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參數(shù)資料
| 型號： | ADSP-2187NBCA-320 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 47/48頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC DSP 16BIT 80MHZ 144CSPBGA |
| 標準包裝： | 1 |
| 系列： | ADSP-21xx |
| 類型： | 定點 |
| 接口： | 主機接口，串行端口 |
| 時鐘速率： | 80MHz |
| 非易失內存： | 外部 |
| 芯片上RAM： | 160kB |
| 電壓 - 輸入/輸出： | 1.8V，2.5V，3.3V |
| 電壓 - 核心： | 1.90V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 144-LFBGA，CSPBGA |
| 供應商設備封裝： | 144-CSBGA（10x10） |
| 包裝： | 托盤 |
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Rev. A
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Page 8 of 48
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August 2006
ADSP-218xN
Clock Signals
ADSP-218xN series members can be clocked by either a crystal
or a TTL-compatible clock signal.
The CLKIN input cannot be halted, changed during operation,
nor operated below the specified frequency during normal oper-
ation. The only exception is while the processor is in the power-
down state. For additional information, refer to the ADSP-218x
DSP Hardware Reference, for detailed information on this
power-down feature.
If an external clock is used, it should be a TTL-compatible signal
running at half the instruction rate. The signal is connected to
the processor’s CLKIN input. When an external clock is used,
the XTAL pin must be left unconnected.
ADSP-218xN series members use an input clock with a fre-
quency equal to half the instruction rate; a 40 MHz input clock
yields a 12.5 ns processor cycle (which is equivalent to
80 MHz). Normally, instructions are executed in a single pro-
cessor cycle. All device timing is relative to the internal instruc-
tion clock rate, which is indicated by the CLKOUT signal
when enabled.
Because ADSP-218xN series members include an on-chip oscil-
lator circuit, an external crystal may be used. The crystal should
be connected across the CLKIN and XTAL pins, with two
capacitors connected as shown in Figure 3. Capacitor values are
dependent on crystal type and should be specified by the crystal
manufacturer. A parallel-resonant, fundamental frequency,
microprocessor-grade crystal should be used. To provide an
adequate feedback path around the internal amplifier circuit,
place a resistor in parallel with the circuit, as shown in Figure 3.
A clock output (CLKOUT) signal is generated by the processor
at the processor’s cycle rate. This can be enabled and disabled by
the CLKODIS bit in the SPORT0 Autobuffer Control Register.
RESET
The RESET signal initiates a master reset of the ADSP-218xN.
The RESET signal must be asserted during the power-up
sequence to assure proper initialization. RESET during initial
power-up must be held long enough to allow the internal clock
to stabilize. If RESET is activated any time after power-up, the
clock continues to run and does not require stabilization time.
The power-up sequence is defined as the total time required for
the crystal oscillator circuit to stabilize after a valid VDD is
applied to the processor, and for the internal phase-locked loop
(PLL) to lock onto the specific crystal frequency. A minimum of
2000 CLKIN cycles ensures that the PLL has locked, but does
not include the crystal oscillator start-up time. During this
power-up sequence the RESET signal should be held low. On
any subsequent resets, the RESET signal must meet the mini-
mum pulse-width specification (tRSP).
The RESET input contains some hysteresis; however, if an RC
circuit is used to generate the RESET signal, the use of an exter-
nal Schmitt trigger is recommended.
The master reset sets all internal stack pointers to the empty
stack condition, masks all interrupts, and clears the MSTAT
register. When RESET is released, if there is no pending bus
request and the chip is configured for booting, the boot-loading
sequence is performed. The first instruction is fetched from on-
chip program memory location 0x0000 once boot loading
completes.
POWER SUPPLIES
ADSP-218xN series members have separate power supply con-
nections for the internal (VDDINT) and external (VDDEXT) power
supplies. The internal supply must meet the 1.8 V requirement.
The external supply can be connected to a 1.8 V, 2.5 V, or 3.3 V
supply. All external supply pins must be connected to the same
supply. All input and I/O pins can tolerate input voltages up to
3.6 V, regardless of the external supply voltage. This feature pro-
vides maximum flexibility in mixing 1.8 V, 2.5 V, or 3.3 V
components.
Figure 3. External Crystal Connections
CL KIN
CL KO UT
XT A L
DS P
1M
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相關代理商/技術參數(shù) |
參數(shù)描述 |
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| ADSP-2187NBST-320 | 制造商:Analog Devices 功能描述:DSP Fixed-Point 16-Bit 80MHz 80MIPS 100-Pin LQFP 制造商:Analog Devices 功能描述:IC MICROCOMPUTER 16-BIT |
| ADSP-2187NBSTZ-320 | 功能描述:IC DSP CONTROLLER 16BIT 100LQFP RoHS:是 類別:集成電路 (IC) >> 嵌入式 - DSP（數(shù)字式信號處理器） 系列:ADSP-21xx 標準包裝:40 系列:TMS320DM64x, DaVinci™ 類型:定點 接口:I²C，McASP，McBSP 時鐘速率:400MHz 非易失內存:外部 芯片上RAM:160kB 電壓 - 輸入/輸出:3.30V 電壓 - 核心:1.20V 工作溫度:0°C ~ 90°C 安裝類型:表面貼裝 封裝/外殼:548-BBGA，F(xiàn)CBGA 供應商設備封裝:548-FCBGA（27x27） 包裝:托盤 配用:TMDSDMK642-0E-ND - DEVELPER KIT W/NTSC CAMERA296-23038-ND - DSP STARTER KIT FOR TMS320C6416296-23059-ND - FLASHBURN PORTING KIT296-23058-ND - EVAL MODULE FOR DM642TMDSDMK642-ND - DEVELOPER KIT W/NTSC CAMERA |
| ADSP-2187NBSTZ-3202 | 制造商:AD 制造商全稱:Analog Devices 功能描述:DSP Microcomputer |
| ADSP-2187NKCA-320 | 制造商:Analog Devices 功能描述:DSP Fixed-Point 16-Bit 80MHz 80MIPS 144-Pin CSP-BGA 制造商:Rochester Electronics LLC 功能描述:32K PM/32K DM RAM,16-BIT,80 MIPS, 1.8V - Bulk |
| ADSP-2187NKST-320 | 制造商:Rochester Electronics LLC 功能描述:32K PM/32K DM RAM,16-BIT, 80 MIPS, 1.8V - Bulk 制造商:Analog Devices 功能描述:IC MICROCOMPUTER 16-BIT |
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