參數(shù)資料
型號(hào)： T8538B
元件分類： Codec
英文描述： T8538B Quad Programmable Codec
中文描述： T8538B四可編程編解碼器
文件頁(yè)數(shù)： 14/44頁(yè)
文件大小： 847K
代理商： T8538B
14
Agere Systems Inc.
Preliminary Data Sheet
August 2001
T8538B Quad Programmable Codec
Functional Description
(continued)
The Control Interface
(continued)
Read Command
The normal flow of information to the master controller is always in response to a read command. All control mem-
ory locations are accessed in 8-bit bytes. All read commands from the master controller require a response from
the addressed codec. It is the responsibility of the master controller to ensure that only one device is transmitting
on the serial interface line at any one time. The master controller must also ensure that the CS lead goes high after
transferring the 3-byte sequence used to initiate the read, and then it goes low again for the response. In this case,
it should be noted that the device expects that the second time CS goes low, the data is to be sent to the master;
thus, it does not interpret the DI lead as containing a valid instruction during that CS excursion. Note that the CS
lead must allow the number of bytes sent in a read command to be transferred before a subsequent command can
be received by the codec. Figures 10—13 illustrate normal or byte-by-byte operation with continuous or gapped
DCLKs. Like a write command, transitions, not frequency, are critical with regard to gapped DCLK operation.
0079B
* Provides sufficient wait time to access read data.
Allow a minimum of 244 ns before the next command frame.
Note: Data field length of 1 shown.
Figure 10. Read Operation, Normal Mode (Continuous DCLK)
COMMAND FRAME
0
1
7
0
1
7
CS
DCLK
DI
COMMAND
START ADDRESS
DATA
0
1
7
0
1
7
0
1
7
LENGTH
0
1
7
0
1
7
0
1
7
DO
WAIT
≥
1.5
μ
s
*
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