參數(shù)資料
型號(hào)： T8535B
元件分類： Codec
英文描述： T8535B/T8536B Quad Programmable Codec
中文描述： T8535B/T8536B四可編程編解碼器
文件頁(yè)數(shù)： 20/50頁(yè)
文件大?。?/td> 929K
代理商： T8535B
20
Agere Systems Inc.
Preliminary Data Sheet
September 2001
T8535B/T8536B Quad Programmable Codec
Functional Description
(continued)
The Control Interface
(continued)
Read Command
(continued)
0075B
* Shows customary usage, CS not required to go high between bytes.
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 15. Read Operation, Byte-by-Byte Mode (Continuous DCLK)
Fast Scan Mode
The fast scan mode allows a single byte command to read two SLIC control leads for all four channels with a
1-byte reply. This mode significantly speeds up the normal scanning for off-hook, ring trip, and ring ground detec-
tion. This special command sequence allows the controlling microprocessor to fast scan 2 bits in the SLIC control
byte of each of the four channels. The command code is (00000010)
2
; there are no start address or length fields.
The command returns only a single byte of data, formatted as shown in Table 9.
Table 9. Bit Assignments for Fast Scan Mode
Bit
Reported Status
0 (LSB)
1
2
3
4
5
6
7 (MSB)
Channel 0, bit 0 (ckt a, address 160, bit 0)
Channel 0, bit 1 (ckt a, address 160, bit 1)
Channel 1, bit 0 (ckt b, address 160, bit 0)
Channel 1, bit 1 (ckt b, address 160, bit 1)
Channel 2, bit 0 (ckt c, address 160, bit 0)
Channel 2, bit 1 (ckt c, address 160, bit 1)
Channel 3, bit 0 (ckt d, address 160, bit 0)
Channel 3, bit 1 (ckt d, address 160, bit 1)
0
1
7
0
1
7
CS
DCLK
DI
COMMAND
START
ADDRESS
LENGTH
DATA
0
1
7
0
1
7
0
1
7
0
1
7
0
1
7
COMMAND FRAME
D0
0
1
7
WAIT
≥
1.5
μ
s
*
*
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