參數(shù)資料
型號(hào)： SAA7284
廠商： NXP Semiconductors N.V.
英文描述： Terrestrial digital sound decoder for conventional intercarrier PLL-IF systems
中文描述： 地面數(shù)字音頻解碼器為傳統(tǒng)載波鎖相環(huán)中頻系統(tǒng)
文件頁(yè)數(shù)： 12/40頁(yè)
文件大?。?/td> 182K
代理商： SAA7284
1996 Oct 24
12
Philips Semiconductors
Preliminary specification
Terrestrial digital sound decoder for
conventional intercarrier PLL-IF systems
SAA7284
I
2
C-BUS FORMATS
The SAA7284 contains an I
2
C-bus slave transceiver (up to 400 kHz) permitting a master device to:
Read decoder status information derived from the transmitted digital audio signal
Read an error count byte to determine the bit error rate for user mute purposes and to indicate quality of NICAM signal
Write control codes to select PAL I or PAL BGH configurations
Write control codes to select the available analog switching configurations
Write upper and lower error count limits for automatic muting function
Read additional transmitted data bits. Their purpose has yet to be defined but accessibility is provided to allow future
services to be implemented in receiver software.
I
2
C-bus slave address
An address select pin (ADSEL) is provided to allow selection of one of two different slave addresses. The logic state of
the ADSEL pin is reflected in the least significant bit of the I
2
C-bus slave address.
Slave address = 101101X (R/W) [ADSEL = 1, address = B6 (R/W) ADSEL = 0, address = B4 (R/W)].
Table 1
SAA7284 slave address
The SAA7284 does not acknowledge the I
2
C-bus general call address.
Slave receiver format
The slave receiver format is shown in Table 2.
Table 2
Slave receiver format
Table 3
Explanation of Table 2
The sub-address is auto-incremented by the SAA7284, for each data byte received. When the sub-address is equal to
04 (HEX), on reception of the next data byte, the sub-address will reset to 00 (HEX).
BITS
A7
A6
A5
A4
A3
A2
A1
A0
1
0
1
1
0
1
selected by ADSEL
read/write
START
slave_addr
ACK
sub_addr
ACK
data_byte
ACK
n-bytes
data_byte
ACK
STOP
ITEM
DESCRIPTION
START
Slave_addr
X
W
ACK
Sub_addr
Data_byte
STOP
I
2
C-bus start condition
101101XW
logic 0 when ADSEL = 0; logic 1 when ADSEL = 1
logic 0, I
2
C-bus write to slave receiver
I
2
C-bus acknowledge condition generated by slave receiver
sub-address range 00 to 04 (HEX)
data byte transmitted to slave receiver
I
2
C-bus stop condition
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