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參數(shù)資料
| 型號： | LPC2888FET180 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 16/32-bit ARM microcontrollers; 8 kB cache, up to 1 MB flash, Hi-Speed USB 2.0 device, and SDRAM memory interface |
| 中文描述： | 32-BIT, FLASH, 60 MHz, RISC MICROCONTROLLER, PBGA180 |
| 封裝： | 10 X 10 MM, 0.80 MM HEIGHT, PLASTIC, MO-195, SOT-640-1, TFBGA-180 |
| 文件頁數(shù)： | 15/34頁 |
| 文件大小： | 139K |
| 代理商： | LPC2888FET180 |
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LPC2880_LPC2888_1
Koninklijke Philips Electronics N.V. 2006. All rights reserved.
Preliminary data sheet
Rev. 01 — 22 June 2006
15 of 34
Philips Semiconductors
LPC2880; LPC2888
16/32-bit ARM microcontrollers with external memory interface
6.3 Cache
The CPU of the LPC2880/LPC2888 has been extended with a 2-way set-associative
cache controller. The cache is 8 kB in size and can store both data and instruction code.
If code that is being executed is present in the cache from a previous execution, the CPU
will not experience code fetch waits. Similarly, if requested data is present in the cache,
the CPU will not experience a data access wait.
The trade-off of introducing this cache is that each AHB access that bypasses the cache
will have an extra wait state inserted. Therefore it is advisable to enable instruction
caching (and preferably data caching as well) for all memories, to provide the highest
performance.
6.3.1
Cache operation
This cache works as follows, for each page of which the cache is enabled:
If a read is requested and the information is not in the cache (a cache miss), a line of
eight 32-bit words will be read from the AHB bus. The CPU waits until this process is
complete.
If a read is requested and the information is found in the cache (a cache hit), the
information is read from cache, with zero wait states.
If data is written, and the location is not in the cache (a cache miss), the data will be
written directly to memory.
If data is written, and the location is in the cache, because this location has been read
before (a cache hit), then data is written into the cache with zero wait states and the
cache line is marked as ‘dirty’.
If a ‘dirty’ cache line is about to be discarded because of a cache miss on a read
request, this line will first be written back to memory (a cache-line flush).
The cache can be set to data-only, instruction-only or combined (unified) caching. The
cache has 16 configurable pages, each 2 MB in range. The pages occupy the bottom
32 MB of the memory map. The virtual address and enable/disable status is configurable
for each page.
6.3.2
Features
8 kB, 2-way set-associative cache.
May be used as both an instruction and data cache.
Zero wait states for a cache hit.
16 configurable pages, each 2 MB in range.
6.4 Flash memory and programming
The LPC2888 incorporates 1 MB flash memory system, while the LPC2880 is a flash-less
device. The flash memory of the LPC2888 may be used for both code and data storage.
Programming of the flash memory may be accomplished in several ways. It may be
programmed In System via the USB port. The application program may also erase and/or
program the flash while the application is running, allowing a great degree of flexibility for
data storage, field firmware upgrades, etc.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LPC2888FET180,551 | 功能描述:ARM微控制器 - MCU ARM7 1MF/64KR/USBH RoHS:否 制造商:STMicroelectronics 核心:ARM Cortex M4F 處理器系列:STM32F373xx 數(shù)據(jù)總線寬度:32 bit 最大時鐘頻率:72 MHz 程序存儲器大小:256 KB 數(shù)據(jù) RAM 大小:32 KB 片上 ADC:Yes 工作電源電壓:1.65 V to 3.6 V, 2 V to 3.6 V, 2.2 V to 3.6 V 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:LQFP-48 安裝風(fēng)格:SMD/SMT |
| LPC2888FET180/01 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:16/32-bit ARM microcontrollers; 8 kB cache, up to 1 MB flash, Hi-Speed USB 2.0 device, and SDRAM memory interface |
| LPC2888FET180/01,5 | 功能描述:ARM微控制器 - MCU 16/32 bit micro RoHS:否 制造商:STMicroelectronics 核心:ARM Cortex M4F 處理器系列:STM32F373xx 數(shù)據(jù)總線寬度:32 bit 最大時鐘頻率:72 MHz 程序存儲器大小:256 KB 數(shù)據(jù) RAM 大小:32 KB 片上 ADC:Yes 工作電源電壓:1.65 V to 3.6 V, 2 V to 3.6 V, 2.2 V to 3.6 V 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:LQFP-48 安裝風(fēng)格:SMD/SMT |
| LPC2888FET180/D,55 | 制造商:NXP Semiconductors 功能描述:PHALPC2888FET180/D.551 32BIT ARM7 HS USB |
| LPC2888FET180/D,551 | 制造商:NXP Semiconductors 功能描述: |
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