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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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TDA7333N датащи(PDF) 19 Page - STMicroelectronics |
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TDA7333N датащи(HTML) 19 Page - STMicroelectronics |
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19 / 36 page  TDA7333N Functional description 19/36 Figure 9. RAM buffer states The different states of the buffer are indicated with the help of following flags: – “bne”, buffer not empty. It is set as soon as one RDS block is written in the buffer, and reset when reading rds_int register. This flag is a bit of rds_int register, it is also an interrupt source (refer to Section 3.8.1). – “bfull”, buffer full. It is set when 24 RDS blocks have been written, that is to say that there is about 20 ms to read out the buffer content before an overflow occurs. This flag is an interrupt source. – “bovf”, buffer overflow. It is set if more than 24 RDS blocks are written. This flag is a bit of register rds_corrp (refer to Section 3.8.3) and is cleared only by reading the whole buffer (24 blocks). An address reset of the RAM buffer can be performed by writing a 1 to “ar_res” bit in rds_int register, it also forces a resynchronization. bne = 0 bfull = 0 bovf = 0 the read pointer reaches but doesn't go ahead the write pointer Rp Wp Rp Wp the read pointer doesn't go ahead the write pointer Rp bne = 1 bfull = 0 bovf = 0 bne = 0 bfull = 0 bovf = 0 0 Wp Rp Wp Rp Wp Rp the write pointer reaches position before the read pointer (24 data written before any read) the Wp reaches Rp overflow flag is set and the first data is overwritten Wp bne = 1 bfull = 0 bovf = 0 bne = 1 bfull = 1 bovf = 1 1 Rp Wp reset status Wp Rp write next three data into buffer (internally) bne = 1 bfull = 0 bovf = 0 Wp 1 Rp Wp read three data from buffer (externally) bne = 1 bfull = 0 bovf = 0 Rp 13 4 5 6 Note : The read pointer Rp is driven externally through micro read access, and the write pointer Wp is driven internally on every incoming block. 0 write Wp Rp bne = 1 bfull = 1 bovf = 01 write Wp and Rp are moving together overwriting next data read read bne = 0 bfull = 0 bovf = 0 Rp Wp write the first data into buffer (internally) 2 0 1 2 23 22 21 0 1 2 23 22 21 3 0 1 2 23 22 21 3 0 1 2 23 22 21 3 0 1 2 23 22 21 3 0 1 2 23 22 21 3 0 1 2 23 22 21 3 0 1 2 23 22 21 3 0 1 2 23 22 21 write write read |
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