cp3bt13 National Semiconductor Corporation, cp3bt13 Datasheet - Page 116
cp3bt13
Manufacturer Part Number
cp3bt13
Description
Cp3bt13 Reprogrammable Connectivity Processor With Bluetooth-r And Can Interfaces
Manufacturer
National Semiconductor Corporation
Datasheet
1.CP3BT13.pdf
(232 pages)
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17.6.4
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.
Figure 62 shows the connections between an ISDN control-
ler and a CP3BT13 using a standard IOM-2 interface for the
B1/B2 data communication and the external bus interface
(IO Expansion) for controlling the ISDN controller.
Figure 62. CP3BT13/ISDN Controller Connections
CP3BT13
IOM-2 Mode
SELIO
A[7:0]
D[7:0]
SRD
SCK
SFS
STD
RD
STD/SRD
SFS
B1
IOM-2 Channel 0
Bit Clock
Frame Sync
Data In
Data Out
Address
Data
Chip Select
Output Enable
B2
Figure 61. IOM-2 Frame Structure
ISDN Controller
M
C
DS158
IC1
IOM-2 Frame (125 µs)
IOM-2 Channel 1
116
IC2
The IOM-2 interface has the following properties:
T Bit clock of 1536 kHz (output from the ISDN controller)
T Frame repetition rate of 8 ksps (output from the ISDN
T Double-speed bit clock (one data bit is two bit clocks
T B1 and B2 data use 8-bit log PCM format
T Long frame sync pulse
Figure 61 shows the structure of an IOM-2 Frame.
To connect the AAI to an ISDN controller through an IOM-2
compatible interface, the AAI needs to be configured in this
way:
T The AAI must be in IOM-2 Mode (AGCR.IOM2 = 1).
T The AAI operates in synchronous mode (AGCR.ASS =
T The AAI operates as a slave, therefore the bit clock and
T The frame sync length must be set to long frame sync
T The data word length must be set to 16-bit (AGCR.DWL
T The AAI must be set to normal mode (AGCR.SCS[1:0] =
T The internal frame rate must be 8 ksps (ACCR = 00BE).
17.6.5
In loopback mode, the STD and SRD pins are internally
connected together, so data shifted out through the ATSR
register will be shifted into the ARSR register. This mode
may be used for development, but it also allows testing the
transmit and receive path without external circuitry, for ex-
ample during Built-In-Self-Test (BIST).
M
controller)
wide)
0).
frame sync source selection must be set to external
(ACGR.IEFS = 1, ACGR.IEBC = 1).
(ACGR.FSS = 1).
= 1).
0).
C
Loopback Mode
IOM-2 Channel 2
C
DS162
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