第1讲 DSP 2407 概述

• The SARAM (starting at 8000h in program memory) is accessible in external memory space (for 2407A • only), if the on-chip SARAM is not enabled.
3.flash EEPROM
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Flash EEPROM provides an attractive alternative to masked program ROM. Like ROM, Flash is nonvolatile. • However, it has the advantage of reprogrammability. The LF2407A incorporates one 32K 16-bit • Flash EEPROM module in program space. The Flash module has multiple sectors that can be individually protected while erasing or programming. • The sector size is non-uniform and partitioned as 4K/12K/12K/4K sectors.
• TMS320lf2407A属于TI公司C2000XILIE 的定点DSP。 • LF代表片内FLASH EPROM。 • LC代表低电压CMOS ROM。 • 比如：TMS320LC2407(2401 2402 2403 2406)A。 • TMS320LC2406（2401 2402 2404）A
DSP的存储器结构
程序存储空间
名词解释：
• 1.RAM: Dual-Access RAM:544个16位的字； The 240xA DARAM allows writes to and reads from the RAM in the same cycle. The DARAM is configured in three blocks: block 0 (B0), block 1 (B1), and block 2 (B2). Block 1 contains 256 words and Block 2 contains 32 words, and both blocks are located only in data memory space.
第一讲 DSP 2407 概述
TSM320系列DSP
• 不同公司（如TI、AD、MOTOROLA）分别 有多种系列的DSP产品。 • TI公司的TMS320系列包括：定点 （2000/5000系列）、浮点（3000/6000系 列）、多处理器（8000系列）数字信号处理 器。其中2000系列有部分是DSP控制器 （F24X、F240X）。
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避免了与外部存储器交换数据所需要的等待状 态，从而可以取得比采用外部存储器更高的性 能。 价格比外部存储器更加便宜；
维持片内存储器中的数据需要的功耗低于外部 存储器的功耗。
0000H~ 003FH:段程序存储空间的内容
• • • • • • • • • • • • • • • • rsvect int1: int2: int3: int4: int5: int6: int7: int8: int9: int10: int11: int12: int13: int14: int15: B B B B B B B B B B B B B B B B _c_int0 int1 _c_int2 int3 int4 int5 int6 int7 int8 int9 int10 int11 int12 int13 int14 int15 ;00h reset0 ;02h INT1 ;04h INT2 ;06h INT3 ;08h INT4 ;0Ah INT5 ;0Ch INT6 ;0Eh reserved ;10h INT8 user-defined ;12h INT9 user-defined ;14h INT10 user defined ;16h INT11 user defined ;18h INT12 user defined ;1Ah INT13 user defined ;1Ch INT14 user defined ;1Eh INT15 user defined
1. 意：
（1）When CNF = 1, addresses FE00h−FEFFh and FF00h−FFFFh are mapped to the same physical block (B0) in program-memory space. For example, a write to FE00h has the same effect as a write to FF00h. For simplicity, addresses FE00h−FEFFh are referred to as reserved when CNF = 1. （2）When CNF = 0, addresses 0100h−01FFh and 0200h−02FFh are mapped to the same physical block (B0) in data-memory space. For example,a write to 0100h has the same effect as a write to 0200h. For simplicity, addresses 0100h−01FFh are referred to as reserved.
• TMS320LF240x系列DSPTMS320C2XX系 列是TI公司的第二代改进型DSP，此后又陆续 推出LF2406、LF2407等C2XX DSP。 LF2407为单片数字电机控制器制定了标准， 执行速度可达30MIPS，指令几乎都可在33ns 的单周期内完成，可对复杂杂的控制算法进行 实时处理。（2812）
• code security module • 240xA devices incorporate a “code security module” which protects the contents of program memory from • unauthorized duplication. Passwords stored in password locations (PWL) 0040h to 0043h are used for this • purpose.
2.SRAM • single-access RAM (SARAM) • There are 2K words × 16 bits of SARAM on some of the 240xA devices. • The PON and DON bits select SARAM(SCSR2 ) (2K) mapping in program space, data space, or both. • At reset, these bits are 11, and the onchip SARAM is mapped in both the program and data spaces.
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5个外部中断（两个电机驱动保护、复 位和两个可屏蔽中断）。
������ 1. 544字×16位片内数据/程序双口RAM ������ 2.32K字×16位片内程序FLASH������ 3.192K字×16位最大寻址空间（64K字程序 空间、64K字数据空间、64K字I/O空间） ������ 4. 外部存储器接口模块：软件等待状态发 生器、16位地址数据总线
Block 0 contains 256 words, and can be configured to reside in either data or program memory space. • The SETC CNF (configure B0 as program memory) and CLRC CNF (configure B0 as data memory) instructions allow dynamic configuration of the memory maps through software.
（3）当CFN为1时，B0为片上DARAM程 序存储器。而数据存储空间的0200H～ 02FFH为保留的数据存储区。 CFN:为ST1的第12位： ST1为状态寄存器. on-chip RAM configuration control bit (CNF)
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240xA devices incorporate a security feature that prevents external access to program memory. This feature is useful in preventing unauthorized duplication of proprietary code. If access to Flash/ROM contents are desired for debugging purposes, two actions need to be taken: 1. A “dummy” read of locations 40h, 41h, 42h and 43h (of program memory space) is necessary. The word “dummy” indicates that the destination address of this read is insignificant. NOTE: Step 2 is not required if 40h−43h contain 0000 0000 0000 0000h or FFFF FFFF FFFF FFFFh. 2. A 64-bit password (split as four 16-bit words) must be written to the data-memory locations 77F0h, 77F1h, 77F2h, and 77F3h. The four 16-bit words written to these locations must match the four words stored in 40h, 41h, 42h, and 43h (of program memory space), respectively. The device becomes “unsecured” one cycle after the last instruction that unsecures the part.