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參數(shù)資料
| 型號： | AT75C1010 |
| 英文描述： | AT75C1010 Telephony Software Module [Updated 11/01. 29 Pages] This software module runs on the OakDSPCore subsystem of the AT75 series SIAP. expanding its capabilities and making the processor flexible and east to integrate into most operating systems. |
| 中文描述： | AT75C1010電話軟件模塊[更新11/01。 29頁]本軟件模塊上運行的AT75系列OakDSPCore子系統(tǒng)統(tǒng)計所。擴大其能力，使處理器的靈活和東部地區(qū)融入大多數(shù)操作系統(tǒng)。 |
| 文件頁數(shù)： | 72/171頁 |
| 文件大?。?/td> | 1288K |
| 代理商： | AT75C1010 |
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163
AT75C DSP Subsystem
1368C–INTAP–08/02
Codec Interface
Operation
This section describes the standard operation of the codec interface, reviewing the dif-
ferent modes available.
Master Mode
The external codec device and the codec interface are said to be in the master mode
when the external codec device delivers the serial clock (SCLK) and the frame sync
(FS) information. This mode allows the AT75C and the codec device to be fully asyn-
chronous (i.e., with separate clock sources) because the synchronization is maintained
by the SCLK and FS signals. This insures that the codec device will deliver a new sam-
ple when it is available and will accept a new sample when it is able to, according to its
own conversion timing.
The master mode is recommended because it leads to robust synchronization between
the codec device and the application software and does not require accurate timing
calculations.
Figure 14 illustrates an AT75C and a codec device connection in master mode.
Figure 14. Connection of a Codec Device in Master Mode
Note that programming FS and SCLK to be in opposite directions is not recommended.
Slave Mode
In slave mode the serial clock (SCLK) and the frame sync (FS) signals are delivered by
the AT75C. To achieve data synchronization between the AT75C and the codec device,
the following rules must be respected:
The AT75C system clock and the codec device clock must be kept in sync.
The SCLK generator in the AT75C must be programmed to generate a serial clock
with a frequency compatible with the codec device.
Because the AT75C initiates the transfers, the FS generator must be accurately
programmed so that data are exchanged when the codec device is ready to
accept/deliver them.
The slave mode operation is not recommended in a typical design because it has strong
requirements on the overall system clock strategy and requires fine tuning of the AT75C
codec interface. However, it allows the accommodation of some industry-standard
codec devices provided that the rules described above are followed.
Figure 15 illustrates an AT75C and a codec device connection in slave mode.
Codec Device
AT75C310
SDO
SDI
SCLK
FS
SDI
SDO
Asynchronous
Clocks
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