Broadcom BCM5722 - Table 506: Expansion Register 12 H: Cable Diagnostic Lengths Channels1;2

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Programmer’s Guide BCM5722

10/15/07

Broadcom Corporation

Document 5722-PG101-R Transceiver Registers Page 442

Open/Short Found

Bits [11:8] reflect the open and short status of the four channels.

Finished

Bits [7:4] reflect whether Open/Short and Length checking have been completed successfully.

All Finished

Bit [0] reflects whether all four channels have completed cable diagnostic processing.

EXPANSION REGISTER 12H: CABLE DIAGNOSTIC LENGTHS CHANNELS 1/2

The Following Expansion registers are enabled by writing to “Expansion Register Access Register (PHY_ADDR = 0x1,

Reg_Addr = 17h)” on page 434 bits [11:0] = F12h, and read/write access is through register 15h.

Channel 2 Length

When the BCM5722 Ethernet controller detects an open or short on the cable, bits [15:8] reflect how far away the open or

short is from the BCM5722 Ethernet controller. When no open or short is detected, bits [15:8] reflect the cable length

connected to channel 2 in meters.

Channel 1 Length

When the BCM5722 Ethernet controller detects an open or short on the cable, bits [7:0] reflect how far away the open or

short is from the BCM5722 Ethernet controller. When no open or short is detected, bits [7:0] reflect the cable length

connected to channel 1 in meters.

Table 506: Expansion Register 12h: Cable Diagnostic Lengths Channels1/2

Bit Field Description Init Access

15:8 Channel 2 Length Channel 2 Open/Short Length or Cable Length (meters).

• 00000000 = 0m.

• 00000001 = 1m.

• 00000010 = 2m.

• ...

• 10000000 = 128m.