CDK8920A View Datasheet(PDF) - Cirrus Logic
Part Name
Description
MFG CO.
'CDK8920A' PDF : 144 Pages View PDF
CS8920A
Register 1C: AUI Time Domain Reflectometer (Read-only)
Address: PacketPage base + 013Ch
F-6
AUI_Delay
5-0
011100
The TDR counter (Bits 6 through F) is a time domain reflectometer useful in locating cable faults in 10BASE-2
and 10BASE-5 coax networks. It counts at a 10-MHz rate from the beginning of transmission on the AUI to when
a collision or Loss-of-Carrier error occurs. The TDR counter is cleared when read.
BIT NAME
DESCRIPTION
5-0 011100
These bits provide an internal address used by the CS8920A to identify this as the
Bus Status Register. When reading this register, these bits will be 011100, where the
LSB corresponds to Bit 0.
F-6 AUI-Delay
The upper ten bits contain the number of 10-MHz clock periods between the beginning
of transmission on the AUI to when a collision or Loss-of-Carrier error occurs.
This register’s initial state after reset is: 0000 0000 0001 1100
DS238PP2
69
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