參數(shù)資料
型號: T8535
廠商: Lineage Power
元件分類: Codec
英文描述: Quad Programmable Codec(四通道可編程編解碼器)
中文描述: 四可編程編解碼器(四通道可編程編解碼器)
文件頁數(shù): 27/54頁
文件大?。?/td> 1872K
代理商: T8535
Lucent Technologies Inc.
27
Preliminary Data Sheet
July 2000
T8535/T8536 Quad Programmable Codec
Functional Description
(continued)
The Control Interface
(continued)
Write All Channels
The write all channels command causes all four channels to be loaded with the same coefficients with a single data
transfer from the master controller. This allows for a faster initialization of the device after a powerup. This com-
mand should be used with caution since it affects all four channels. The normal memory write and read commands
affect only one channel.
Reset Functionality
0071
Figure 20. Hardware Reset Procedure
The reset function allows the internal logic of the device to be set to a known initial condition, either externally by
activating the reset lead, or on a per-channel basis through the microprocessor interface by setting and then clear-
ing bits, if required, in address RESCTRL (address 128). These two reset functions have different effects, and
each of the software reset functions is a subset of the hardware reset functionality. The primary difference is in the
treatment of the internal memory. The hardware reset is assumed to be a result of a catastrophic hardware event,
such as a loss of power or an initial powerup. Accordingly, the assumption is made that the internal memory does
not contain valid data, and default values for all memory locations are loaded. A software reset, however, can only
be initiated if the device is operational (at least the microprocessor interface), so the contents of the memory may
indeed be valid; thus, the resets may be more specific. Additionally, software resets only affect the selected chan-
nel.
FS
BCLK
RST
DCLK
(GAPPED)
DCLK
(CONTINUOUS)
8 PULSES REQUIRED
DURING RESET
12 PULSES REQUIRED
AFTER RESET
NO GAP IS REQUIRED HERE.
8 PULSES REQUIRED
DURING RESET
12 PULSES REQUIRED
AFTER RESET
DEVICE
CAN NOW BE PROGRAMMED
WAIT
5 ms
RUNS CONTINUOUSLY
RUNS CONTINUOUSLY
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