1893AFLF IDT, 1893AFLF Datasheet - Page 73

• Manufacturer Part Number: 1893AFLF
• Description: Ethernet ICs 3.3V 10/100 BASE TX INTEGRATED PHYCEIVER
• Manufacturer: IDT
• Type: Integrated PHY Transceiverr

Specifications of 1893AFLF

• Rohs: yes
• Product: Ethernet Transceivers
• Data Rate: 10 Mb/s, 100 Mb/s
• Supply Voltage - Max: 3.47 V
• Supply Voltage - Min: 3.14 V
• Maximum Operating Temperature: + 70 C
• Package / Case: SSOP-48
• Ethernet Connection Type: 100Base-TX, 10Base-T
• Maximum Supply Current: 160 mA
• Minimum Operating Temperature: 0 C
• Standard Supported: 802.3
• Part # Aliases: ICS1893AFLF

8.6.3 Remote Fault (bit 4.13)
8.6.4 IEEE Reserved Bits (bits 4.12:10)
ICS1893AF, Rev. D 10/26/04
When this reserved bit is read by an STA, the ICS1893AF returns a logic zero. However, whenever an STA
writes to this reserved bit, it must use the default value specified in this data sheet. ICS uses some reserved
bits to invoke auxiliary functions. To ensure proper operation of the ICS1893AF, an STA must maintain the
default value of these bits. Therefore, ICS recommends that an STA always write the default value of any
reserved bits during all management register write operations.
Reserved bit 4.14 is a Command Override Write (CW) bit. Whenever bit 16.15 (the Command Register
Override bit) is logic:
•
•
When the ICS1893AF Auto-Negotiation sublayer is enabled, the ICS1893AF transmits the Remote Fault bit
4.13 to its remote link partner during the auto-negotiation process. The Remote Fault bit is part of the Link
Code Word that the ICS1893AF exchanges with its remote link partner. The ICS1893AF sets this bit to logic
one whenever it detects a problem with the link, locally. The data in this register is sent to the remote link
partner to inform it of the potential problem. If the ICS1893AF does not detect a link fault, it clears bit 4.13
to logic zero.
Whenever the ICS1893AF:
•
•
The IEEE reserves these bits for future use. When an STA:
•
•
The ICS1893AF uses some reserved bits to invoke auxiliary functions. To ensure proper operation of the
ICS1893AF, an STA must maintain the default value of these bits. Therefore, ICS recommends that during
any STA write operation, an STA write the default value to all reserved bits, even those bits that are Read
Only.
Zero, the ICS1893AF isolates all STA writes to bit 4.14.
One, an STA can modify the value of bit 4.14.
Does not detect a link fault, the ICS1893AF clears bit 4.13 to logic zero.
Detects a problem with the link, during the auto-negotiation process, this bit is set. As a result, the data
on this bit is sent to the remote link partner to inform it of the potential problem.
Reads a reserved bit, the ICS1893AF returns a logic zero.
Writes to a reserved bit, it must use the default value specified in this data sheet.
ICS1893AF Data Sheet - Release
Copyright © 2004, Integrated Circuit Systems, Inc.
All rights reserved.
73
Chapter 8 Management Register Set
October, 2004