

Link

Speed

Activity

Full-duplex

4Transmit

5Receive

Interrupt

Collision

Note: MII shadow register is accessed by setting MII register 1Fh bit 7 to a 1.

Table 13: Parallel LED Mode LED2 Selection

LED1{6:4}

MII SHADOW REGISTER 1Ah, PHY 1, BITS [5:3] Value

LED2 Selection

Power-on LED2 Select Bits [2:0]

LED2 Select [2:0]

Speed

1Activity

Full-duplex

Transmit

Receive

Interrupt

Collision

7Link

Note: MII shadow register is accessed by setting MII register 1Fh bit 7 to a 1.

5238-DS03-405-R Datasheet(PDF) 30 Page - Broadcom Corporation.

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