參數(shù)資料
型號(hào)： T8538B
元件分類(lèi)： 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)： 17/44頁(yè)
文件大小： 847K
代理商： T8538B
Agere Systems Inc.
17
Preliminary Data Sheet
August 2001
T8538B Quad Programmable Codec
Functional Description
(continued)
The Control Interface
(continued)
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 5. Bit Assignments for Fast Scan Mode
The circuit select in the command structure (Figure 4) is not used for this special single-byte command. The rules
for toggling chip select apply as for the read command. Figures 14—17 illustrate normal or byte-by-byte operation
with continuous or gapped DCLKs.
0125B
* Provides sufficient wait time to access read data.
Allow a minimum of 244 ns between bytes.
Figure 14. Fast Scan, Normal Mode (Continuous DCLK)
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)
1
2
3
CS
DCLK
DI
COMMAND
DATA
4
5
DO
WAIT
≥
1.5
μ
s
*
0
1
2
3
4
5
6
7
6
7
0
1
2
3
4
5
6
7
0
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