1893CKLFT IDT, 1893CKLFT Datasheet - Page 47

• Manufacturer Part Number: 1893CKLFT
• Description: Ethernet ICs 3.3V 10/100 BASE TX INTEGRATED PHYCEIVER
• Manufacturer: IDT

Specifications of 1893CKLFT

• Rohs: yes
• Part # Aliases: ICS1893CKLFT

7.2.2 Loopback Enable (bit 0.14)
7.2.3 Data Rate Select (bit 0.13)
7.2.4 Auto-Negotiation Enable (bit 0.12)
ICS1893CK-40, Rev. C, 06/02/09
This bit controls the Loopback mode for the ICS1893CK-40. Setting this bit to logic:
•
•
This bit provides a means of controlling the ICS1893CK-40 data rate.
•
This bit provides a means of controlling the ICS1893CK-40 Auto-Negotiation sublayer.
•
Zero disables the Loopback mode.
One enables the Loopback mode by disabling the Twisted-Pair Transmitter, the Twisted-Pair Receiver,
and the collision detection circuitry. (The STA can override the ICS1893CK-40 from disabling the
collision detection circuitry in Loopback mode by writing logic one to bit 0.7.) When the ICS1893CK-40 is
in Loopback mode, the data presented at the MAC transmit interface is internally looped back to the
MAC receive interface. The delay from the assertion of Transmit Data Enable (TXEN) to the assertion of
Receive Data valid (RXDV) is less than 512 bit times.
The function of bit 0.13 depends on the Auto-Negotiation Enable bit 0.12. When the Auto-Negotiation
sublayer is:
Bit 0.12 determines whether to enable the Auto-Negotiation sublayer. When bit 0.12 is logic:
– Enabled, the ICS1893CK-40 isolates bit 0.13 and relies on the results of the auto-negotiation
– Disabled, bit 0.13 determines the data rate. In this case, setting bit 0.13 to logic:
– Zero:
– One:
process to establish the data rate.
• Zero selects 10-Mbps ICS1893CK-40 operations.
• One selects 100-Mbps ICS1893CK-40 operations.
• The ICS1893CK-40 disables the Auto-Negotiation sublayer.
• The ICS1893CK-40 bit 0.13 (the Data Rate bit) and bit 0.8 (the Duplex Mode bit) determine the
• The ICS1893CK-40 enables the Auto-Negotiation sublayer.
• The ICS1893CK-40 isolates bit 0.13 and bit 0.8.
data rate and the duplex mode.
ICS1893CK-40 Data Sheet Rev. C - Release
Copyright © 2009, Integrated Device Technology, Inc.
All rights reserved.
47
Chapter 7 Management Register Set
June 2009