Motorola DSP56012 Benutzerhandbuch
6-14
DSP56012 User’s Manual
MOTOROLA
Serial Audio Interface
Serial Audio Interface Programming Model
6.3.2.10
RCS Receiver Data Word Truncation (RDWT)—Bit 10
The read/write Receiver Data Word Truncation (RDWT) control bit selects which
24-bit portion of a received 32-bit word will be transferred from the shift register to
the data register. When RDWT is cleared, the first 24 bits received are transferred to
the data register. When RDWT is set, the last 24 bits received are transferred to the
data register. The RDWT bit is ignored if RWL[1:0] are set for a word length other
than 32 bits (see Figure 6-9 on page 6-14).The RDWT bit is cleared during hardware
reset and software reset.
24-bit portion of a received 32-bit word will be transferred from the shift register to
the data register. When RDWT is cleared, the first 24 bits received are transferred to
the data register. When RDWT is set, the last 24 bits received are transferred to the
data register. The RDWT bit is ignored if RWL[1:0] are set for a word length other
than 32 bits (see Figure 6-9 on page 6-14).The RDWT bit is cleared during hardware
reset and software reset.
Figure 6-8 Receiver Relative Timing (RREL) Programming
Figure 6-9 Receiver Data Word Truncation (RDWT) Programming
MSB
LSB
LSB MSB
SDI
WSR
MSB
Left
Right
MSB
LSB
LSB MSB
SDI
WSR
MSB
Left
Right
LSB
RREL = 0
RREL = 1
AA0434
SDI
WSR
SDI
1 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32
SCKR
Left
Right
RDWT = 0
RDWT = 1
1 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32
AA0435k