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| 型號： | MPC823 |
| 廠商： | Motorola, Inc. |
| 英文描述： | Communication Processor Module |
| 中文描述： | 通信處理器模塊 |
| 文件頁數(shù)： | 28/74頁 |
| 文件大小： | 234K |
| 代理商： | MPC823 |
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Communication Processor Module
16-406
MPC823 REFERENCE MANUAL
MOTOROLA
S
C
1
P
16.11.7 The SMCx in Transparent Mode
A serial managment controller in Transparent mode is also referred to as the SMCx
Transparent controller. The following is a list of the features that the SMCx Transparent
controller does
not
support:
Independent transmit and receive clocks, unless it is connected to the TDM channel of
the serial interface
CRC generation and checking
Full RTSx, CTSx, and CDx pins. Instead, there is a SMSYN pin for each SMC.
Ability to transmit data on demand using the transmit on demand register
Receiver/transmitter in transparent mode while executing another protocol
4-, 8-, or 16-bit Sync recognition
Internal DPLL support
An SMCx in Transparent mode has one feature that an SCCx in Transparent mode does
not. The serial management controllers allow a data character length option of 4 to 16 bits,
whereas the SCCs allow 8 or 32 bits, depending on how the RFW bit is set in the GSMR_H
(described in
Section 16.9.2 The General SCCx Mode Registers
).
16.11.7.1 FEATURES.
The following list summarizes the features of a serial management
controller in Transparent mode:
Flexible data buffers
Connects to the TDM bus using the time-slot assigner in the serial interface
Transmits and receives transparently on its own set of pins using a sync pin to
synchronize the beginning of transmission and reception to an external event
Programmable 4-16 character length
Reverse data mode
Continuous transmission and reception modes
Four available commands
16.11.7.2 SMCx TRANSPARENT CHANNEL TRANSMISSION PROCESS.
The SMCx
Transparent transmitter is designed to work with almost no intervention from the core. When
the core enables the SMCx transmitter in transparent mode, it starts transmitting idles. The
serial management controllers immediately poll the first buffer descriptor in the transmit
channel buffer descriptor ring once every character time, depending on the character length
(every 4 to 16 serial clocks). When there is a message to transmit, a serial management
controller fetches the data from memory and starts transmitting the message after
synchronization is achieved.
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