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MSM7584D Datasheet(PDF) 51 Page - OKI electronic componets |
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MSM7584D Datasheet(HTML) 51 Page - OKI electronic componets |
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51 / 58 page  ¡ Semiconductor MSM7584D 51/58 FEDL7584D-02 DATA CONFIGURATION IN THE EXTERNAL SERIAL REGISTER X Address Space The address space of the external serial register is accessed based on (word direction indicated by the X address) ¥ (1 Kb depth in Y direction). The maximum X address in word direction depends on the total memory capacity of serial registers connected. Since the leading 32 words (32 Kb) of the serial register are used as the channel index area, X address 020h onward can be used as the voice data area. CR5-B5 01 1 Total Memory Capacity (device name) 1 Mb (MSM6389) 4 Mb (MSM6684) 8 Mb (MSM6685) Number of words 1K words 4K words 8K words X address* 000h to 3FFh 0000h to 0FFFh 0000h to 1FFFh * 0000h to 001Fh are used as the channel index area. Y Address Space For 1 Kb ADPCM data in Y direction, 4 bits ¥ 256 samples = 1024 bits are stored in the 1 Kb memory area. One Y address is allocated to one sample (4 bits) of ADPCM data and addressing is made with 00h to FFh. 000h 01Fh 020h 3FFh X address (1 K words of 000h to 3FFh : 1 word = 1 Kb) Channel index area (32 words ¥ 1 Kb + 32 Kb) ADPCM (voice) data area 1 Kb in Y direction 1 word = 1 Kb 00h 01h FEh FFh Y address 4 bit 4 bit 4 bit 4 bit Figure 16 Address Space of 1 Mb Serial Register |
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