MOTO MPx220 与Dopod 575/585 之内核CPU的比较 (by finnce)

    MPx220 与 575正是棋逢对手的两款SP手机，性能价位都差不多，因此在论坛上也是多有争论。这里，把两款手机的CPU做个比较。文章内容来自TI的网站，可以参考以下网址:OMAP730:http://focus.ti.com/general/docs/wtbu/wtbuproductcontent.tsp?templateId=6123&navigati "http://bible.younet.com//add.php?edit_act=pic&id=67833" width=400 border=1>

OMAP1611:

    看来两款芯片的总体构架相似，有相同的核心子系统(Core Subsystem),主要在DSP（数字信号处理）部分不同。

    我们来比较一下两种芯片的概述：

730：

The OMAP730 is a single chip that integrates a ARM926EJ-S™ core for application processing and TI’s GSM/GPRS digital baseband modem. The OMAP730 offers twice the application performance over the previous generation while doubling the standby time for handsets, smartphones and PDAs. It is intended for high-volume wireless OEMs and ODMs and is not available through distributors.

1611：

The OMAP1611 processor is a single-chip application processor that supports all cellular standards, and complements any modem or chipset and any air interface. It is intended for high-volume wireless OEMs and ODMs and is not available through distributors.

    主要内容差不多，不必细看。

    由于采用相同的 ARM926TEJ Core Subsystem核心子系统，所以两种芯片的总体系能也相差不大。

    这是两种芯片相同的概述：（低功耗，高性能的CMOS技术）：

Low-Power, High-Performance CMOS Technology

• Low-voltage 130 nm technology
• 1.1 - 1.5V cores, 1.8 - 2.75V IO
• Extremely low power consumption: less than 10 µA in standby mode
• Split power supplies for application processing, digital baseband and real-time clock enable precise control over power consumption
• Optimized clocking and power management: Only two clocks required at 13 MHz and 32 kHz

ARM内核部分是这样说的：

ARM926TEJ Core Subsystem

• ARM926EJ-S V5 architecture up to 200 MHz (maximum frequency)
• 16 kB I-cache; 8 kB D-cache
• Java acceleration in hardware (都有Java 硬件加速）
• Multimedia instruction set architecture (ISA) extension

    接下来，我们看看不同的DSP子系统部分( DSP SubSystem)

    730采用几个子系统组合而成，从图上我们可以看到ARM7 MCU和TMC320C。注意，其中有个MCU(微控制单元)

GSM/GPRS Digital Baseband Subsystem

• Class 12 GPRS ROM-based DBB
• E-GPRS interface for EDGE co-processor
• 384 K-bytes internal SRAM
• E-OTD and TTY support
• Quad vocoder with EFR, FR, HR, AMR
• GSM ultra-low power device (ULPD)
• SIM interface

    而1611则是相对集成的子系统TMS320C55x，可以看出，比730少了个MCU。

TMS320C55x DSP core subsystem

• Up to 204 MHz (maximum frequency)
• 32K x 16-bit on-chip dual-access RAM (DARAM) (64 KB)
• 48K x 16-bit on-chip single-access RAM (SARAM) (96 KB)
• 24 KB I-cache
• One/two instructions executed per cycle
• Video hardware accelerators for DCT, iDCT, pixel interpolation, and motion estimation for video compression

ARM926TEJ core subsystem

接下来看看应用子系统：

730：

Application Subsystem

• Supports all leading operating systems
• DMA with 4 physical and 17 logical channels and a dedicated 2D graphics engine
• Programmable GPIO keyboard interface
• 54-Mbps WLAN interface
• Security acceleration in hardware:
  • Secure bootloader
  • 48 kB of secure ROM
  • 16 kB of secure RAM
  • Hardware acceleration for security standards and random number generator
  • Unique die ID cell
  • Third-party Security software library
• Enhanced audio controller (EAC)
• Comprehensive memory controller for interfaces to:
  • 128 MB of mobile SDRAM
  • 256 MB Flash
  • NAND Flash controllers
  • 1.6 Mb ISRAM
• SD/MMC/SDIO interface
• Enhanced Trace Module for debug
• LCD controller
• uWire
• SPI
• 1-wire and HDQ interface
• Bluetooth data/audio interface
• USB On-the-Go
• Two high-speed 3.68 MHz UARTs
• Fast IrDA (FIR)
• Two 32-bit timers
• Parallel camera port
• Programmable three-color LED pulse generation
• I²C master/slave controller
• SmartCard interface

1611：

Application Subsystem

• Supports leading operating systems
• DMA with 4 physical and 17 logical channels and a dedicated 2D graphics engine
• USB On-the-Go (OTG)
• Two SD/MMC/SDIO ports
• Two high-speed 3.68 MHz UARTs
• I2C controller
• Two high-speed 3.68 MHz UARTs
• uWire
• CompactFlash
• Parallel and compact camera ports
• Enhanced Debug Trace (ETM) for debug
• Fast IrDA (FIR)
• SPI
• LCD controller
• 54-Mbps interface to WLAN 802.11a/b/g
• Comprehensive memory controller for interfaces to:
  • 128 MB of mobile SDRAM and mobile DDR
  • 256 MB Flash (for burst, programmable NOR flash)

   值得注意的是，1611多了下面的几个内容：

Security Acceleration in Hardware 硬件安全加速

2-Mb ISRAM 传说中的内部RAM，据说可以增强多媒体性能 

Memory Traffic Controller (TC) 内存流量控制

• 16-bit EMIFS external memory interface
• 16-bit EMIFF external memory interface

结论：可以看出TI是有意区分两种不同定位的产品的，但是由于总的来说都属于无线应用方案，又是采用相同的核心子系统，所以两种产品的表现较为接近。

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