IDT82P5088BBG IDT, Integrated Device Technology Inc, IDT82P5088BBG Datasheet - Page 18

• Manufacturer Part Number: IDT82P5088BBG
• Description: IC LIU T1/E1/J1 OCTAL 256PBGA
• Manufacturer: IDT, Integrated Device Technology Inc

Specifications of IDT82P5088BBG

• Includes: Integrated Clock Adapter
• Function: Line Interface Unit (LIU)
• Interface: E1, J1, T1
• Number Of Circuits: 8
• Voltage - Supply: 1.8V, 3.3V
• Power (watts): 2.57W
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 256-BBGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Supply: -

‘0111’.
3.2.3.2 LBO (Line Build Out)
be attenuated before transmission for long haul applications. The FCC Part
68 Regulations specifies four grades of attenuation with a step of 7.5 dB.
Three LBOs are used to implement the pulse attenuation. The PULS[3:0]
bits (TCF1, 23H...) are used to select the attenuation grade. Both
and
3.2.3.3 User-Programmable Arbitrary Waveform
waveform generator mode can be used in the corresponding channel. This
allows the transmitter performance to be tuned for a wide variety of line con-
dition or special application.
UI[1:0] bits (TCF3, 25H...) and each UI is divided into 16 sub-phases,
addressed by the SAMP[3:0] bits (TCF3, 25H...). 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, 26H...) in signed magnitude form. The
most positive 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 64
bytes are used. For each channel, a 64 bytes RAM is available.
FUNCTIONAL DESCRIPTION
IDT82P5088
Note: R
For J1 applications, the PULS[3:0] (TCF1, 23H...) should be set to
To prevent the cross-talk at the far end, the output of TTIP/TRING could
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
IDT82P5088
Table-16
-0.2
-0.4
-0.6
1.2
0.8
0.6
0.4
0.2
Table-14
1
0
LOAD
0
Figure-6 T1 Pulse Template Test Circuit
Figure-5 DSX-1 Waveform Template
= 100 Ω ± 5%
list these values.
lists these values.
TTIPn
TRINGn
250
500
Time (ns)
750
Cable
1000
R
LOAD
UNIVERSAL OCTAL T1/E1/J1 LIU WITH INTEGRATED CLOCK ADAPTER
Table-14
1250
V
OUT
18
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 twelve tables, which is the most similar to the
desired pulse shape. Table-2, Table-3, Table-4, Table-5, Table-6, Table-7,
Table-8, Table-9, Table-10, Table-11,
data and scaling data of each of the twelve templates. Then modify the cor-
responding sample data to get the desired transmit 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 twelve tables list these values.
grammed, based on the selected waveform template:
from the internal RAM.
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_IS bit (INTS1, 3BH...), and, if enabled
by the DAC_IE bit (INTENC1, 34H...), an interrupt will be generated.
templates and LBOs in detail for reference. For preset pulse templates and
LBOs, scaling up/down against the pulse amplitude is not supported.
There are twelve standard templates which are stored in a local ROM.
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, 25H...)
(2).Specify the sample address in the selected UI by SAMP [3:0] bits
(3).Write sample data to WDAT[6:0] bits (TCF4, 26H...). It contains the
(4).Set the RW bit (TCF3, 25H...) 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
(6).Write the scaling data to SCAL[5:0] bits (TCF2, 24H...) to scale the
When more than one UI is used to compose the pulse template, the over-
The following tables give all the sample data based on the preset pulse
1.Table-2
2.Table-3
3.Table-4
4.Table-5
5.Table-6
6.Table-7
7.Table-8
8.Table-9
9.Table-10
10.Table-11
11.Table-12
(TCF3, 25H...)
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, 25H...)
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 0~133 ft
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 DS1 0 dB LBO
Transmit Waveform Value For DS1 -7.5 dB LBO
Transmit Waveform Value For DS1 -15.0 dB LBO
Table-12
and
Table-13
February 5, 2009
list the sample