參數(shù)資料
型號(hào)： AM79Q062JC
廠商： ADVANCED MICRO DEVICES INC
元件分類： 編解碼器
英文描述： A/MU-LAW, PCM CODEC, PQCC32
封裝： PLASTIC, LCC-32
文件頁(yè)數(shù)： 38/95頁(yè)
文件大?。?/td> 1399K
代理商： AM79Q062JC
SLAC Products
43
of PCLK then low for the third falling edge, it is
considered a robbed-bit frame. Otherwise, it is a
normal frame.
Figure 13. Robbed-Bit Frame
Default Filter Coefficients
The QSLAC device contains an internal set of default
coefficients for the programmable filters. These coeffi-
cients were determined to allow reasonable system
performance for initial power-up non-programmed situ-
ations, such as may exist before a system processor
has opportunity to program any coefficients.
The default filter coefficients are calculated assuming
an Am7920 SLIC with 50
protection resistors, a
178 k
transversal impedance (ZT), and a 90.5 k re-
ceive impedance (ZRX). This SLIC has a transmit gain
of 0.5 (GTX) and a current gain of 500 (K1). The trans-
mit relative level is set to +0.28 dBr, and the receive rel-
ative level is set to –4.39 dBr. The equalization filters (X
and R) are not optimized. The balance filter was de-
signed to give acceptable balance into a variety of im-
pedances. The nominal input impedance was set to
815
. If the SLIC circuit differs significantly from this
design, the default filters cannot be used and must be
replaced by programmed coefficients.
To obtain this above-system response, the default filter
coefficients are set to produce these values:
GX gain = +6 dB, GR gain = –8.984 dB
AX gain = 0 dB, AR gain = 0 dB
R filter: H(z) = 1, X filter: H(z) = 1
Z filter: H(z) = 0, B filter H(z) = 0
AISN = cutoff
Notice that these default coefficient values are
retained in a read-only memory area within the QSLAC
device, and those values cannot be read back using
any data commands. When the device is selected to
use default coefficients, it obtains those values directly
from the read-only memory area. The coefficient read
operations access the programmable random access
data memory only. If an attempt is made to read back
any filter values without those values first being written
with known programmed data, the values read back
are totally random and do not represent the default or
any other values.
COMMAND DESCRIPTION AND FORMATS
Microprocessor Interface Description
When PCM/MPI mode is selected via the CS/PG and
DCLK/S0 pins, a microprocessor can be used to
program the QSLAC device and control its operation
using the Microprocessor Interface (MPI). Data
programmed previously can be read out for verification.
Commands are provided to assign values to the
following channel parameters:
TTS
-
Transmit time slot
RTS
-
Receive time slot
TCS
-
Transmit clock slot
RCS
-
Receive clock slot
GX
-
Transmit gain
GR
-
Receive loss
B1, B2
-
B-filter coefficients
X
-
X-filter coefficients
R
-
R-filter coefficients
Z
-
Z-filter coefficients
AISN
-
AISN coefficient
CD1–C5
-
Read/Write SLIC Input/Output
IOD1–5
-
SLIC Input/Output Direction
A/
, C/L
-
Select A-law, -law, or linear code
TPCM, TAB -
Select Transmit PCM Port A or B
or both
RPCM
-
Select Receive PCM Port A or B
EB
-
Programmed/Default B filter
EZ
-
Programmed/Default Z filter
EX
-
Programmed/Default X filter
ER
-
Programmed/Default R filter
EGX
-
Programmed/Default GX filter
EGR
-
Programmed/Default GR filter
AX
-
Enable/disable AX amplifier
AR
-
Enable/disable AR amplifier
TP
-
Cutoff Transmit Path
CRP
-
Cutoff Receive Path
HPF
-
Disable High Pass Filter
LRG
-
Lower Receive Gain
ATI
-
Arm Transmit Interrupt
ILB
-
Interface Loopback
FDL
-
Full Digital Loopback
TON
-
1 kHz Tone On
CS
-
Select Active or Inactive
(standby) mode
Commands are provided to read values from the
following channel monitors:
PCLK
FS
Normal Frame (Not Robbed-Bit)
PCLK
FS
Robbed-Bit Frame
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