CP3BT23_14 Datasheet, PDF (180/324 Pages) Texas Instruments – CP3BT23 Reprogrammable Connectivity Processor with Bluetooth and Dual CAN Interfaces

CP3BT23
SNOSCX3A – JULY 2013 – REVISED JANUARY 2014
www.ti.com
19.6.4 IOM-2 Mode
The AAI can operate in a special IOM-2 compatible mode to allow to connect to an external ISDN
controller device. In this IOM-2 mode, the AAI can only operate as a slave, i.e. the bit clock and frame
sync signal is provided by the ISDN controller. The AAI only supports the B1 and B2 data of the IOM-2
channel 0, but ignores the other two IOM-2 channels. The AAI handles the B1 and B2 data as one 16-bit
data word.
The IOM-2 interface has the following properties:
• Bit clock of 1536 kHz (output from the ISDN controller)
• Frame repetition rate of 8 ksps (output from the ISDN controller)
• Double-speed bit clock (one data bit is two bit clocks wide)
• B1 and B2 data use 8-bit log PCM format
• Long frame sync pulse Figure 19-9 shows the structure of an IOM-2 Frame.
SFS
STD/SRD B1 B2 M C IC1 IC2 M C
C
IOM-2 Channel 0
IOM-2 Channel 1
IOM-2 Channel 2
IOM-2 Frame (125 µs)
Figure 19-9. IOM-2 Frame Structure
DS162
Figure 19-10 shows the connections between an ISDN controller and a CP3BT23 using a standard IOM-2
interface for the B1/B2 data communication and the external bus interface (IO Expansion) for controlling
the ISDN controller.
SCK
CP3BT2x
SFS
STD
SRD
A[7:0]
D[7:0]
SELIO
RD
Bit Clock
Frame Sync
ISDN Controller
Data In
Data Out
Address
Data
Chip Select
Output Enable
DS241
Figure 19-10. CP3BT23/ISDN Controller Connections
180 Advanced Audio Interface
Submit Documentation Feedback
Product Folder Links: CP3BT23
Copyright © 2013–2014, Texas Instruments Incorporated