TCM4400E Datasheet, PDF (46/64 Pages) Texas Instruments – GSM/DCS BASEBAND AND VOICE A/D AND D/A RF INTERFACE CIRCUIT

TCM4400E
GSM/DCS BASEBAND AND VOICE A/D
AND D/A RF INTERFACE CIRCUIT
SLWS082A – JULY 1999 – REVISED MARCH 2000
PRINCIPLES OF OPERATION
baseband uplink data buffer
The baseband uplink data buffer is used to transmit the uplink burst data. The uplink data buffer contents are
shown in Table 8.
Table 8. Uplink Data Buffer
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _{BULDATA: BASEBAND UPLINK DATA BUFFER}
ADDRESS: 2 (16 WORDS)
W
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _{BIT0 BIT1 BIT2 BIT3 BIT4 BIT5 BIT6 BIT7 BIT8 BIT9 0}
0
0
1
0
0
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _{BIT10 BIT11 BIT12 BIT13 BIT14 BIT15 BIT16 BIT17 BIT18 BIT19 0}
0
0
1
0
0
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ BIT20 BIT21 BIT22 BIT23 BIT24 BIT25 BIT26 BIT27 BIT28 BIT29 0
0
0
1
0
0
BIT30 BIT31 BIT32 BIT33 BIT34 BIT35 BIT36 BIT37 BIT38 BIT39 0
0
0
1
0
0
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _{BIT40 BIT41 BIT42 BIT43 BIT44 BIT45 BIT46 BIT47 BIT48 BIT49 0}
0
0
1
0
0
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _{BIT50 BIT51 BIT52 BIT53 BIT54 BIT55 BIT56 BIT57 BIT58 BIT59 0}
0
0
1
0
0
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _{BIT60 BIT61 BIT62 BIT63 BIT64 BIT65 BIT66 BIT67 BIT68 BIT69 0}
0
0
1
0
0
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _{BIT70 BIT71 BIT72 BIT73 BIT74 BIT75 BIT76 BIT77 BIT78 BIT79 0}
0
0
1
0
0
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _{BIT80 BIT81 BIT82 BIT83 BIT84 BIT85 BIT86 BIT87 BIT88 BIT89 0}
0
0
1
0
0
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _{BIT90 BIT91 BIT92 BIT93 BIT94 BIT95 BIT96 BIT97 BIT98 BIT99 0}
0
0
1
0
0
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ BIT100 BIT101 BIT102 BIT103 BIT104 BIT105 BIT106 BIT107 BIT108 BIT109 0
0
0
1
0
0
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ BIT110 BIT111 BIT112 BIT113 BIT114 BIT115 BIT116 BIT117 BIT118 BIT119 0
0
0
1
0
0
BIT120 BIT121 BIT122 BIT123 BIT124 BIT125 BIT126 BIT127 BIT128 BIT129 0
0
0
1
0
0
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _{BIT130 BIT131 BIT132 BIT133 BIT134 BIT135 BIT136 BIT137 BIT138 BIT139 0}
0
0
1
0
0
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _{BIT140 BIT141 BIT142 BIT143 BIT144 BIT145 BIT146 BIT147 BIT148 BIT149 0}
0
0
1
0
0
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _{BIT150 BIT151 BIT152 BIT153 BIT154 BIT155 BIT156 BIT157 BIT158 BIT159 0}
0
0
1
0
0
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _W
W
W
W
W
W
W
W
W
W
<–––ACCESS TYPE
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ₁
1
1
1
1
1
1
1
1
1
<–––VALUE AT RESET
Bit 0 – Bit 159 are the bits composing the sequence of the transmitted burst, bit 0 is transmitted first. For a normal
burst, the uplink data buffer is loaded as follows:
Bit 0 to 3
: 4 guard bits
Bit 4 to 6
: 3 tail bits
Bit 7 to 66
: 58 data bits
Bit 67 to 92 : 26 training sequence bits
Bit 93 to 92 : 58 training sequence bits
Bit 151 to 153 : 3 tail bits
Bit 154 to 159 : 8 guard bits
At reset and after each transmission, the burst buffer is reinitialized with guard bits (all bits = 1). An address
pointer is incremented after each word written into the buffer so that next write operation affects the next word
of the buffer. This address pointer is set to the base address (Word 0) by a RESET, after transmission of a burst
or by setting the IBUFPTR bit to 1( this bit has to be set back to zero to release the address pointer).
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