82P2821BH IDT, Integrated Device Technology Inc, 82P2821BH Datasheet - Page 37

• Manufacturer Part Number: 82P2821BH
• Manufacturer: IDT, Integrated Device Technology Inc

Specifications of 82P2821BH

• Number Of Transceivers: 1
• Screening Level: Industrial
• Mounting: Surface Mount
• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Lead Free Status / RoHS Status: Not Compliant

3.3.4.2 User-Programmable Arbitrary Waveform
programmable arbitrary waveform will be used in the corresponding
channel.
divided into 20 sub-phases that are addressed by the SAMP[4:0] bits
(b4~0, AWG0,...). The waveform amplitude of each phase is repre-
sented by a binary byte, within the range from +63 to -63, stored in the
WDAT[6:0] bits (b6~0, AWG1,...) in signed magnitude form. The
maximum number +63 (D) represents the maximum positive amplitude
of the transmit pulse while the most negative number -63 (D) represents
the maximum negative amplitude of the transmit pulse. Therefore, up to
20 bytes are used.
One of them can be selected as reference and made some changes to
get the desired waveform.
standard templates. The selected waveform value should be the most
similar to the desired waveform shape. Table-7 to Table-14 list the
sample data of each template.
shape. By increasing or decreasing by ‘1’ from the standard value in the
SCAL[5:0] bits (b5~0, SCAL,...), the waveform amplitude will be scaled
up or down.
Functional Description
IDT82P2821
When the PULS[3:0] bits (b3~0, PULS,...) are set to ‘1XXX’, user-
Each waveform shape can extend up to
There are eight standard templates which are stored in a local ROM.
To do this, the first step is to choose a set of waveform value from the
Then modify the sample data to get the desired transmit waveform
1
1
-- -
4
UIs (Unit Interval), and is
21(+1) CHANNEL HIGH-DENSITY T1/E1/J1 LINE INTERFACE UNIT
37
SCAL[5:0] bits (b5~0, SCAL,...) to scale the amplitude of the selected
standard waveform (- this step is optional).
and the waveform amplitude is not set properly, the overlap of the two
consecutive waveforms will make the waveform amplitude overflow (i.e.,
exceed the maximum limitation). This overflow is captured by the
DAC_IS bit (b7, INTS0,...) and will be reported by the INT pin if enabled
by the DAC_IM bit (b7, INTM0,...).
Waveform for DSX1’ for more details.
In summary, do the following for the write operation:
• Modify the sample data in the AWG1 register;
• Write the AWG0 register to implement the write operation, includ-
Do the following for the read operation:
• Write the AWG0 register, including:
• Read the AWG1 register to get the sample data.
When the write operation is completed, write the scaling value to the
When more than one UI is used to compose the waveform template
Refer to application note AN-513 ‘User-Programmable Arbitrary
ing:
- Write the sample address to the SAMP[4:0] bits (b4~0,
- Write ‘0’ to the RW bit (b5, AWG0,...);
- Write ‘1’ to the DONE bit (b6, AWG0,...).
- Write sample address to the SAMP[4:0] bits (b4~0, AWG0,...);
- Write ‘1’ to the RW bit (b5, AWG0,...);
- Write ‘1’ to the DONE bit (b6, AWG0,...);
AWG0,...);
February 6, 2009