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參數資料
| 型號： | AL3201 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 元件分類： | 圓形連接器 |
| 英文描述： | Circular Connector; No. of Contacts:19; Series:D38999; Body Material:Metal; Connecting Termination:Crimp; Connector Shell Size:15; Circular Contact Gender:Socket; Circular Shell Style:Straight Plug; Insert Arrangement:15-19 |
| 中文描述： | 可控硅，或單芯片混響 |
| 文件頁數： | 5/10頁 |
| 文件大?。?/td> | 256K |
| 代理商： | AL3201 |
Alesis Semiconductor
DS3201-0802 12555 J efferson Blvd., Suite 285
Los Angeles, CA 90066
Phone (310) 301-0780 Fax (310) 306-1551 www.alesis-semi.com
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5
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Programming the RAM
Alongside the 16 internal programs is an
externally programmable SRAM that is
easily accessible through the serial clock
and data pins. By setting the chip to
external mode, the SClk and SData pins
become
available
communication. E xcept for its external
programmability, there is no functional
difference between the SRAM and the
internal ROMs.
Memory Map
Addr
for
serial
Name
Addr
0:3
4:127
Name
LFO Coefficients
MAC Instructions
0:127
WCS RAM
128
129
Control/ Status 0
Control/ Status 1
A simple assembly language is available
for writing programs. With the assembler
and loader software available from the
Alesis Semiconductor website, programs
may
be
developed
downloaded into the chip. Please refer to
the assembly language guide for a full
description.
LFO Coefficient Word
Bit #
Description
31
P: Pitch shift mode select (S must be set).
1
30
S: Sine/ triangle select. 1:Triangle; 0: Sine.
X[1:0]: Crossfade
coefficient select. Value
indicates the fraction of a
half sawtooth period
used in crossfading.
27:15
F[12:0]: Frequency coefficient, unsigned.
14:0
A[14:0]: Amplitude coefficient, unsigned.
Note:
If set, the output waveform is a sawtooth with double
the triangle wave’s frequency.
Sawtooth SIN
Sawtooth COS
Crossfade 1
Crossfade 1/ 2
Crossfade 1/ 8
on
the
PC
and
X [1:0]
11
10
01
00
X fade
1/ 16
1/ 8
1/ 2
1
29:28
The first four instructions in the WCS RAM
set the parameters for the four LFOs. The
sinusoid generated by the LFOs is of the
formula Asin(nF/ M) or Acos(nF/ M), where
n is the time index, F/ M = 2
π
f/ F
S
, M is the
maximum internal value, f is the selected
frequency, and F
S
is the sampling
frequency. Thus the frequency extrema
are:
f
= (F/ M) F
S
/ (2
π
)
f
min
= (0x1/ 0x3ffff) (48kHz)/ (2
π
)
= 0.029Hz
f
max
= (0x1fff/ 0x3ffff) (48kHz)/ (2
π
)
= 239Hz
Triangle waves are generated by incremen-
tally adding or subtracting 0x400000*F/ M
(= 2
22
*F/ M) from the maximum internal
negative or positive value respectively. Its
frequency extrema are then:
f
= # Samples / # Steps
= F
S
/ (4 Max/ Increment)
= F
S
/ (4 0x7fffff/ (2
22
*F/ M))
f
min
= 48kHz / (8/ (0x1/ 0x3ffff))
= 0.023Hz
f
max
= 48kHz / (8/ (0x1fff/ 0x3ffff))
= 187Hz
When
chorus
instructions
addresses are offset by the output an LFO.
The range of this offset is plus and minus
A/ 8 samples, or A/ 4 samples total.
Following the 4 LFO coefficient words are
124 MAC instruction words. These
instructions allow the manipulation of the
DRAM and the waveforms generated by
the LFOs.
A good NOP instruction is 0x00030000.
This instruction preserves the value in all
registers, and is the NOP executed in the
MAC during the first four ticks of every
sample period while the LFO coefficients
are loaded.
By judiciously choosing the LFO frequency
and waveform with which to sweep
through the DRAM, it is possible to
generate pitch shifts, flanges, choruses,
reverbs, and other effects. Please see
application notes for descriptions and
examples.
are
used,
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