參數(shù)資料
型號: SI3050-E1-GT
廠商: Silicon Laboratories Inc
文件頁數(shù): 64/128頁
文件大小: 0K
描述: IC VOICE DAA SYSTEM SIDE 24QFN
標(biāo)準(zhǔn)包裝: 74
系列: *
Si3050 + Si3011/18/19
40
Rev. 1.5
5.32. PCM Highway
The Si3050 contains a flexible programmable interface for the transmission and reception of digital PCM samples.
PCM data transfer is controlled via the PCLK and FSYNC inputs, the PCM Transmit and Receive Start Count
registers (Registers 34–37), and the PCM Mode Select register (Register 33). The interface can be configured to
support from 4 to 128 8-bit timeslots in each frame, which corresponds to PCLK frequencies of 256 kHz to
8.192 MHz in power of 2 increments. Time slot assignment and data delay from FSYNC edge are handled via the
TXS and RXS registers. These 10-bit values are programmed with the number of PCLK cycles following the rising
edge of FSYNC until the data transfer begins. Because the Si3050 looks for the rising edge of FSYNC, both long
and short FSYNC pulse widths can be accommodated. A value of 0 in the PCM Transmit and Receive Start Count
registers signifies that the MSB of the data should occur in the same cycle as the rising edge of FSYNC.
Table 20. PCM or GCI Highway Mode Selection
SCLK
SDI
Mode Selected
1
X
PCM Mode
0
GCI Mode,
B2 Channel used
0
1
GCI Mode,
B1 Channel used
Note:
Values shown are the states of the pins at the rising edge of
RESET.
Table 21. Pin Functionality in PCM or GCI Highway Mode
Pin Name
PCM Mode
GCI Mode
SDI_THRU
SPI Data Throughput pin for Daisy Chaining
Operation (Connects to the SDI pin of the
subsequent device in the daisy chain)
Sub-frame
Selector, bit 2
SCLK
SPI Clock Input
PCM/GCI Mode Selector
SDI
SPI Serial Data Input
B1/B2 Channel Selector
SDO
SPI Serial Data Output
Sub-frame
Selector, bit 1
CS
SPI Chip Select
Sub-frame
Selector, bit 0
FSYNC
PCM Frame Sync Input
GCI Frame Sync Input
PCLK
PCM Input Clock
GCI Input Clock
DTX
PCM Data Transmit
GCI Data Transmit
DRX
PCM Data Receive
GCI Data Receive
Note:
This table denotes pin functionality after the rising edge of RESET and mode selection.
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