4 dax clock input select (xcs[1:0])—bits 3–4, Table83 clock source selection, 5 xctr reserved bits—bits 5-9, 16-23 – Motorola DSP56012 User Manual
Page 219: 6 dax channel a validity (xva)—bit 10, 7 dax channel a user data (xua)—bit 11, 8 dax channel a channel status (xca)—bit 12, 9 dax channel b validity (xvb)—bit 13, Dax clock input select (xcs[1:0])—bits 3–4 -9, Xctr reserved bits—bits 5-9, 16-23 -9, Dax channel a validity (xva)—bit 10 -9
Digital Audio Transmitter
DAX Internal Architecture
MOTOROLA
DSP56012 User’s Manual
8-9
8.5.4.4
DAX Clock Input Select (XCS[1:0])—Bits 3–4
The XCS[1:0] bits select the source of the DAX clock and/or its frequency.
shows the configurations selected by these bits. These bits should be changed only
when the DAX is disabled.
Note:
The XCS bits are cleared by software reset and hardware reset.
8.5.4.5
XCTR Reserved Bits—Bits 5-9, 16-23
These XCTR bits are reserved and unused. They read as 0s and should be written
with 0s for future compatibility.
8.5.4.6
DAX Channel A Validity (XVA)—Bit 10
The value of the XVA bit is transmitted as the twenty-ninth bit (Bit 28) of Channel A
sub-frame in the next frame.
Note:
This bit is not affected by any of the DAX reset states.
8.5.4.7
DAX Channel A User Data (XUA)—Bit 11
The value of the XUA bit is transmitted as the thirtieth bit (Bit 29) of the Channel A
sub-frame in the next frame.
Note:
This bit is not affected by any of the DAX reset states.
8.5.4.8
DAX Channel A Channel Status (XCA)—Bit 12
The value of the XCA bit is transmitted as the thirty-first bit (Bit 30) of the Channel A
sub-frame in the next frame.
Note:
This bit is not affected by any of the DAX reset states.
8.5.4.9
DAX Channel B Validity (XVB)—Bit 13
The value of the XVB bit is transmitted as the twenty-ninth bit (Bit 28) of the Channel
B sub-frame in the next frame.
Note:
This bit is not affected by any of the DAX reset states.
Table 8-3
Clock Source Selection
XCS1
XCS0
DAX Clock Source
0
0
DSP Core Clock (f = 1024
×
fs)
0
1
ACI Pin, f = 256
×
fs
1
0
ACI Pin, f = 384
×
fs
1
1
ACI Pin, f = 512
×
fs