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PSD4235G2 データシート(PDF) 20 Page - STMicroelectronics |
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PSD4235G2 データシート(HTML) 20 Page - STMicroelectronics |
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20 / 89 page  PSD4235G2 20/89 DETAILED OPERATION As shown in Figure 4, the PSD consists of six ma- jor types of functional blocks: s Memory Blocks s PLD Blocks s MCU Bus Interface s I/O Ports s Power Management Unit (PMU) s JTAG-ISP Interface The functions of each block are described in the following sections. Many of the blocks perform multiple functions, and are user configurable. Memory Blocks The PSD has the following memory blocks: – Primary Flash memory – Secondary Flash memory –SRAM The Memory Select signals for these blocks origi- nate from the Decode PLD (DPLD) and are user- defined in PSDsoft Express. Table 28 sumamarizes the sizes and organisa- tions of the memory blocks. Table 28. Memory Block Size and Organization Primary Flash Memory Secondary Flash Memory SRAM Sector Number Sector Size (x16) Sector Select Signal Sector Size (x16) Sector Select Signal SRAM Size (x16) SRAM Select Signal 0 32K FS0 4K CSBOOT0 4K RS0 1 32K FS1 4K CSBOOT1 2 32K FS2 4K CSBOOT2 3 32K FS3 4K CSBOOT3 4 32K FS4 5 32K FS5 6 32K FS6 7 32K FS7 Totals 512KByte 8 Sectors 32KByte 4 Sectors 8KByte |
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