參數(shù)資料
型號： TDA7546TR
廠商： 意法半導體
英文描述： Multichip module for TMC tuner applications
中文描述： 豐田汽車多芯片模塊調(diào)諧器應用
文件頁數(shù)： 34/68頁
文件大?。?/td> 823K
代理商： TDA7546TR
Functional description
TDA7546
34/68
The RAM buffer is used as a circular FIFO (
Figure 9
). If more than 24 blocks are written, the
oldest data will be overwritten. One level of the buffer consists of 4 bytes (2 information
bytes, 2 RDS data bytes). If less than 4 bytes of the RAM buffer are read out from the
master via the SPI or I
2
C interface, the buffer address will not be incremented.
Figure 10.
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 .
–
“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
Table 39
) and is cleared
only by reading the whole buffer (24 blocks).
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
1
3
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 =0
1
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
w
相關PDF資料
PDF描述
TDA7550 DIGITAL SIGNAL PROCESSING IC FOR SPEECH AND AUDIO APPLICATIONS
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