McASP Registers
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
and described in
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
Copyright © 2011–2013, Texas Instruments Incorporated