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參數(shù)資料
| 型號： | ADSP-21990 |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | 數(shù)字信號處理 |
| 英文描述： | 16-bit fixed point DSP with Flash |
| 中文描述： | 具有閃存的 16 位定點 DSP |
| 文件頁數(shù)： | 6/44頁 |
| 文件大?。?/td> | 574K |
| 代理商： | ADSP-21990 |
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ADSP-21990
–6–
REV. 0
Boot Memory Space
Boot memory space consists of one off-chip bank with 254 pages.
The
BMS
memory bank pin selects boot memory space. Both
the ADSP-219x core and DMA capable peripherals can access
the DSP off-chip boot memory space. After reset, the DSP always
starts executing instructions from the on-chip boot ROM.
Bus Request and Bus Grant
The ADSP-21990 can relinquish control of the data and address
buses to an external device. When the external device requires
access to the bus, it asserts the bus request (
BR
) signal. The (
BR
)
signal is arbitrated with core and peripheral requests. External
Bus requests have the lowest priority. If no other internal request
is pending, the external bus request will be granted. Due to syn-
chronizer and arbitration delays, bus grants will be provided with
a minimum of three peripheral clock delays. The ADSP-21990
will respond to the bus grant by:
Three-stating the data and address buses and the
MS3–0
,
BMS
,
IOMS
,
RD
, and
WR
output drivers.
Asserting the bus grant (
BG
) signal.
The ADSP-21990 will halt program execution if the bus is
granted to an external device and an instruction fetch or data
read/write request is made to external general-purpose or periph-
eral memory spaces. If an instruction requires two external
memory read accesses, the bus will not be granted between the
two accesses. If an instruction requires an external memory read
and an external memory write access, the bus may be granted
between the two accesses. The external memory interface can be
configured so that the core will have exclusive use of the interface.
DMA and Bus Requests will be granted. When the external
device releases
BR
, the DSP releases
BG
and continues program
execution from the point at which it stopped.
The bus request feature operates at all times, even while the DSP
is booting and
RESET
is active.
The ADSP-21990 asserts the
BGH
pin when it is ready to start
another external port access, but is held off because the bus was
previously granted. This mechanism can be extended to define
more complex arbitration protocols for implementing more
elaborate multimaster systems.
DMA Controller
The ADSP-21990 has a DMA controller that supports
automated data transfers with minimal overhead for the DSP
core. Cycle stealing DMA transfers can occur between the
ADSP-21990 internal memory and any of its DMA capable
peripherals. Additionally, DMA transfers can be accomplished
between any of the DMA capable peripherals and external
devices connected to the external memory interface. DMA
capable peripherals include the SPORT and SPI ports, and ADC
Control module. Each individual DMA capable peripheral has a
dedicated DMA channel. To describe each DMA sequence, the
DMA controller uses a set of parameters—called a DMA descrip-
tor. When successive DMA sequences are needed, these DMA
descriptors can be linked or chained together, so the completion
of one DMA sequence auto initiates and starts the next sequence.
DMA sequences do not contend for bus access with the DSP
core, instead DMAs “steal” cycles to access memory.
All DMA transfers use the DMA bus shown in
Figure 1 on
Page 4
. Because all of the peripherals use the same bus, arbitra-
tion for DMA bus access is needed. The arbitration for DMA bus
access appears in
Table 1
.
DSP Peripherals Architecture
The ADSP-21990 contains a number of special purpose,
embedded control peripherals, which can be seen in the Func-
tional Block Diagram on Page 1. The ADSP-21990 contains a
high performance, 8-channel, 14-bit ADC system with dual
channel simultaneous sampling ability across four pairs of inputs.
An internal precision voltage reference is also available as part of
the ADC system. In addition, a 3-phase, 16-bit, center based
PWM generation unit can be used to produce high accuracy
PWM signals with minimal processor overhead.
The ADSP-21990 also contains a flexible incremental encoder
interface unit for position sensor feedback; two adjustable
frequency auxiliary PWM outputs, 16 lines of digital I/O; a
16-bit watchdog timer; three general-purpose timers, and an
interrupt controller that manages all peripheral interrupts.
Figure 3. I/O Memory Map
Figure 4. Boot Memory Map
ON-CHIP
PERIPHERALS
16-BITS
OFF-CHIP
PERIPHERALS
16-BITS
PAGES 0 TO 31
1024 WORDS/PAGE
2 PERIPHERALS/PAGE
0x00::0x000
0x20::0x000
0xFF::0x3FF
0x1F::0x3FF
PAGES 32 TO 255
1024 WORDS/PAGE
PAGES 1 TO 254
64K WORDS/PAGE
0x01 0000
0xFE 0000
OFF-CHIP
BOOT MEMORY
16-BITS
Table 1. I/O Bus Arbitration Priority
DMA Bus Master
Arbitration Priority
SPORT Receive DMA
SPORT Transmit DMA
ADC Control DMA
SPI Receive/Transmit DMA
Memory DMA
0—Highest
1
2
3
4—Lowest
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ADSP-21990BBC | 16-bit fixed point DSP with Flash |
| ADSP-21990BST | 16-bit fixed point DSP with Flash |
| ADSP-21MOD870-100 | Single Chip Digital Modem(單片數(shù)字調(diào)制解調(diào)器) |
| ADSP-21MOD870-110 | Internet Gateway Processor Software |
| ADSP-21MOD870 | Internet Gateway Processor |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADSP-21990BBC | 制造商:Analog Devices 功能描述:DSP Fixed-Point 16-Bit 150MHz 150MIPS 196-Pin Mini-BGA 制造商:Rochester Electronics LLC 功能描述:160 MIPS, MIXED SIGNAL DSPWITH 14-BIT - Bulk |
| ADSP-21990BST | 制造商:Rochester Electronics LLC 功能描述:160 MIPS,MIXED SIGNAL DSP WITH 14BIT - Tape and Reel |
| ADSP-21990BSTZ | 功能描述:IC DSP CONTROLLER 16BIT 176-LQFP 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(biāo)準(zhǔn)包裝:2 系列:StarCore 類型:SC140 內(nèi)核 接口:DSI，以太網(wǎng)，RS-232 時鐘速率:400MHz 非易失內(nèi)存:外部 芯片上RAM:1.436MB 電壓 - 輸入/輸出:3.30V 電壓 - 核心:1.20V 工作溫度:-40°C ~ 105°C 安裝類型:表面貼裝 封裝/外殼:431-BFBGA，F(xiàn)CBGA 供應(yīng)商設(shè)備封裝:431-FCPBGA（20x20） 包裝:托盤 |
| ADSP-21991BBC | 制造商:Analog Devices 功能描述:DSP Fixed-Point 16-Bit 150MHz 150MIPS 196-Pin Mini-BGA |
| ADSP-21991BBCZ | 功能描述:IC DSP CTLR 16BIT 196CSPBGA 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(biāo)準(zhǔn)包裝:2 系列:StarCore 類型:SC140 內(nèi)核 接口:DSI，以太網(wǎng)，RS-232 時鐘速率:400MHz 非易失內(nèi)存:外部 芯片上RAM:1.436MB 電壓 - 輸入/輸出:3.30V 電壓 - 核心:1.20V 工作溫度:-40°C ~ 105°C 安裝類型:表面貼裝 封裝/外殼:431-BFBGA，F(xiàn)CBGA 供應(yīng)商設(shè)備封裝:431-FCPBGA（20x20） 包裝:托盤 |
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