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PDF S5N8950 Data sheet ( Hoja de datos )
| Número de pieza | S5N8950 | |
| Descripción | G.dmt ADSL Transceiver for CO and CPE | |
| Fabricantes | Samsung semiconductor | |
| Logotipo |  |
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S5N8950
G.dmt ADSL Transceiver for CO and CPE
Preliminary Information Rev.1.2
Nov. 2000.
SAMSUNG ELECTRONICS CONFIDENTIAL PROPRIETARY
Copyright ¨ Ï2000 Samsung Electronics, Inc. All Rights Reserved.
1 page  
S5N8950
G.dmt ADSL Transceiver for CO and CPE
U_RX_DATA_5 121
U_RX_DATA_6 122
U_RX_DATA_7 123
U_RX_ADDR_0 124
VDD3O 125
VSS3O 126
U_RX_ADDR_1 127
U_RX_ADDR_2 128
U_RX_ADDR_3 129
U_RX_ADDR_4 130
U_RX_ENB 131
U_RX_SOC 132
U_RX_CLK 133
U_RX_CLAV 134
VDD1I 135
VSS1I 136
P_VDD18A2 137
P_VSS18A2 138
P_PLL_FILTER 139
P_VDD18A1 140
P_VSS18A1 141
P_VBBA 142
S1_TX_DAV 143
S1_TX_CLK 144
VDD3P 145
VSS3P 146
S1_RX_DATA 147
S1_RX_DAV 148
P_XTAL_IN 149
P_XTAL_OUT 150
S1_TX_DATA 151
S1_RX_CLK 152
S2_TX_DATA 153
S2_TX_DAV 154
VDD1I 155
VSS1I 156
S2_TX_CLK 157
S2_RX_DATA 158
S2_RX_DAV 159
S2_RX_CLK 160
S5N8950
G.dmt ADSL Transceiver for CO and CPE
80 A_SDI
79 A_AND
78 A_SEN
77 VSS1I
76 VDD1I
75 A_SDO
74 A_SCLK
73 A_BUSY
72 A_RX_PWR
71 A_TX_PWR
70 A_PME
69 VSS3P
68 VDD3P
67 A_RSTN
66 A_AD_AUX_CLK
65 A_AD_REF_CLK
64 A_AD_DATA_6
63 A_AD_DATA_5
62 A_AD_DATA_4
61 VSS1I
60 VDD1I
59 A_AD_DATA_3
58 A_AD_DATA_2
57 A_AD_DATA_1
56 A_AD_DATA_0
55 A_DA_AUX_CLK
54 A_DA_REF_CLK
53 VSS3O
52 VDD3O
51 A_DA_DATA_6
50 A_DA_DATA_5
49 A_DA_DATA_4
48 A_DA_DATA_3
47 A_DA_DATA_2
46 A_DA_DATA_1
45 VSS1I
44 VDD1I
43 A_AD_DATA_0
42 UA_RX_DATA
41 UA_TX_DATA
Figure 3: Pin configuration
CONFIDENTIAL
Preliminary Information ( Rev 1.2 )
5 Page 
S5N8950
G.dmt ADSL Transceiver for CO and CPE
samples are fixed by the sync recovery algorithm using a known synchronization symbol. The TEQ is a
filter that adaptively alters the channel so that the impulse response is reduced to the length of the cyclic
prefix which will be removed prior to FFT. The FEQ is a one tap complex adaptive filter for each sub-
channel, which adjusts the gains and phases of the received signals. The equalizers are adaptively updated
due to the transmission channel environment.
In FDM-based DMT modulation, the frequency band, 0 to 1.104 MHz, is divided into 256 equi-spaced
sub-channels, of which 26 KHz (#6) to 134 KHz (#31) is allocated for the upstream, and 142 KHz (#33)
to 1.100 MHz (#255) for the downstream. The Nyquist rate, therefore, should be 2.208 MHz (276kHz).
DMT inherently transmits an optimized time-variable spectrum. This spectrum is adjusted according to
the desired data rate and the transmission characteristics (transfer function and noise spectrum) on each
and every sub-channel. For this, CO and CPE transmit 128.4 KHz wide tone downstream and upstream
respectively to each other during initialization. They measure the quality of each of these received tones
and then decided whether a tone has sufficient quality to be used for further transmission and, if so, how
much data this tone should carry relative to the other tones that are used. They inform the bit lo9ading
result to each other.
CONFIDENTIAL
Preliminary Information ( Rev 1.2 )
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet S5N8950.PDF ] | |
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