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| 型號(hào)： | AT75C1010 |
| 英文描述： | AT75C1010 Telephony Software Module [Updated 11/01. 29 Pages] This software module runs on the OakDSPCore subsystem of the AT75 series SIAP. expanding its capabilities and making the processor flexible and east to integrate into most operating systems. |
| 中文描述： | AT75C1010電話軟件模塊[更新11/01。 29頁(yè)]本軟件模塊上運(yùn)行的AT75系列OakDSPCore子系統(tǒng)統(tǒng)計(jì)所。擴(kuò)大其能力，使處理器的靈活和東部地區(qū)融入大多數(shù)操作系統(tǒng)。 |
| 文件頁(yè)數(shù)： | 65/171頁(yè) |
| 文件大?。?/td> | 1288K |
| 代理商： | AT75C1010 |
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157
AT75C DSP Subsystem
1368C–INTAP–08/02
Codec Interface
Registers
The codec interface operates through a set of memory-mapped registers. These regis-
ters are listed below. The first three are control registers, which impact the behavior of
the interface. They are described in more detail in “Codec Control Register”. These are
followed by a status register, which informs the software about the current status of the
interface. The status register is described in more detail in “Codec Interface Status Infor-
mation” on page 161. The two final registers hold the data sent/received to/from the
codec device.
During normal codec interface operation, the CODTX is typically loaded with data to be
transmitted on the codec interface by the executing program, and its contents read auto-
matically by the codec interface logic to be sent out when a transmission is initiated. The
CODRX is loaded automatically by the codec interface logic with data received on the
codec interface and read by the executing program to retrieve the received data.
Codec Interface Signals
Only four wires are needed to achieve synchronous bi-directional communications
between the codec interface and an external codec. Those wires are described in Table
The SCLK signal is the serial clock. All the other codec interface signals are synchro-
nous to this clock. In particular, the SCLK is used as the shift clock for the codec
interface transmit and receive shift registers. The SCLK signal can be delivered either
by the external codec device (master mode) or by the AT75C itself (slave mode).
The FS signal is used to indicate the beginning of a transmission between the AT75C
and the external codec device. Typically, the state of FS changes when the first bit of
transmitted word is delivered on the SDIN/SDOUT lines. When the AT75C is connected
to an external stereo codec, the FS signal can also be used to discriminate the right
channel against the left channel. The FS signal is synchronous to SCLK. In master
mode, it is sampled by the AT75C. In slave mode, it is generated by the AT75C.
SDIN is used to carry the serial bits from the external codec device into the AT75C
codec interface. The value on SDIN is sampled by the AT75C each SCLK period.
Table 12. Codec Interface Registers
Address
Register Name
Description
Access
Reset Value
0xEC00
CODCNT
Codec control register
R/W
0x0800
0xEC02
CODFRM
Codec frame control register
R/W
0x0096
0xEC04
CODSCK
Codec serial clock control register
R/W
0x401F
0xEC06
CODSTS
Codec status register
R
0x0000
0xEC08
CODTX
Codec transmit data register
W
0x0000
0xEC0A
CODRX
Codec receive data register
R
0x0000
Table 13. Codec Interface Wires Description
Signal Name
Direction
Description
SCLK
I/O
Serial clock
FS
I/O
Frame synchronization
SDIN
I
Serial Data In
SDOUT
O
Serial Data Out
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