CRD8900-1 View Datasheet(PDF) - Cirrus Logic
Part Name
Description
MFG CO.
'CRD8900-1' PDF : 132 Pages View PDF
CS8900
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 CS8900 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 contains 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
DS150PP2
67
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