82V2041EPPG IDT, Integrated Device Technology Inc, 82V2041EPPG Datasheet - Page 17

82V2041EPPG

Manufacturer Part Number

82V2041EPPG

Description

Manufacturer

IDT, Integrated Device Technology Inc

Datasheet

1.82V2041EPPG.pdf (75 pages)

Specifications of 82V2041EPPG

Number Of Transceivers

Screening Level

Industrial

Mounting

Surface Mount

Package Type

TQFP

Operating Temperature (min)

-40C

Operating Temperature (max)

85C

Lead Free Status / RoHS Status

Compliant

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3.3.3.2 USER-PROGRAMMABLE ARBITRARY WAVEFORM

waveform generator mode can be used. This allows the transmitter perfor-

mance to be tuned for a wide variety of line condition or special application.

UI[1:0] bits (TCF3, 08H) and each UI is divided into 16 sub-phases,

addressed by the SAMP[3:0] bits (TCF3, 08H). The pulse amplitude of each

phase is represented by a binary byte, within the range from +63 to -63,

stored in WDAT[6:0] bits (TCF4, 09H) in signed magnitude form. The most

positive number +63 (D) represents the positive maximum amplitude of the

transmit pulse while the most negative number -63 (D) represents the max-

imum negative amplitude of the transmit pulse. Therefore, up to 64 bytes

are used.

User can select one of them as reference and make some changes to get

the desired waveform.

pulse shape. In order to do this, firstly, users can choose a set of waveform

value from the following eight tables, which is the most similar to the desired

pulse shape. Table-2, Table-3, Table-4, Table-5, Table-6, Table-7,

and

plates. Then modify the corresponding sample data to get the desired trans-

mit pulse shape.

by 1, the pulse amplitude can be scaled up or down at the percentage ratio

against the standard pulse amplitude if needed. For different pulse shapes,

the value of SCAL[5:0] bits and the scaling percentage ratio are different.

The following eight tables list these values.

grammed, based on the selected waveform template:

from the internal RAM.

Functional Description

IDT82V2041E

There are eight standard templates which are stored in an on-chip ROM.

When the PULS[3:0] bits are set to ‘11xx’, user-programmable arbitrary

Each pulse shape can extend up to 4 UIs (Unit Interval), addressed by

User can change the wave shape and the amplitude to get the desired

Secondly, through the value of SCAL[5:0] bits increased or decreased

Do the followings step by step, the desired waveform can be pro-

(1).Select the UI by UI[1:0] bits (TCF3, 08H)

(2).Specify the sample address in the selected UI by SAMP [3:0] bits

(3).Write sample data to WDAT[6:0] bits (TCF4, 09H). It contains the

(4).Set the RW bit (TCF3, 08H) to ‘0’ to implement writing data to RAM,

(5).Implement the Read from RAM/Write to RAM by setting the DONE

Repeat the above steps until all the sample data are written to or read

Table-9

(TCF3, 08H)

data to be stored in the RAM, addressed by the selected UI and the

corresponding sample address.

or to ‘1’ to implement read data from RAM

bit (TCF3, 08H)

list the sample data and scaling data of each of the eight tem-

Table-8

SINGLE CHANNEL T1/E1/J1 SHORT HAUL LINE INTERFACE UNIT

lap of two consecutive pulses could make the pulse amplitude overflow

(exceed the maximum limitation) if the pulse amplitude is not set properly.

This overflow is captured by DAC_OV_IS bit (INTS1, 1AH), and, if enabled

by the DAC_OV_IM bit (INTM1, 15H), an interrupt will be generated.

templates in detail for reference. For preset pulse templates, scaling up/

down against the pulse amplitude is not supported.

Table-2 Transmit Waveform Value For E1 75 ohm

SCAL[5:0] = 100001 (default), One step change of this value of SCAL[5:0]

results in 3% scaling up/down against the pulse amplitude.

When more than one UI is used to compose the pulse template, the over-

4.Table-5

5.Table-6

6.Table-7

7.Table-8

8.Table-9

(6).Write the scaling data to SCAL[5:0] bits (TCF2, 07H) to scale the

The following tables give all the sample data based on the preset pulse

1.Table-2

2.Table-3

Sample

Table-4

amplitude of the waveform based on the selected standard pulse

amplitude

Transmit Waveform Value For E1 75 Ω

Transmit Waveform Value For E1 120 Ω

Transmit Waveform Value For T1 133~266 ft

Transmit Waveform Value For T1 266~399 ft

Transmit Waveform Value For T1 399~533 ft

Transmit Waveform Value For T1 533~655 ft

Transmit Waveform Value For J1 0~655 ft

Transmit Waveform Value For T1 0~133 ft

0000000

0001100

0110000

0000000

UI 1

0000000

UI 2

0000000

UI 3

December 9, 2005

0000000

UI 4

82V2041EPPG IDT, Integrated Device Technology Inc, 82V2041EPPG Datasheet - Page 17

82V2041EPPG

Specifications of 82V2041EPPG

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