McASP Registers
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22.4.1.16 Receive Frame Sync Control Register (AFSRCTL)
The receive frame sync control register (AFSRCTL) configures the receive frame sync (AFSR). The
AFSRCTL is shown in Figure 22-54 and described in Table 22-27.
Figure 22-54. Receive Frame Sync Control Register (AFSRCTL)
31 16
Reserved
R-0
15 7 6 5 4 3 2 1 0
RMOD Reserved FRWID Reserved FSRM FSRP
R/W-0 R-0 R/W-0 R-0 R/W-0 R/W-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 22-27. Receive Frame Sync Control Register (AFSRCTL) Field Descriptions
Bit Field Value Description
31-16 Reserved 0 Reserved. The reserved bit location always returns the default value. A value written to this field
has no effect. If writing to this field, always write the default value for future device compatibility.
15-7 RMOD 0-1FFh Receive frame sync mode select bits.
0 Burst mode.
1h Reserved.
2h-20h 2-slot TDM (I2S mode) to 32-slot TDM.
21h-17Fh Reserved.
180h 384-slot TDM (external DIR IC inputting 384-slot DIR frames to McASP over I2S interface).
181h-1FFh Reserved.
6-5 Reserved 0 Reserved. The reserved bit location always returns the default value. A value written to this field
has no effect. If writing to this field, always write the default value for future device compatibility.
4 FRWID Receive frame sync width select bit indicates the width of the receive frame sync (AFSR) during its
active period.
0 Single bit.
1 Single word.
3-2 Reserved 0 Reserved. The reserved bit location always returns the default value. A value written to this field
has no effect. If writing to this field, always write the default value for future device compatibility.
1 FSRM Receive frame sync generation select bit.
0 Externally-generated receive frame sync.
1 Internally-generated receive frame sync.
0 FSRP Receive frame sync polarity select bit.
0 A rising edge on receive frame sync (AFSR) indicates the beginning of a frame.
1 A falling edge on receive frame sync (AFSR) indicates the beginning of a frame.
3852
Multichannel Audio Serial Port (McASP) SPRUH73H–October 2011–Revised April 2013
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