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參數(shù)資料
| 型號： | T7536 |
| 廠商： | Lineage Power |
| 元件分類： | Codec |
| 英文描述： | 16-Channel Programmable Codec Chip Set(十六通道可編程編解碼器芯片組) |
| 中文描述： | 16通道可編程解碼器芯片組（十六通道可編程編解碼器芯片組） |
| 文件頁數(shù)： | 22/44頁 |
| 文件大?。?/td> | 772K |
| 代理商： | T7536 |
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22
Lucent Technologies Inc.
Data Sheet
February 1999
Codec Chip Set
T7531A/T7536 16-Channel Programmable
Chip Set Functional Description
(continued)
Autocalibration
Autocalibration is an analog self-test and trimming pro-
cedure controlled by the DSP core. Sine wave signals
are generated in the receive direction. These signals
are looped back at the analog side of the T7536, and
the return signal amplitudes are measured in the trans-
mit path. This procedure provides on-the-spot fault cov-
erage of the transmit and receive paths. It also
calibrates the octal devices by modifying the gain on
each channel. Channel four of the T7536 is the only
channel trimmed at the factory for absolute gain accu-
racy. When autocalibration is run, all channels are
trimmed with reference to channel four. That is, the
gain on each channel is adjusted so that its absolute
gain is equivalent to that of the trimmed channel. Per-
forming trimming in this manner provides channel-to-
channel gain matching of better than 0.01 dB. This is a
much better performance than could be achieved using
conventional trimming. Trimmed values are placed in
data storage, and absolute gain values are then modi-
fied accordingly any time the absolute gain register is
changed.
The calibration sequence measures the looped-back
power result and compares it to the calibrated channel.
The trim window is
±
0.2 dB. If any channel exhibits a
power value which is greater than
±
0.2 dB, the calibra-
tion procedure sets a failure flag for that channel. Trim-
ming will not be performed on the failed channel, and
the channel’s trimmed gain will be left at 0 dB. The
failed channel, therefore, is left in its previous state and
can still be used. The results of calibration are held in
RAM address 0x07F4 for transmit (pass 1) and 0x07F5
for receive (pass 2). A bit is set high for every failed
channel.
The preceding section discussed the sequence of
instructions that must be followed in order to properly
configure the T7531A for normal operation. The auto-
calibration procedure is mandatory after hardware
reset.
User Test Features
This section outlines the T7531A test features and
architecture. For more information on the board-test
capabilities, see the T7531A/T7536 User Manual
Off-Line Programmable System Test Capability
The T7531A has a standard 4-pin test access port
known as JTAG that can be used for testing and debug-
ging. The user has the option of downloading custom
firmware to the DSP engine RAM via the JTAG port,
and running it in the DSP engine in place of the normal
ROM-based code. The DSP16 hardware development
tool provides a powerful user interface for real-time
code development and debug. The user can also exe-
cute the self-test ROM routine which exercises signifi-
cant portions of the T7531A and T7536 devices.
On-Line Per-Channel Test Capability
In addition to the active (i.e., normal voice processing
functions) and inactive routines, the user can select the
routines listed in Table 41 by altering the TX and RX
routines address in the time-slot information table (see
Table 6).
Inactive Mode with Loopback
This is a pair of routines that are used for the TX and
RX parts of the channel. Data from SDR is looped back
without modification to SDX.
Self-Test and Board-Test Routines
Using the following routines, programs can be written
to test not only the codec function but also all attached
circuitry, like the SLIC, relays, protection devices, and
cabling.
Tone Generation
In tone generation mode, the RX part of the channel is
used to send a sine wave signal out to the line. The
sine wave can be up to 4 kHz in frequency, and up to
1024 points long. The RX filter is not implemented in
tone generation.
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