mcf5272 Freescale Semiconductor, Inc, mcf5272 Datasheet - Page 335

• Manufacturer Part Number: mcf5272
• Description: Mcf5272 Coldfire Integrated Microprocessor User
• Manufacturer: Freescale Semiconductor, Inc

MOTOROLA
13.6.4 Example 2: ISDN SOHO PBX with Ports 1, 2, and 3
In this example, port 0 is not used. The port 0 pins are multiplexed with UART0 and in this
example, port 0 is used to connect to an external transceiver to provide an RS232 interface.
Port 1 is programmed in slave mode and an external U (or S/T) transceiver is connected to
port 1. Port 2 and port 3 are used to connect up to four external PCM CODECs.
In the above example, Motorola’s MC14LC5480 CODECs and MC145572 U transceiver
are shown. The U transceiver in this example is connected to port 1 and the FSC1 frame
sync signal is used exclusively for synchronizing the data on the U transceiver’s IDL
interface. CODECs 1 and 2 are connected to delayed frame sync 2, DFSC2, which is the
output of programmable delay 2. Programmable delay 2 generates a delayed frame sync
with reference to FSC1. Similarly CODECs 3 and 4 are connected to DFSC3 which is the
output of programmable delay 3. Programmable delay 3 generates a delayed frame sync
also with reference to FSC1. The MC14LC5480 CODECs, when in IDL mode, may be
programmed using the FSR pin to select whether the CODEC is receiving and transmitting
on the B1 or the B2 time slot (see MC14LC5480 data sheet for further information).
Interface1
MCF5272
Chapter 13. Physical Layer Interface Controller (PLIC)
Figure 13-39. ISDN SOHO PABX Example
UART0
DFSC2
DFSC3
Dout1
FSC1
DCL1
Din1
DT
DT
Tx
Rx
IDL SYNC
DT
DR
DR
FST
IDL CLK
DT
DR
FST
BCLKT
FST
BCLKT
DR
BCLKT
FST
BCLKT
MC14LC5480
MC14LC5480
MC14LC5480
MC14LC5480
Transceiver
MC145572
RS232
CODEC 1
CODEC 2
CODEC 3
CODEC 4
BCLKR
BCLKR
BCLKR
BCLKR
FSR
FSR
FSR
FSR
Application Examples
Vdd
GND
Vdd
Vdd
Vdd
GND
13-39