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參數資料
| 型號： | W9310 |
| 廠商： | WINBOND ELECTRONICS CORP |
| 元件分類： | 通信及網絡 |
| 英文描述： | Direct Sequence Spread Spectrum Transceiver(直接序列擴展頻譜收發器) |
| 中文描述： | SPECIALTY TELECOM CIRCUIT, PQFP80 |
| 封裝： | PLASTIC, QFP-80 |
| 文件頁數： | 13/36頁 |
| 文件大小： | 220K |
| 代理商： | W9310 |
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W9310
Publication Release Date: July 1996
- 13 -
Revision A3
When communication between two devices first commences, the microprocessors program one of
the devices as the master and the other device as the slave. The master device transmits periodic
bursts as soon as the reset signal, RST2_N, is released. The burst timing of the master is derived
from its internal master clock oscillator and can be computed from Eq. (1) below
f
192
In Eq. (1), f
burst
is the burst rate and f
mosc
is the master oscillator frequency. For a voice device using
the 32 Kbps ADPCM codec, the required master oscillator frequency is 16.384 MHz with a burst rate
of 85.333 Kbps or a burst period of 11.719
μ
sec. Note that this burst rate is the actual bit rate at which
the W9310 is transmitting during TDD operation, and 2.667 times the user bit rate (32 Kbps). As the
transmitter uses a quadrature modulation scheme, the chip rate is 16 times the burst rate or
f
12
where f
chip
is the chip rate and f
mosc
is the master oscillator frequency. The spread spectrum
transceiver operates at 16 chips/bit or 32 chips/symbol, where each symbol is composed of 2 bits.
The total number of bits per burst is fixed and equal for the master and the slave. The slave derives
its burst timing from the master by detecting the UW pulse transmitted by the master.
f
burst
mosc
=
(1)
f
16
chip
mosc
=
=
×
f
burst
(2)
TDD (Ping-pong) Protocol
Initially, the two communicating devices need to establish "sync." The TDD protocol achieves this by
using a special handshaking protocol. The master first transmits an acquisition burst containing 32
bits of preamble (binary 0's), followed by 226 bits of zeros stuffing and four 22-bit unique words (UW).
When the slave receives the acquisition burst from the master correctly (by decoding the 4
consecutive UWs), it sends an acquisition burst in response. When the master receives the
acquisition burst, it sends an "empty burst." An empty burst contains a 32-bit preamble followed by a
single 22-bit unique word and 292 bits of "1" (one stuffing). In response to the master's empty burst,
the slave also sends an empty burst back to the master. When the master receives the empty burst
from the slave, the communication link is considered to have been established and the "sync"
condition achieved. On the following burst, both the master and the slave start genuine data
transmission by sending out data bursts. Each of the data bursts contains a 32-bit preamble, followed
by a 22-bit UW, a 4-bit status nibble (ST), and 288 bits of user data (be it ADPCM voice samples or
data). The three different types of burst frame structures are shown in Figure 1.
Preamble
Zero Stuffing
Acquisition Burst Frame Structure
UW
UW
UW
UW
Preamble
UW
One Stuffing
Empty Burst Frame Structure
Preamble
UW
ST
Data
Data Burst Frame Structure
FIELD
BITS
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