DP83848J datasheet(28/78 Pages) NSC

部件名	DP83848J

功能描述	PHYTER짰 Mini LS Commercial Temperature Single Port 10/100 Ethernet Transceiver

Download	78 Pages

Scroll/Zoom	100%

制造商	NSC [National Semiconductor (TI)]

网页	http://www.national.com

标志

28 / 78 page

www.national.com

28

4.2.2.2 Base Line Wander Compensation

The DP83848J is completely ANSI TP-PMD compliant

and includes Base Line Wander (BLW) compensation.

The BLW compensation block can successfully recover

the TP-PMD defined “killer” pattern.

BLW can generally be defined as the change in the aver-

age DC content, relatively short period over time, of an AC

coupled digital transmission over a given transmission

medium. (i.e., copper wire).

BLW results from the interaction between the low fre-

quency components of a transmitted bit stream and the

frequency response of the AC coupling component(s)

within the transmission system. If the low frequency con-

tent of the digital bit stream goes below the low frequency

pole of the AC coupling transformers then the droop char-

acteristics of the transformers will dominate resulting in

potentially serious BLW.

The digital oscilloscope plot provided in Figure 9 illus-

trates the severity of the BLW event that can theoretically

be generated during 100BASE-TX packet transmission.

This event consists of approximately 800 mV of DC offset

for a period of 120

µs. Left uncompensated, events such

as this can cause packet loss.

4.2.3 Signal Detect

The signal detect function of the DP83848J is incorpo-

rated to meet the specifications mandated by the ANSI

FDDI TP-PMD Standard as well as the IEEE 802.3

100BASE-TX Standard for both voltage thresholds and

timing parameters.

Note that the reception of normal 10BASE-T link pulses

and fast link pulses per IEEE 802.3u Auto-Negotiation by

the 100BASE-TX receiver do not cause the DP83848J to

assert signal detect.

4.2.4 MLT-3 to NRZI Decoder

The DP83848J decodes the MLT-3 information from the

Digital Adaptive Equalizer block to binary NRZI data.

4.2.5 NRZI to NRZ

In a typical application, the NRZI to NRZ decoder is

required in order to present NRZ formatted data to the

descrambler.

4.2.6 Serial to Parallel

The 100BASE-TX receiver includes a Serial to Parallel

converter which supplies 5-bit wide data symbols to the

PCS Rx state machine.

Figure 9. 100BASE-TX BLW Event

类似零件编号 - DP83848J

制造商	部件名	数据表	功能描述
National Semiconductor ...	DP83848J	872Kb / 72P	PHYTER짰 Mini LS Commercial Temperature Single Port 10/100 Ethernet Transceiver
	DP83848J	912Kb / 72P	PHYTER짰 Mini / PHYTER짰 Mini LS Commercial Temperature Single Port 10/100 Ethernet Tran
	DP83848J	1,015Kb / 78P	PHYTER짰 Mini LS Commercial Temperature Single Port 10/100 Ethernet Transceiver
Texas Instruments	DP83848J	705Kb / 80P	[Old version datasheet] DP83848J PHYTER Mini LS Commercial Temperature Single Port 10/100 Mb/s Ethernet Transceiver
Texas Instruments	DP83848J	705Kb / 81P	[Old version datasheet] PHYTER Mini LS Commercial Temperature Single Port 10/100 Mb/s Ethernet Transceiver

More results

类似说明 - DP83848J

制造商	部件名	数据表	功能描述
National Semiconductor ...	DP83848J	872Kb / 72P	PHYTER짰 Mini LS Commercial Temperature Single Port 10/100 Ethernet Transceiver
	DP83848J	1,015Kb / 78P	PHYTER짰 Mini LS Commercial Temperature Single Port 10/100 Ethernet Transceiver
	DP83848M	912Kb / 72P	PHYTER짰 Mini / PHYTER짰 Mini LS Commercial Temperature Single Port 10/100 Ethernet Tran
	DP83848K	1Mb / 78P	PHYTER짰 Mini LS Industrial Temperature Single Port 10/100 Ethernet Transceiver
	DP83848M	1Mb / 80P	PHYTER짰 Mini - Commercial Temperature Single 10/100 Ethernet Transceiver
	DP83848H	880Kb / 72P	PHYTER짰 Mini - Extreme Temperature Single 10/100 Ethernet Transceiver
	DP83848T	1Mb / 81P	PHYTER짰 Mini - Industrial Temperature Single 10/100 Ethernet Transceiver
Texas Instruments	DP83848J	705Kb / 81P	[Old version datasheet] PHYTER Mini LS Commercial Temperature Single Port 10/100 Mb/s Ethernet Transceiver
Texas Instruments	DP83848K	712Kb / 81P	[Old version datasheet] PHYTER Mini LS Industrial Temperature Single Port 10/100 Ethernet Transceiver
National Semiconductor ...	DP83848C	2Mb / 84P	PHYTER짰 - Commercial Temperature Single Port 10/100 Mb/s Ethernet Physical Layer Transceiver