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參數(shù)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(kuò)展頻普技術(shù)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(shù)： | 7/26頁 |
| 文件大小： | 170K |
| 代理商： | W9330F |
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Preliminary W9330F
Publication Release Date: August 1998
- 7 -
Revision A1
Table 4: System Interface, continued
PARAMETER
PIN
TYPE
DESCRIPTIONS
PD[7:0]
78, 77,
53, 50,
49, 43,
42, 41
IO
General purpose I/O port
RESET
47
IN
System reset. This is asynchronous reset signal. RESET must
be asserted for at least ten clock cycles after initial power up.
RLOCK
86
OUT
Remote Lock. Indicates that W9330F is in the RLOCK state.
see functional description section for more detail
WAKEUP
99
OUT
Combinational output of port C input pins.
WAKEUP = PC0| PC1|PC2|PC3|~PC4|~PC5|~PC6|~PC7
FUNCTIONAL DESCRIPTION
The W9330F is an integrated baseband chip designed for digital cordless telephone applications. It
employs direct sequence spread spectrum technology for secure and superior voice data
transmission. All the telephone controller functions are provided including: time division duplex
control, pseudo noise spreader and de-spreader, direct codec interface and I/O expansion ports.
1. Spreader and De-spreader
The function of the spreader is the key to any spread spectrum communication system. It encodes
(spreads) the voice data into a multiple bit (chip) pseudo-noise (PN) sequence for transmission.
Four sets of PN sequences, 32 chips each, are programmable by the system controller. The four PN
sequences and their opposite phase counterparts form eight possible PN combinations. Every three
bits of the transmit data is grouped together to form a symbol. Each one of the eight possible symbol
is assigned to one of the PN combination. With each PN sequence being 32-chip long and each
symbol carries 3 bits of user data, the spread ratio is 10.667.
The de-spreader performs the reversed function of the spreader. The received signal (chip) is
sampled by the de-spreader and compared with the eight possible PN sequence being sent. The user
data is recovered based on the best-matched PN sequence.
The received signal is sampled by the de-spreader at twice the chip rate. This sampling rate is chosen
to ensure that the transmitted signal can be sufficiently reconstructed after all the environmental
distortion.
The following diagram shows the principal functions of the spreader and the de-spreader.
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