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。