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ADSP-2161 Arkusz danych(PDF) 7 Page - Analog Devices |
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ADSP-2161 Arkusz danych(HTML) 7 Page - Analog Devices |
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7 / 39 page  REV. 0 ADSP-216x –7– Program Memory Interface The on-chip program memory address bus (PMA) and on-chip program memory data bus (PMD) are multiplexed with the on- chip data memory buses (DMA, DMD), creating a single exter- nal data bus and a single external address bus. The external data bus is bidirectional and is 24 bits wide to allow instruction fetches from external program memory. Program memory may contain code and data. The external address bus is 14 bits wide. For the ADSP-216x, these lines can directly address up to 16K words, of which 2K are on-chip. The data lines are bidirectional. The program memory select ( PMS) signal indicates accesses to program memory and can be used as a chip select signal. The write ( WR) signal indicates a write operation and is used as a write strobe. The read ( RD) signal indicates a read operation and is used as a read strobe or output enable signal. The ADSP-216x processors write data from their 16-bit regis- ters to 24-bit program memory using the PX register to provide the lower eight bits. When the processor reads 16-bit data from 24-bit program memory to a 16-bit data register, the lower eight bits are placed in the PX register. The program memory interface can generate 0 to 7 wait states for external memory devices; default is to 7 wait states after RESET. Program Memory Maps Program memory can be mapped in two ways, depending on the state of the MMAP pin. Figure 4 shows the program memory map for the ADSP-2165/ADSP-2166. Figures 5 and 6 show the program memory maps for the ADSP-2161/ADSP-2162 and ADSP-2163/ADSP-2164, respectively. ADSP-2165/ADSP-2166 When MMAP = 0, on-chip program memory ROM occupies 12K words beginning at address 0x0000. Internal program memory RAM occupies 1K words beginning at address 0x3000. Off-chip program memory uses the 2K words beginning at address 0x3800. The ADSP-2165/ADSP-2166 does not support boot memory. When MMAP = 1, 2K words of off-chip program memory begin at address 0x0000. 10K words of on-chip program memory ROM at 0x800 to 0x2FFF, and the remainder 2K words of program memory ROM is at 0x3800 to 0x3FFF. Internal pro- gram memory RAM occupies 1K words at address 0x300 to 0x33FF. 0x0000 2K EXTERNAL MMAP = 0 12K 24 INTERNAL ROM 10K 24 INTERNAL ROM 1K 24 RAM RESERVED 2K 24 EXTERNAL 2K 24 INTERNAL ROM 1K 24 RAM RESERVED MMAP = 1 0x2FFF 0x3000 0x33FF 0x3400 0x37FF 0x3800 0x3FFF 0x0000 0x2FFF 0x3000 0x33FF 0x3400 0x37FF 0x3800 0x3FFF 0x07FF 0x0800 Figure 4. ADSP-2165/ADSP-2166 Program Memory Maps ADSP-2161/ADSP-2162 When MMAP = 0, on-chip program memory ROM occupies 8K words beginning at address 0x0000. Off-chip program memory uses the remaining 8K words beginning at address 0x2000. When MMAP = 1, 2K words of off-chip program memory begin at address 0x0000. 6K words of on-chip program memory ROM are at 0x0800 to 0x1FF0, and the remainder 2K words of pro- gram memory ROM is at 0x3800 to 0x3FFF. An additional 6K of off-chip program memory is at 0x2000 to 0x37FF. MMAP = 0 8K INTERNAL ROM RESERVED MMAP = 1 0x0000 0x1FF0 0x1FFF 0x2000 0x3FFF 2K EXTERNAL RESERVED 0x0000 0x1FF0 0x1FFF 0x2000 0x3FFF 6K INTERNAL ROM 6K EXTERNAL 2K INTERNAL ROM 0x7FFF 0x0800 0x37FF 0x3800 8K EXTERNAL Figure 5. ADSP-2161/ADSP-2162 Program Memory Maps ADSP-216x RESET IRQ2 BR BG MMAP SERIAL PORT 0 SERIAL PORT 1 PMS RD DMS BMS ADDRESS DATA CLKIN XTAL CLKOUT VDD GND CLOCK OR CRYSTAL 34 SCLK SCLK RFS OR IRQ0 TFS OR IRQ1 DT OR FO DR OR FI RFS TFS DT DR SERIAL DEVICE (OPTIONAL) SERIAL DEVICE (OPTIONAL) PROGRAM MEMORY (OPTIONAL) AD CS OE WE DATA MEMORY & PERIPHERALS AD CS OE WE 14 RW 16 D23-8 24 Figure 3. Basic System Configuration |
Podobny numer części - ADSP-2161_15 |
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Podobny opis - ADSP-2161_15 |
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