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參數(shù)資料
| 型號： | TLFD600 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | GT 4C 2#8 2#16 PIN RECP WALL |
| 中文描述： | 寬帶編解碼器帶有集成線路驅(qū)動器和接收 |
| 文件頁數(shù)： | 8/36頁 |
| 文件大?。?/td> | 502K |
| 代理商： | TLFD600 |
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TLFD600
ADSL CODEC WITH INTEGRATED LINE DRIVER AND RECEIVER
SLAS280B
–
MAY 2000
–
REVISED NOVEMBER 2000
8
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
clock generation (continued)
Table 2. Clock Description
FREQUENCY (MHz)
CLOCK
CLKOUT_EN = 1
SYMMETRY
CLK1SEL = 0
CLK1SEL = 1
SCLK
35.328
35.328
50/50
CLK1OUT
20.187
15.701
43/57 for 20.187
44/56 for 15.701
CLK2OUT
4.096
4.096
49/51
serial interface
The serial interface on the TLFD600PAP will connect gluelessly to the C5000 or C6000 families of DSPs from
Texas Instruments. The serial interface operates at 35.328 MHz. The serial port is made up of five signals:
SCLK, FSX, FSR, SDX, and SDR. A typical connection diagram is shown in Figure 2.
CLKR
CLKX
FSX
FSR
DX
DR
SCLK
FSR
FSX
SDR
SDX
DSP
TLFD600PAP
Figure 2. Typical Serial Port Connection
The serial port utilizes a primary/secondary scheme to transfer conversion data and control register data
(command). A primary transfer is used to transfer conversion data. A secondary transfer is used to transfer
control data when requested by the host processor. The host processor requests a secondary transfer by using
the LSB of the SDR data of the primary transfer. A value of 1 indicates a secondary transfer request. Once the
secondary request is made and the primary transfer has completed, a secondary FSR pulse is transmitted to
the host processor to indicate the beginning of the secondary transfer. The secondary FSR signal arrives 48
SCLKs after the host processor request. Each bit is read/written at the rising edge of SCLK clock. Data bit
mappings and example data transfers are shown in Table 3.
Table 3. SDR LSB Control Function
CONTROL BIT D0
CONTROL BIT FUNCTION
0
No secondary transfer requested
1
Secondary transfer requested
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