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Zakładka z wyszukiwarką danych komponentów |
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Zakładka z wyszukiwarką danych komponentów |
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MAS3549F Arkusz danych(PDF) 29 Page - Micronas |
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MAS3549F Arkusz danych(HTML) 29 Page - Micronas |
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29 / 92 page  DATA SHEET MAS 35x9F Micronas June 30, 2004; 6251-505-1DS 29 3.3.2.4. Read Memory (Codes Chex and Dhex) The MAS 35x9F has 2 memory areas of 2048 words denoted D0 and D1. The memory areas D0 and D1 can be written by using the codes Chex and Dhex, respectively. The Read D0 Memory command gives the controller access to all 20 bits of the D0/D1 memory cells. The telegram to read 3 words starting at location D1:100 is <DW 68 d0 00 00 03 01 00> <DW 69 <DR xx xd dd dd xx xd dd dd xx xd dd dd > 3.3.2.5. Short Read Memory (Codes C4hex and D4hex) Because most cells in the user interface are only 16 bits wide, it is faster and more convenient to access the memory locations with a special 16-bit mode for reading: This command is similar to the normal 20 bit read com- mand and uses the same command code Chex and Dhex for D0 and D1 memory, respectively, however it is followed by a 4hex rather than a 0hex. Example: Read 16 bits of D1:123 has the following I2C protocol: <DW 68 d4 00 read 16 bits from D1 00 01 1 word to be read 01 23 start address <DW 69 DR start reading dd dd > and read 3.3.2.6. Write Memory (Codes Ehex and Fhex) The memory areas D0 and D1 can be written by using the codes Ehex and Fhex, respectively. With the Write D0/D1 Memory command n 20-bit memory cells in D0 can be initialized with new data. Example: Write 80234hex to D1:456 has the following I2C protocol: <3a 68 f0 00 write D1 memory 00 01 1 word to write 04 56 start address 00 08 value = 80234hex 02 34> 3.3.2.7. Short Write Memory (Codes E4hex and F4hex) For faster access only the lower 16 bits of each mem- ory cell are written. The 4 MSBs of the cell are cleared. The command uses the same codes Ehex and Fhex for D0/D1 as for the 20-bit command but followed by a 4 rather than a 0. 3.3.2.8. Clear SYNC Signal (Code 5hex) After a successful decoding of an MPEG frame the sig- nal at pin SYNC rises and thus generates an interrupt event for the microcontroller. Issuing this command lets the signal at pin SYNC return to ‘0’. 1) send command (Read D0) 2) get register value SDW data_write c,0 0,0 SDW data_read A S DR A P n3,n2 n1,n0 P a3,a2 a1,a0 A A AN A A ....repeat for n data values.... WA A A WA A WA A WA WA A WA d3,d2 W W d1,d0 x,d4 x,x d3,d2 W W d1,d0 x,d4 x,x 1) send command (e.g. Short Read D0) 2) get register value SDW data_write W c,4 0,0 SDW data_read S DR P n3,n2 n1,n0 P a3,a2 a1,a0 A A N A ....repeat for n data values.... WA A A WA A WA A WA WA WA A d3,d2 W d1,d0 d3,d2 W d1,d0 SDW data_write e,0 0,0 x,x x,d4 P n3,n2 n1,n0 a3,a2 a1,a0 d3,d2 d1,d0 x,x x,d4 d3,d2 d1,d0 ....repeat for n data values.... WA A A WA A WA A WA A WA A WA A WA A WA SDW data_write e,4 0,0 P n3,n2 n1,n0 a3,a2 a1,a0 d3,d2 d1,d0 d3,d2 d1,d0 ....repeat for n data values.... WA A A WA A A WA A A WA A A WA A A WA SDW data_write 5,0 0,0 P WA A A WA |
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