參數(shù)資料
型號(hào)： IDT82V1074
廠商： Integrated Device Technology, Inc.
元件分類： Codec
英文描述： CHIPSET OF RINGING SUBSCRIBER LINE INTERFACE CIRCUIT (RSLIC) & QUAD PROGRAMMABLE PCM CODEC
中文描述： 芯片組振鈴用戶線接口電路（RSLIC）
文件頁(yè)數(shù)： 91/375頁(yè)
文件大?。?/td> 2430K
代理商： IDT82V1074
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IDT82P2281
SINGLE T1/E1/J1 LONG HAUL / SHORT HAUL TRANSCEIVER
80
October 7, 2003
To meet the template, two preset waveform templates are provided
corresponding to two kinds of cable impedance. The selection is made
by the PULS[3:0] bits. In internal impedance matching mode, if the cable
impedance is 75
, the PULS[3:0] bits should be set to ‘0000’; if the
cable impedance is 120
, the PULS[3:0] bits should be set to ‘0001’. In
external impedance matching mode, for both 75
and 120
cable
impedance, the PULS[3:0] bits should be set to ‘0001’.
3.24.2
LINE BUILD OUT (LBO) (T1 ONLY)
In long haul applications, the output on the TTIP/TRING pins
should be attenuated before transmission to prevent the cross-talk in the
far end. Three LBOs are used to implement the pulse attenuation. Four
grades of attenuation with each step of 7.5 dB are specified in the FCC
Part 68 Regulations. The attenuation grade is selected by the PULS[3:0]
bits. The details are listed in Table 61.
3.24.3
USER-PROGRAMMABLE ARBITRARY WAVEFORM
User-programmable arbitrary waveform can be used in both short
haul applications and long haul applications if the PULS[3:0] bits are set
to ‘11XX’. This allows the transmitter performance to be tuned for a wide
variety of line condition or special application.
Each pulse shape can extend up to 4 UIs (Unit Interval) addressed
by the UI[1:0] bits, and each UI is divided into 16 sub-phases addressed
by the SAMP[3:0] bits. The pulse 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 in signed magnitude form. The maximum number +63
(D) represents the positive maximum amplitude of the transmit pulse
while the most negative number -63 (D) represents the maximum nega-
tive amplitude of the transmit pulse. Thus, up to 64 bytes are used. For
each channel, a 64 bytes RAM is available.
There are twelve standard templates which are stored in a local
ROM. One of them can be selected as reference and made some
changes to get the desired waveform.
To do this, the first step is to choose a set of waveform value, which
is the most similar to the desired pulse shape, from the following 12
tables (Table 62 to Table 73), and set the SCAL[5:0] bits to the corre-
sponding standard value. Table 62 to Table 73 list the sample data and
the standard scaling value of each of the 12 templates.
Modifying the corresponding sample data can get the desired
transmit pulse shape. By increasing or decreasing by ‘1’ from the stan-
dard value in the SCAL[5:0] bits, the pulse amplitude can be scaled up
or down at the percentage ratio against the standard pulse amplitude if
necessary. For different pulse shapes, the value of the SCAL[5:0] bits
and the scaling percentage ratio are different. The values are listed in
Table 62 to Table 73.
Do the followings step by step, the desired waveform can be pro-
grammed based on the selected waveform template:
1. Select the UI by the UI[1:0] bits;
2. Specify the sample address in the selected UI by the SAMP[3:0]
bits;
3. Write sample data to the WDAT[6:0] bits. It contains the data to
be stored in the RAM, addressed by the selected UI and the correspond-
ing sample address;
4. Set the RW bit to ‘0’ to write data to RAM, or to ‘1’ to read data
from RAM;
5. Set the DONE bit to implement the read or write operation;
(Repeat the above steps until all the sample data are written to or
read from the internal RAM).
6. Write the scaling data to the SCAL[5:0] bits to scale the ampli-
tude of the waveform based on the selected standard pulse amplitude.
Table 62 to Table 73 give all the sample data based on preset pulse
templates and LBOs in details for reference. For preset pulse templates
and LBOs, scaling up/down against the pulse amplitude is not sup-
ported.
1. Table 62 - Transmit Waveform Value For E1 75
2. Table 63 - Transmit Waveform Value For E1 120
3. Table 64 - Transmit Waveform Value For T1 0~133 ft
4. Table 65 - Transmit Waveform Value For T1 133~266 ft
5. Table 66 - Transmit Waveform Value For T1 266~399 ft
6. Table 67 - Transmit Waveform Value For T1 399~533 ft
7. Table 68 - Transmit Waveform Value For T1 533~655 ft
8. Table 69 - Transmit Waveform Value For J1 0~655 ft
9. Table 70 - Transmit Waveform Value For DS1 0 dB LBO
10. Table 71 - Transmit Waveform Value For DS1 -7.5 dB LBO
11. Table 72 - Transmit Waveform Value For DS1 -15.0 dB LBO
12. Table 73 - Transmit Waveform Value For DS1 -22.5 dB LBO
Table 61: LBO PULS[3:0] Setting In T1 Mode
Cable Configuration
PULS[3:0]
0 dB LBO
-7.5 dB LBO
-15.0 dB LBO
-22.5 dB LBO
0 0 1 0
1 0 0 1
1 0 1 0
1 0 1 1
相關(guān)PDF資料
PDF描述
IDT82V1074PF CHIPSET OF RINGING SUBSCRIBER LINE INTERFACE CIRCUIT (RSLIC) & QUAD PROGRAMMABLE PCM CODEC
IDT82V1671 CHIPSET OF RINGING SUBSCRIBER LINE INTERFACE CIRCUIT (RSLIC) & QUAD PROGRAMMABLE PCM CODEC
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IDT82V2058 OCTAL E1 SHORT HAUL LINE INTERFACE UNIT
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參數(shù)描述
IDT82V1074PF 制造商:IDT 制造商全稱:Integrated Device Technology 功能描述:CHIPSET OF RINGING SUBSCRIBER LINE INTERFACE CIRCUIT (RSLIC) & QUAD PROGRAMMABLE PCM CODEC
IDT82V1671 制造商:IDT 制造商全稱:Integrated Device Technology 功能描述:CHIPSET OF RINGING SUBSCRIBER LINE INTERFACE CIRCUIT (RSLIC) & QUAD PROGRAMMABLE PCM CODEC
IDT82V1671J 制造商:IDT 制造商全稱:Integrated Device Technology 功能描述:CHIPSET OF RINGING SUBSCRIBER LINE INTERFACE CIRCUIT (RSLIC) & QUAD PROGRAMMABLE PCM CODEC
IDT82V2041E 制造商:IDT 制造商全稱:Integrated Device Technology 功能描述:SINGLE CHANNEL T1/E1/J1 SHORT HAUL LINE INTERFACE UNIT
IDT82V2041EPP 功能描述:IC LIU T1/J1/E1 1CH 44-TQFP RoHS:否 類別:集成電路 (IC) >> 接口 - 驅(qū)動(dòng)器，接收器，收發(fā)器 系列:- 標(biāo)準(zhǔn)包裝:250 系列:- 類型:收發(fā)器 驅(qū)動(dòng)器/接收器數(shù):2/2 規(guī)程:RS232 電源電壓:3 V ~ 5.5 V 安裝類型:表面貼裝 封裝/外殼:16-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:16-TSSOP 包裝:帶卷 (TR)
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