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參數資料
| 型號： | W9330F |
| 廠商： | WINBOND ELECTRONICS CORP |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | Code Division Spread Spectrum Cordless Telephone Controller(具有編碼分劃和擴展頻普技術的無繩電話控制器) |
| 中文描述： | TELECOM, CORDLESS, SUPPORT CIRCUIT, PQFP100 |
| 封裝： | PLASTIC, QFP-100 |
| 文件頁數： | 8/26頁 |
| 文件大小： | 170K |
| 代理商： | W9330F |
Preliminary W9330F
- 8 -
PN sequence
select
PN sequence
comparator
Transmit symbol
Receive symbol
programmable
PN sequence
speader
de-speader
transmit signal
receive signal
(to RF)
(fromRF)
2. Time Division Duplex
The W9330F emulates full duplex communication on a half duplex link by using time division duplex
(TDD). The two communication units, one designated as master and the other designated as slave,
communicate with each other by using the TDD protocol.
Within each time slot, only one device is transmitting and the other is in either idle or receiving mode.
Three types of communication frames are used by the master and slave to establish communication
link and transmit data. The frame structures are illustrated in the following diagram.
Each frame consists of 324 bits. It includes a 54-bit preamble and five sub-frames. Each sub-frame
contains 48 bits of data and 6 bits of parity. The first subframe contains 24 bits of ID field which
uniquely identifies the master-slave pair. Between transmitting and receiving of each frame, idle time
equals to the transmission time of 60 bits is added for RF module switching and locking. At the chip
rate of 1.365333 MHz and spread of 10.667, the transmission time of one frame including the idle
time is exactly 3.000 mS. With 192 bits of user data transmitted per frame, the data bandwidth is 32
Kbps in each direction.
Communication is initiated by the master by sending the acquisition frame. When the slave acquires
the acquisition frame and correctly matches the ID field, it responds by sending another acquisition
frame to the master.
When the master receives the acquisition frame with the correct ID, it responds by sending the empty
frame to the slave. The slave responds by sending another empty frame and the communication link
is established.
Once the link is established, the master and the slave take turns in sending data frame. Each data
frame contains the ID and status sub-frame to identify the intended receiver and the command/status
information in addition to user data.
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