參數(shù)資料
型號(hào)： Z87200
廠商： ZILOG INC
元件分類： 通信及網(wǎng)絡(luò)
英文描述： CAP 0.047UF 100V 10% X7R AXIAL TR-14
中文描述： SPECIALTY TELECOM CIRCUIT, PQFP100
封裝： PLASTIC, QFP-100
文件頁(yè)數(shù)： 40/54頁(yè)
文件大?。?/td> 449K
代理商： Z87200
Z87200
Spread-Spectrum Transceiver
Zilog
4-40
DS96WRL0400
CONTROL REGISTERS
(Continued)
Address 4C
H
through 53
H
:
Data Symbol Code
Addresses 4C
H
to 53
H
contain the binary Data Symbol PN
code sequence values. The storage capacity, assign-
ments, and operation are similar to that of the Acquisi-
tion/Preamble PN code sequence values. The configura-
tion of the bits stored is as shown in Table 22.
Transmit Control Registers
Address 54
H
:
Bits 1-0 — Transmitter Overlay Select
The Z87200 incorporates programmable overlay code
generators in both the transmitter and receiver. When en-
abled, the selected transmitter overlay code is subtracted
from the data symbols, one overlay bit per symbol in both
BPSK and QPSK modes. No synchronization is required
since the codes in both the transmitter and the receiver are
automatically synchronized by resetting the code genera-
tors at the start of each burst. The addition of the overlay
codes randomizes the transmitted data sequence to guar-
antee that the spectrum of the transmitted signal will be ad-
equately whitened and will not contain a small number of
spectral lines even when the data itself is not random.
Three transmit and receive overlay codes can be selected,
where they are each maximal length sequences with
lengths of 63, 511 and 1023 symbols. The transmitter
overlay codes are enabled and selected by the settings of
bits 1-0 of address 54
H
, as shown in Table 23.
Bit 2 —Transmitter Symbols Per Burst Off
Bit 2 of address 54
H
is not used and must always be set
low (0).
Address 55
H
through 56
H
:
Transmitter Data Symbols per Burst (bits 15-0)
The data stored as two bytes in addresses 55
H
(LS byte)
and 56
H
(MS byte) defines the number of data symbols per
burst for the transmitter. This unsigned value must range
from 1 to 65,535 (0001
H
to FFFF
H
), and the number of
data symbols per burst will be this value plus 1. Note that
the range is slightly different from that in the receiver. Once
the number of transmitted data symbols exceeds this num-
ber, the burst is assumed to have ended and the transmit-
ter is immediately turned off. If the data value is set to
0000
H
, then the symbols per burst counter is disabled, per-
mitting the Z87200 to be used for continuous transmission
of data.
Table 22. Data Symbol Codes
Addr 53
H
, Bits 7-0
Code Bits 63-56
Addr 4D
H
, Bits 7-0
Code Bits 15-8
Addr 4C
H
, Bits 7-0
Code Bits 7-0
Table 23. Transmitter Overlay Code Select
Bits 1-0 in
Addr. 54
H
0
1
2
3
Overlay Code Length
and Polynomial
Overlay Code Disabled
63: 1+x
-2
+x
-3
+x
-5
+x
-6
511: 1+x
-2
+x
-3
+x
-5
+x
-9
1023: 1+x
-2
+x
-3
+x
-5
+x
-10
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