Microchip Technology dsPIC30F - Page 592

dsPIC30F Family Reference Manual
DS70069C-page 22-26 © 2004 Microchip Technology Inc.
Figure 22-14: AC-Link Signal Connections
Figure 22-15: AC-Link Data Frame
Figure 22-16: Frame Sync Timing, AC-Link Start of Frame
The DCI module has two Operating modes for the AC-Link protocol to accommodate the 20-bit
data time slots. These Operating modes are selected by the COFSM<1:0> control bits
(DCICON1<1:0>). The first AC-Link mode is called ‘16-bit AC-Link mode’ and is selected by
setting COFSM<1:0> = 10b. The second AC-Link mode is called ‘20-bit AC-Link mode’ and is
selected by setting COFSM<1:0> = 11b.
dsPIC
®
(AC ‘97
Controller)
AC ‘97
Codec
24.576
MHz
BIT_CLK
SYNC
SDATA_OUT
SDATA_IN
/RESET
CSCK
COFS
CSDO
CSDI
I/O
Tag
Frame
Command
Address
Command
Data
Slot 3
Left PCM
Data
Slot 4
Right PCM
Data
Slot 10
Line 2
DAC
Slot 11
Handset
DAC
Slot 12
Codec I/O
Control
Tag
Frame
Status
Address
Status
Data
Slot 3
Left PCM
Data
Slot 4
Right PCM
Data
Slot 10
Line 2
ADC
Slot 11
Handset
ADC
Slot 12
Codec I/O
Status
16 20 20 20 20 20 20
20
256
SYNC
SDATA_OUT
SDATA_IN
Tag
MSb
CSCK
Data
COFS
Tag
bit 14
S12
LSb
S12
bit 1
S12
bit 2
Tag
bit 13
Frame Synch Edge Sampled
First bit of Data Frame Sampled