CS8900-CQ3 Cirrus Logic, CS8900-CQ3 Datasheet - Page 62
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CS8900-CQ3
Manufacturer Part Number
CS8900-CQ3
Description
Crystal LAN ISA Ethernet Controller
Manufacturer
Cirrus Logic
Datasheet
1.CS8900-CQ3.pdf
(128 pages)
- Current page: 62 of 128
- Download datasheet (2Mb)
4.4.15 Register 10: Transmit Collision Counter
(TxCOL, Read-only, Address: PacketPage base + 0132h)
The TxCOL counter (Bits 6 through F) is incremented whenever the 10BASE-T Receive Pair (RXD+ / RXD-) or AUI
Collision Pair (CI+ / CI-) becomes active while a packet is being transmitted. If the TxColOvfiE bit (Register B,
BufCFG, Bit C) is set, there is an interrupt when TxCOL increments from 1FFh to 200h. This interrupt provides the
host with an early warning that the TxCOL counter should be read before it reaches 3FFh and starts over (by inter-
rupting at 200h, the host has an additional 512 counts before TxCOL actually overflows). The TxCOL counter is
cleared when read.
010010
ColCount
Reset value is: 0000 0000 0001 0010
62
7
F
ColCount
Collision Counter. When reading this register, these bits will be 010010, where the LSB corre-
sponds to Bit 0.
These bits provide an internal address used by the CS8900A to identify this as the Transmit
The upper ten bits contain the number of collisions.
6
E
D
5
CIRRUS LOGIC PRODUCT DATA SHEET
C
4
ColCount
B
3
Crystal LAN™ ISA Ethernet Controller
010010
A
2
1
9
CS8900A
DS271PP3
0
8
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