5238-DS03-405-R datasheet(61/76 Pages) BOARDCOM

61 / 76 page

Advance Data Sheet

BCM5238

1/31/03

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

Document

5238-DS03-405-R

Auxiliary Status 2 Register (Shadow Register)

Page 53

AUXILIARY MODE 4 (PHY 8 OF 8) REGISTER (SHADOW REGISTER)

See “LED Display Output Modes” on page 18 for details of all available configuration.

AUXILIARY STATUS 2 REGISTER (SHADOW REGISTER)

MLT3 Detected. The BCM5238 returns a 1 in this bit whenever MLT3 signaling is detected.

Cable Length 100X[2:0]. The BCM5238 provides the cable length for each port when a 100-TX link is established.

Table 46: Auxiliary Mode 4 (PHY 8 of 8) Register (Shadow Register 26d, 1Ah)

BIt

Name

R/W

Description

Default

15:6

Reserveda

a. When writing to this register, preserve existing values of reserved bits by completing a Read/Modify Write.

–

00110

00000

5:3

Extended LED2 for PHY 8 of

8 Select[2:0]

R/W

Configuration bits for LED2 output for PHY 8 of 8

(see “LED Display Output Modes” on page 18 for

details)

2:0

Extended LED1 for PHY 8 of

8 Select[2:0]

R/W

Configuration bits for LED1 output for PHY 8 of 8

(see “LED Display Output Modes” on page 18 for

details)

Note: R/W = Read/Write, RO = Read only, SC = Self Clear, LL = Latched Low, LH = Latched High, LL and LH Clear

after read operation. Use default values of reserved bit(s) when writing to reserved bit(s). MII shadow register bank 1 is

accessed by setting MII register 1Fh bit 7 to a 1.

Table 47: Auxiliary Status 2 Register (Shadow Register 27d, 1Bh)

BIt

Name

R/W

DESCRIPTION

Default

MLT3 Detected

R/O

1 = MLT3 detected

14:12

Cable Length 100X[2:0]

R/O

The BCM5238 shows the cable length in 20-meter

increments as shown in Table 48.

000

11:6

ADC Peak Amplitude[5:0]

R/O

A to D peak amplitude seen

00h

APD Enable

R/W

0 = Normal mode

1 = Enable auto power-down mode

APD Sleep Timer

R/W

0 = 2.5-second sleep before wake up

1= 5.0-second sleep before wake up

3:0

APD Wake-Up Timer[3:0]

R/W

Duration of wake up

0001

Note: R/W = Read/Write, RO = Read only, SC = Self Clear, LL = Latched Low, LH = Latched High, LL and LH Clear

after read operation. Use default values of reserved bit(s) when writing to reserved bit(s). MII shadow register bank 1 is

accessed by setting MII register 1Fh bit 7 to a 1.

Table 48: 100-TX Port Cable Length

Cable Length 100X[2:0]

Cable Length in Meters

000

< 20

001

20 to < 40

010

40 to < 60

5238-DS03-405-R Datasheet(PDF) 61 Page - Broadcom Corporation.

5238-DS03-405-R Datasheet(HTML) 61 Page - Broadcom Corporation.

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76

Datasheet Download

Link URL