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Enhanced Serial Audio Interface (ESAI)
ESAI Programming Model
transfer rate – one word is transferred per frame sync during the frame sync time slot, as
shown in Figure 10-6. In network mode, it is possible to transfer a word for every time slot, as
shown in Figure 10-6. For more details, see Section 10.4, "Operating Modes".
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).
Table 10-10 ESAI Receive Network Mode Selection
RMOD1
0
0
0
1
1
10.3.4.9
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 Table 10-11. See also the ESAI data path
programming model in Figure 10-13 and Figure 10-14.
Table 10-11 ESAI Receive Slot and Word Length Selection
RSWS4
RSWS3
0
0
0
0
0
0
0
1
0
0
0
0
0
1
0
1
0
0
0
0
1
0
0
1
0
1
0
0
1
1
10-32
RMOD0
RDC4-RDC0
0
$0-$1F
1
$0
1
$1-$1F
0
X
1
$0C
RSWS2
RSWS1
RSWS0
0
0
1
0
0
0
0
0
1
0
0
1
1
0
0
0
1
1
0
1
0
0
1
0
0
1
1
1
1
1
DSP56367
Receiver Network Mode
Normal Mode
On-Demand Mode
Network Mode
Reserved
AC97
SLOT LENGTH
0
8
0
12
1
0
16
1
0
0
20
1
0
1
0
24
1
0
1
0
WORD LENGTH
8
8
12
8
12
16
8
12
16
20
8
12
16
20
24
MOTOROLA
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