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)： 86/95頁(yè)
文件大小： 1399K
代理商： AM79Q062JC
SLAC Products
87
In the QSLAC device, a coefficient, hi, consists of N CSD
coefficients, each being made up of 4 bits and formatted
as Cxy mxy, where Cxy is 1 bit (MSB) and mxy is 3 bits.
Each CSD coefficient is broken down as follows:
Cxy
is the sign bit (0 = positive, 1 = negative).
mxy
is the 3-bit shift code. It is encoded as a binary
number as follows:
000:
0 shifts
001:
1 shifts
010:
2 shifts
011:
3 shifts
100:
4 shifts
101:
5 shifts
110:
6 shifts
111:
7 shifts
y
is the coefficient number (the i in hi).
x
is the position of this CSD coefficient within the hi
coefficient. The most significant binary 1 is
represented by x = 1. The next most significant
binary 1 is represented by x = 2, and so on.
Thus, C13 m13 represents the sign and the relative shift
position for the first (most significant) binary 1 in the
fourth (h3) coefficient.
The number of CSD coefficients, N, is limited to four in
the GR, GX, R, X, and Z filters; four in the IIR part of
the B filter; three in the FIR part of the B filter; and two
in the post-gain factor of the Z-IIR filter. Note also that
the GX filter coefficient equation is slightly different
from the other filters.
Equation 8
Please refer to the Summary of MPI Commands section
for complete details on programming the coefficients.
User Test Modes and Operating
Conditions
The QSLAC device supports testing by providing test
modes and special operating conditions as shown in
Figure 12 (see Operating Conditions Register).
Cutoff Transmit Path (CTP): When CTP = 1, DX and
TSC are High impedance and the transmit time slot does
not exist. This mode takes precedence over the TSA
Loopback (TLB) and Full Digital Loopback (FDL) modes.
Cutoff Receive Path (CRP): When CRP = 1, the re-
ceive signal is forced to 0 just ahead of the low pass filter
(LPF) block. This mode also blocks Full Digital Loop-
back (FDL), the 1 kHz receive tone, and the B-filter path.
High Pass Filter Disable (HPF): When HPF = 1, all
of the High pass and notch filters in the transmit path
are disabled.
Lower Receive Gain (LRG): When LRG = 1, an extra
6.02 dB of loss is inserted into the receive path.
Arm Transmit Interrupt (ATI) and Read Transmit
PCM Data (PCM/MPI mode only): The read transmit
PCM data command, Command 47, can be used to
read transmit PCM data through the microprocessor
interface. If the ATI bit is set, an interrupt is generated
whenever new transmit data appears in the channel and
is cleared when the data is read. When combined with
Tone Generation and Loopback modes, this allows the
microprocessor to test channel integrity.
Interface Loopback (ILB): When ILB = 1, data from
the receive/downstream path is looped back to the
transmit/Upstream path. Any other data in the transmit
path is overwritten.
Full Digital Loopback (FDL): When FDL = 1, the
VOUT output is turned off and the analog output voltage
is routed to the input of the receive path, replacing the
voltage from VIN. The AISN path is temporarily turned
off. This test mode can also be entered by writing the
code 10000 into the AISN register.
1 kHz Receive Tone (TON): When TON = 1, a 1 kHz
digital mW is injected into the receive path, replacing
any receive or downstream signal.
h
iGX
1h
i
+
=
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