參數(shù)資料
型號: AT91SAM9N12-CU
廠商: Atmel
文件頁數(shù): 11/27頁
文件大小: 0K
描述: IC MCU ARM9 217-LFBGA
標(biāo)準(zhǔn)包裝: 126
系列: SAM9N
核心處理器: ARM9
芯體尺寸: 16/32-位
速度: 400MHz
連通性: EBI/EMI,I²C,MMC,SPI,SSC,UART/USART,USB
外圍設(shè)備: DMA,LCD,POR,PWM,WDT
輸入/輸出數(shù): 105
程序存儲器容量: 128KB(128K x 8)
程序存儲器類型: ROM
RAM 容量: 32K x 8
電壓 - 電源 (Vcc/Vdd): 0.9 V ~ 1.1 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 12x10b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: *
包裝: *
19
11096AS–ATARM–4-Oct-11
SAM9N12
6.3
External Memories Overview
The SAM9N12 features a External Bus Interface to offer interface to a wide range of external
memories and to any parallel peripheral.
6.3.1
External Bus Interface
Integrates three External Memory Controllers:
– Static Memory Controller
– DDR2/SDRAM Controller
– MLC NAND Flash ECC Controller
Up to 26-bit Address Bus (up to 64MBytes linear per chip select)
Up to 6 chips selects, Configurable Assignment:
– Static Memory Controller on NCS0, NCS1, NCS2, NCS3, NCS4, NCS5
– DDR2/SDRAM Controller (SDCS) or Static Memory Controller on NCS1
– NAND Flash support on NCS3
6.3.2
Static Memory Controller
8- or 16-bit Data Bus
Multiple Access Modes supported
– Byte Write or Byte Select Lines
– Asynchronous read in Page Mode supported (4- up to 16-byte page size)
Multiple device adaptability
– Control signals programmable setup, pulse and hold time for each Memory Bank
Multiple Wait State Management
– Programmable Wait State Generation
– External Wait Request
– Programmable Data Float Time
Slow Clock mode supported
6.3.3
DDR-SDRAM Controller
Supports DDR2-SDRAM, Low-power DDR1-SDRAM or DDR2-SDRAM, SDR-SDRAM and
Low-power SDR-SDRAM
Numerous Configurations Supported
– 2K, 4K, 8K, 16K Row Address Memory Parts
– SDRAM with 4 Internal Banks
– SDR-SDRAM with 16-bit or 32-bit Data Path
– DDR-SDRAM with 16-bit Data Path
– One Chip Select for SDRAM Device (256 Mbytes Address Space)
Programming Facilities
– Multibank Ping-pong Access (Up to 4 Banks or 8 Banks Opened at Same Time =
Reduced Average Latency of Transactions)
– Timing Parameters Specified by Software
– Automatic Refresh Operation, Refresh Rate is Programmable
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