ICS1893CFILF datasheet(37/126 Pages) ICST

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Chapter 6 Functional Blocks

ICS1893CF, Rev. F, 03/01/07

Mar. 2007

ICS1893CF Data Sheet Rev. F - Release

6.5.7 10Base-T Operation: Carrier Detection

The ICS1893CF 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 ICS1893CF is (1) transmitting data, (2) receiving data, or (3) in a collision state (that is, the

ICS1893CF is both transmitting and receiving data on its twisted-pair medium, as defined in the ISO/IEC

8802-3 standard). When the ICS1893CF is configured for:

• Half-duplex operations, the ICS1893CF asserts its CRS signal when either transmitting or receiving

data.

• Full-duplex operations, the ICS1893CF asserts its CRS signal only when it is receiving data.

6.5.8 10Base-T Operation: Collision Detection

The ICS1893CF 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 ICS1893CF is operating in:

• Half-duplex mode, the ICS1893CF asserts its COL signal to indicate it is receiving data while

transmission of data is also in progress.

• Full-duplex mode, the ICS1893CF always sets its COL signal to FALSE.

6.5.9 10Base-T Operation: Jabber

The ICS1893CF 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 Section 9.5.18,

“10Base-T: Jabber Timing”.

When the Jabber Detection Function detects that its transmission time exceeds the maximum Jabber

activation time limit and Jabber Detection is enabled, the ICS1893CF asserts its Collision Detect (COL)

signal. During this ISO/IEC specified ‘jabber de-activation time’, the ICS1893CF 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 ICS1893CF 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 Section 7.1.4.1, “Latching High

Bits” and Section 7.1.4.2, “Latching Low Bits”.)

The ICS1893CF 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:

• Zero (the default) enables the Jabber Detection Function.

• One disables the Jabber Detection Function.

6.5.10 10Base-T Operation: SQE Test

The ICS1893CF has an ISO/IEC compliant Signal Quality Error (SQE) Test Function used exclusively for

10Base-T operations. When enabled, the ICS1893CF 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

ICS1893CF 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 Section 9.5.17, “10Base-T: Heartbeat Timing

(SQE)”.]

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