1893CFLFT IDT, 1893CFLFT Datasheet - Page 37

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

Specifications of 1893CFLFT

• Rohs: yes
• Part # Aliases: ICS1893CFLFT

6.5.7 10Base-T Operation: Carrier Detection
6.5.8 10Base-T Operation: Collision Detection
6.5.9 10Base-T Operation: Jabber
6.5.10 10Base-T Operation: SQE Test
ICS1893CK-40, Rev. C, 06/02/09
The ICS1893CK-40 has a 10Base-T Carrier Detection Function that establishes the state of its Carrier
Sense signal (CRS), based upon the state of its Transmit and Receive state machines. These functions
indicate whether the ICS1893CK-40 is (1) transmitting data, (2) receiving data, or (3) in a collision state
(that is, the ICS1893CK-40 is both transmitting and receiving data on its twisted-pair medium, as defined in
the ISO/IEC 8802-3 standard). When the ICS1893CK-40 is configured for:
•
•
The ICS1893CK-40 has a 10Base-T Collision Detection Function that establishes the state of its Collision
Detection signal (COL) based upon both (1) the state of its Receiver state machine and (2) the state of its
Transmit state machine. When the ICS1893CK-40 is operating in:
•
•
The ICS1893CK-40 has an ISO/IEC compliant Jabber Detection Function that, when enabled, monitors the
data stream sent to its Twisted-Pair Transmitter to ensure that it does not exceed the 10Base-T Jabber
activation time limit (that is, the maximum transmission time). For more information, see
“10Base-T: Jabber
When the Jabber Detection Function detects that its transmission time exceeds the maximum Jabber
activation time limit and Jabber Detection is enabled, the ICS1893CK-40 asserts its Collision Detect (COL)
signal. During this ISO/IEC specified ‘jabber de-activation time’, the ICS1893CK-40 transmit data stream is
interrupted and prevented from reaching its Twisted-Pair Transmitter. During this time, when interrupting
the data stream and asserting its COL signal, the ICS1893CK-40 transmits Normal Link Pulses and sets its
QuickPoll Detailed Status Register’s Jabber Detected bit (bit 17.2) to logic one. This bit is a latching high
(LH) bit. (For more information on latching high and latching low bits, see
Bits”
The ICS1893CK-40 provides an STA with the ability to disable the Jabber Detection Function using the
Jabber Inhibit bit (bit 18.5 in the 10Base-T Operations Register). Setting bit 18.5 to logic:
•
•
The ICS1893CK-40 has an ISO/IEC compliant Signal Quality Error (SQE) Test Function used exclusively
for 10Base-T operations. When enabled, the ICS1893CK-40 performs the SQE Test at the completion of
each transmitted packet (that is, whenever its TX_EN signal transitions from asserted to de-asserted).
When the ICS1893CK-40 executes its SQE Test, it asserts the COL signal to its MAC Interface for a
pre-determined time duration (ISO/IEC specified). [For more information, see
Heartbeat Timing
Half-duplex operations, the ICS1893CK-40 asserts its CRS signal when either transmitting or receiving
data.
Full-duplex operations, the ICS1893CK-40 asserts its CRS signal only when it is receiving data.
Half-duplex mode, the ICS1893CK-40 asserts its COL signal to indicate it is receiving data while
transmission of data is also in progress.
Full-duplex mode, the ICS1893CK-40 always sets its COL signal to FALSE.
Zero (the default) enables the Jabber Detection Function.
One disables the Jabber Detection Function.
and
ICS1893CK-40 Data Sheet Rev. C - Release
Section 7.1.4.2, “Latching Low
(SQE)”.]
Timing”.
Copyright © 2009, Integrated Device Technology, Inc.
Bits”.)
All rights reserved.
37
Section 7.1.4.1, “Latching High
Section 9.5.17, “10Base-T:
Chapter 6 Functional Blocks
Section 9.5.18,
June 2009