DSP has high-speed computing power and rich peripheral interfaces, and is widely used in embedded systems. Many DSP-based embedded systems are deployed in demanding environments or remote locations. When software upgrades or program updates are required, personnel cannot enter or reach the environment. Remote loading techniques must be used to complete upgrades and updates. Ethernet has the advantages of long transmission distance and high transmission rate, and is a good carrier for remote data transmission. Currently, mainstream DSP chips can extend the Ethernet interface. This paper combines Ethernet technology and TI DSP chip as an example to study DSP remote loading technology.
The core idea of ​​DSP remote loading includes three aspects:
1 DSP can send and receive remote control terminal data;
2 DSP can update the Flash area where the user program is stored;
3 DSP can get user configuration choices whether remote loading is required.
Based on the above three points, this paper studies the DSP network interface technology, DSP and Flash interface and drive technology, and remote loading configuration technology.
1 Remotely loaded hardware foundation
1.1 DSP Ethernet Interface Technology
(1) Extend the Ethernet interface through a dedicated interface chip
In TI's early DSPs, such as C5000, C6201, C6701 and other series, there is no integrated dedicated Ethernet controller inside the chip, and it is not possible to communicate directly with Ethernet. It must pass the DSP's EMIF (external storage interface) and dedicated interface chip. Connect to extend the Ethernet. These dedicated chips are CP2200, MC9S12NE6 and so on. Figure 1 shows the interface diagram of TMS320C5410 and CP2200 [1].
Figure 1 Schematic diagram of the interface between TMS320C5410 and CP2200
(2) Extend the Ethernet interface through an on-chip dedicated interface
With the improvement of DSP manufacturing process, many DSP chips have integrated Ethernet controllers, such as DM642, C6455, C6416, etc., and only need external physical layer chips (such as RTL8019AS, 82540EM, etc.) to expand the Ethernet interface. Figure 2 shows a schematic diagram of the DSP directly extending the Ethernet through an on-chip dedicated interface.
Figure 2 DSP directly expands the Ethernet schematic through an on-chip dedicated interface
1.2 programmable Flash chip
TI's high-speed DSPs (C5000, C6000 series) do not have on-chip non-volatile memory, and programs must be stored in external non-volatile memory. The DSP program is usually stored and loaded by a programmable flash memory. The commonly used Flash chips are Intel's E28Fxx series and AMD's AM29xx series. Figure 3 shows a typical interface circuit for DSP and Flash [2].
Figure 3 Typical interface circuit between DSP and Flash
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