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ST20-GP6 Datasheet(PDF) 7 Page - STMicroelectronics |
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ST20-GP6 Datasheet(HTML) 7 Page - STMicroelectronics |
7 / 123 page ST20-GP6 7/123 2 ST20-GP6 architecture overview The ST20-GP6 consists of an ST20 CPU plus application specific DSP hardware for handling GPS signals, plus a dual channel UART, ROM and RAM memory, parallel IO, real time clock and watchdog functions. Figure 2.1 shows the subsystem modules that comprise the ST20-GP6. These modules are outlined below and more detailed information is given in the following chapters. DSP The ST20-GP6 includes DSP hardware for processing signals from the GPS satellites. The DSP module generates the pseudo-random noise (prn) signals, and de-spreads the incoming signal. It consists of a down conversion stage that takes the 4 MHz input signal down to nominally zero frequency both in-phase and quadrature (I & Q). This is followed by 12 parallel hardware channels for satellite tracking, whose output is passed to the CPU for further software processing at a programmable interval, nominally every millisecond. CPU The Central Processing Unit (CPU) on the ST20-GP6 is the ST20 32-bit processor core. It contains instruction processing logic, instruction and data pointers, and an operand register. It directly accesses the high speed on-chip memory, which can store data or programs. The processor can access up to 4 Mbytes of memory via the programmable memory interface. |
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