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參數(shù)資料
| 型號： | T8538A |
| 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)： | 16/42頁 |
| 文件大小： | 1019K |
| 代理商： | T8538A |
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16
Lucent Technologies Inc.
Advance Data Sheet
October 2000
T8538A 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 12—14 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 12. 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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