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參數(shù)資料
| 型號： | ADSP-21990BBC |
| 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： | 16-BIT, 150 MHz, OTHER DSP, PBGA196 |
| 封裝： | MINI, BGA-196 |
| 文件頁數(shù)： | 5/44頁 |
| 文件大?。?/td> | 574K |
| 代理商： | ADSP-21990BBC |
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ADSP-21990
NOTE: The physical external memory addresses are limited by
20 address lines, and are determined by the external data width
and packing of the external memory space. The Strobe signals
(
MS3-0
) can be programmed to allow the user to change starting
page addresses at run time.
Internal (On-Chip) Memory
The ADSP-21990 unified program and data memory space
consists of 16M locations that are accessible through two 24-bit
address buses, the PMA and DMA buses. The DSP uses slightly
different mechanisms to generate a 24-bit address for each bus.
The DSP has three functions that support access to the full
memory map.
The DAGs generate 24-bit addresses for data fetches from
the entire DSP memory address range. Because DAG
index (address) registers are 16 bits wide and hold the
lower 16 bits of the address, each of the DAGs has its own
8-bit page register (DMPGx) to hold the most significant
eight address bits. Before a DAG generates an address,
the program must set the DAG DMPGx register to the
appropriate memory page. The DMPG1 register is also
used as a page register when accessing external memory.
The program must set DMPG1 accordingly, when
accessing data variables in external memory. A “C”
program macro is provided for setting this register.
The program sequencer generates the addresses for
instruction fetches. For relative addressing instructions,
the program sequencer bases addresses for relative jumps,
calls, and loops on the 24-bit Program Counter (PC). In
direct addressing instructions (two word instructions),
the instruction provides an immediate 24-bit address
value. The PC allows linear addressing of the full 24-bit
address range.
For indirect jumps and calls that use a 16-bit DAG
address register for part of the branch address, the
Program Sequencer relies on an 8-bit Indirect Jump page
(IJPG) register to supply the most significant eight
address bits. Before a cross page jump or call, the program
must set the program sequencer IJPG register to the
appropriate memory page.
The ADSP-21990 has 4K word of on-chip ROM that holds boot
routines. The DSP starts executing instructions from the on-chip
boot ROM, which starts the boot process.
See Booting Modes
on Page 13.
The on-chip boot ROM is located on Page 255 in
the DSP memory space map, starting at address 0xFF0000.
External (Off-Chip) Memory
Each of the ADSP-21990 off-chip memory spaces has a separate
control register, so applications can configure unique access
parameters for each space. The access parameters include read
and write wait counts, wait state completion mode, I/O clock
divide ratio, write hold time extension, strobe polarity, and data
bus width. The core clock and peripheral clock ratios influence
the external memory access strobe widths.
See Clock Signals on
Page 12.
The off-chip memory spaces are:
External memory space (
MS3–0
pins)
I/O memory space (
IOMS
pin)
Boot memory space (
BMS
pin)
All of the above off-chip memory spaces are accessible through
the External Port, which can be configured for 8-bit or 16-bit
data widths.
External Memory Space
External memory space consists of four memory banks. These
banks can contain a configurable number of 64 K word pages. At
reset, the page boundaries for external memory have Bank0 con-
taining pages 1 to 63, Bank1 containing pages 64 to 127, Bank2
containing pages 128 to 191, and Bank3 containing pages 192 to
254. The
MS3-0
memory bank pins select Banks 3-0, respec-
tively. Both the ADSP-219x core and DMA capable peripherals
can access the DSP external memory space.
All accesses to external memory are managed by the External
Memory Interface Unit (EMI).
I/O Memory Space
The ADSP-21990 supports an additional external memory
called I/O memory space. The IO space consists of 256 pages,
each containing 1024 addresses. This space is designed to
support simple connections to peripherals (such as data convert-
ers and external registers) or to bus interface ASIC data registers.
The first 32K addresses (IO pages 0 to 31) are reserved for
on-chip peripherals. The upper 224K addresses (IO pages 32 to
255) are available for external peripheral devices. External I/O
pages have their own select pin (
IOMS
). The DSP instruction
set provides instructions for accessing I/O space.
Figure 2. Core Memory Map at Reset
0x00 0000
0x00 0FFF
0x00 1000
0x00 7FFF
0x00 8000
0x00 8FFF
0x00 9000
0x01 0000
0x40 0000
0x80 0000
0xC0 0000
0xFF 0000
0xFF 1000
0xFF FFFF
0x00 FFFF
0xFF 0FFF
PAGE 0 (64K) ON-CHIP
(0 WAIT STATE)
EXTERNAL MEMORY
(4M – 64K)
PAGES 1 TO 63
BANK 0 (OFF-CHIP)
MS0
PAGE 255
(ON-CHIP)
EXTERNAL MEMORY
EXTERNAL MEMORY
PAGES 64 TO 127
BANK 1 (OFF-CHIP)
PAGES 128 TO 191
BANK 2 (OFF-CHIP)
PAGES 192 TO 254
BANK 0 (OFF-CHIP)
MS1
MS2
MS3
EXTERNAL MEMORY
(4M – 64K)
BLOCK 0: 4K
24-BIT RAM
RESERVED (28K)
RESERVED (28K)
BLOCK 1: 4K
16-BIT RAM
BLOCK 2: 4K
24-BIT
PM ROM
UNUSED ON-CHIP
MEMORY (60K)
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| ADSP-21991BST | 制造商:Analog Devices 功能描述:DSP Fixed-Point 16-Bit 160MHz 160MIPS 176-Pin LQFP 制造商:Rochester Electronics LLC 功能描述:HIGH PERFORMANCE MIXED SIGNAL DSP - Bulk |
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