CS8900-CQ3 Cirrus Logic, CS8900-CQ3 Datasheet - Page 70

• Manufacturer Part Number: CS8900-CQ3
• Description: Crystal LAN ISA Ethernet Controller
• Manufacturer: Cirrus Logic

4.4.23 Register 1C: AUI Time Domain Reflectometer
(Read-only, Address: PacketPage base + 013Ch)
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 col-
lision or Loss-of-Carrier error occurs. The TDR counter is cleared when read.
011100
AUI-Delay
Reset value is: 0000 0000 0001 1100
70
7
F
AUI Delay
Register. When reading this register, these bits will be 011100, where the LSB corresponds to
Bit 0.
transmission on the AUI to when a collision or Loss-of-Carrier error occurs.
These bits provide an internal address used by the CS8900A to identify this as the Bus Status
The upper ten bits contains the number of 10 MHz clock periods between the beginning of
6
E
D
5
CIRRUS LOGIC PRODUCT DATA SHEET
C
4
AUI Delay
B
3
Crystal LAN™ ISA Ethernet Controller
011100
A
2
1
9
CS8900A
DS271PP3
0
8