Broadcom BCM5722 - Table 507: Expansion Register 13 H: Cable Diagnostic Lengths Channels 3;4

BCM5722 Programmer’s Guide
10/15/07
Broadcom Corporation
Page 443 Transceiver Registers Document 5722-PG101-R
EXPANSION REGISTER 13H: CABLE DIAGNOSTIC LENGTHS CHANNELS 3/4
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] = F13h, and read/write access is through register 15h.
Channel 4 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 3 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 2 in meters.
Table 507: Expansion Register 13h: Cable Diagnostic Lengths Channels 3/4
Bit Field Description Init Access
15:8 Channel 4 length Channel 4 Open/Short Length or Cable Length (meters).
• 00000000 = 0m.
• 00000001 = 1m.
• 00000010 = 2m.
• ...
• 10000000 = 128m.
00h RO
7:0 Channel 3 length Channel 3 Open/Short Length or Cable Length (meters).
• 00000000 = 0m.
• 00000001 = 1m.
• 00000010 = 2m.
• ...
• 10000000 = 128m.
00h RO