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參數(shù)資料
| 型號： | ADSP-21267 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Preliminary Technical Data |
| 中文描述： | 初步技術(shù)數(shù)據(jù) |
| 文件頁數(shù)： | 16/44頁 |
| 文件大?。?/td> | 454K |
| 代理商： | ADSP-21267 |
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Rev. PrA
|
Page 16 of 44
|
January 2004
ADSP-21267
PRELIMINARY TECHNICAL DATA
Figure 5
shows Core to CLKIN ratios of 3:1, 8:1 and 16:1 with
external oscillator or crystal. Note that more ratios are possible
and can be set through software using the power management
control register (PMCTL). For more information, see the
ADSP-
2126x SHARC DSP Core Manual
.
Use the exact timing information given. Do not attempt to
derive parameters from the addition or subtraction of others.
While addition or subtraction would yield meaningful results
for an individual device, the values given in this data sheet
reflect statistical variations and worst cases. Consequently, it is
not meaningful to add parameters to derive longer times.
See
Figure 30 on page 36
under Test Conditions for voltage ref-
erence levels.
Switching Characteristics specify how the processor changes its
signals. Circuitry external to the processor must be designed for
compatibility with these signal characteristics. Switching char-
acteristics describe what the processor will do in a given
circumstance. Use switching characteristics to ensure that any
timing requirement of a device connected to the processor (such
as memory) is satisfied.
Timing Requirements apply to signals that are controlled by cir-
cuitry external to the processor, such as the data input for a read
operation. Timing requirements guarantee that the processor
operates correctly with other devices.
The ADSP-21267’s internal clock (a multiple of CLKIN) pro-
vides the clock signal for timing internal memory, processor
core, serial ports, and parallel port (as required for read/write
strobes in asynchronous access mode). During reset, program
the ratio between the DSP’s internal clock frequency and exter-
nal (CLKIN) clock frequency with the CLKCFG1-0 pins. To
determine switching frequencies for the serial ports, divide
down the internal clock, using the programmable divider con-
trol of each port (DIVx for the serial ports).
The ADSP-21267’s internal clock switches at higher frequencies
than the system input clock (CLKIN). To generate the internal
clock, the DSP uses an internal phase-locked loop (PLL). This
PLL-based clocking minimizes the skew between the system
clock (CLKIN) signal and the DSP’s internal clock (the clock
source for the parallel port logic and I/O pads).
Note the following definitions of various clock periods that are a
function of CLKIN and the appropriate ratio control.
Figure 5. Core Clock and System Clock Relationship to CLKIN
CLKIN
CCLK
(CORE CLOCK)
PLLILCLK
XTAL
XTAL
OSC
PLL
3:1, 8:1,
16:1
CLKOUT
CLK-CFG [1:0]
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ADSP-21267SKBCZ-X | Preliminary Technical Data |
| ADSP-21267SKSTZ-X | Preliminary Technical Data |
| ADSP-21362 | SHARC Processor |
| ADSP-21362BBC-1AA | SHARC Processor |
| ADSP-21362BBCZ-1AA | SHARC Processor |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADSP-21267SKBCZ-X | 制造商:AD 制造商全稱:Analog Devices 功能描述:Preliminary Technical Data |
| ADSP-21267SKSTZ-X | 制造商:AD 制造商全稱:Analog Devices 功能描述:Preliminary Technical Data |
| ADSP-21362 | 制造商:AD 制造商全稱:Analog Devices 功能描述:SHARC Processor |
| adsp-21362bbc-1aa | 制造商:Analog Devices 功能描述: |
| ADSP-21362BBCZ-1AA | 功能描述:數(shù)字信號處理器和控制器 - DSP, DSC 333 MHz Processor includes DTCP/SPDIF RoHS:否 制造商:Microchip Technology 核心:dsPIC 數(shù)據(jù)總線寬度:16 bit 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:2 KB 最大時鐘頻率:40 MHz 可編程輸入/輸出端數(shù)量:35 定時器數(shù)量:3 設(shè)備每秒兆指令數(shù):50 MIPs 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TQFP-44 安裝風(fēng)格:SMD/SMT |
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