Table 8-10, Esai receive network mode selection -28 – Freescale Semiconductor DSP56366 User Manual
Page 178
ESAI Programming Model
DSP56366 24-Bit Digital Signal Processor User Manual, Rev. 4
8-28
Freescale Semiconductor
8.3.4.7
RCR Receiver Word Alignment Control (RWA) - Bit 7
The Receiver Word Alignment Control (RWA) bit defines the alignment of the data word in relation to the
slot. This is relevant for the cases where the word length is shorter than the slot length. If RWA is cleared,
the data word is assumed to be left-aligned in the slot frame. If RWA is set, the data word is assumed to be
right-aligned in the slot frame.
If the data word is shorter than the slot length, the data bits which are not in the data word field are ignored.
For data word lengths of less than 24 bits, the data word is right-extended with zeroes before being stored
in the receive data registers.
8.3.4.8
RCR Receiver Network Mode Control (RMOD1-RMOD0) - Bits 8-9
The RMOD1 and RMOD0 bits are used to define the network mode of the ESAI receivers according to
. In the normal mode, the frame rate divider determines the word transfer rate – one word is
transferred per frame sync during the frame sync time slot, as shown in
possible to transfer a word for every time slot, as shown in
In order to comply with AC-97 specifications, RSWS4-RSWS0 should be set to 00011 (20-bit slot, 20-bit
word), RFSL and RFSR should be cleared, and RDC4-RDC0 should be set to $0C (13 words in frame).
8.3.4.9
RCR Receiver Slot and Word Select (RSWS4-RSWS0) - Bits 10-14
The RSWS4-RSWS0 bits are used to select the length of the slot and the length of the data words being
received via the ESAI. The word length must be equal to or shorter than the slot length. The possible
combinations are shown in
. See also the ESAI data path programming model in
and
Table 8-10 ESAI Receive Network Mode Selection
RMOD1
RMOD0
RDC4-RDC0
Receiver Network Mode
0
0
$0-$1F
Normal Mode
0
1
$0
On-Demand Mode
0
1
$1-$1F
Network Mode
1
0
X
Reserved
1
1
$0C
AC97