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Physical Layer Interface Controller (PLIC)
MCF5272 ColdFire Integrated Microprocessor User’s Manual, Rev. 3
13-38
Freescale Semiconductor
13.6.3
Example 1: ISDN SOHO PBX with Ports 0, 1, 2, and 3
In this example, all four ports are used to connect an external transceiver and six CODECs. Port 0 and
port 1 are programmed in slave mode. An external transceiver, MC145574, is connected to port 0. Port 1,
2, and 3 are used to connect up to six external PCM CODECs.
Figure 13-37. ISDN SOHO PABX Example
In the previous example, Freescale’s MC14LC5480 CODECs and MC145574 S/T transceiver are shown.
The S/T transceiver in this example is connected to port 0 and the FSC0 frame sync signal is used
exclusively for synchronizing the data on the transceiver’s IDL interface. CODECs 1 and 2 are connected
to frame sync 1, FSC1. CODECs 3 and 4 are connected to DFSC2 which is the output of programmable
Din1
Dout1
FSC1
DCL1
MC145574
MC14LC5480
CODEC 4
CODEC5
Interface 1
DFSC2
DFSC3
CODEC6
Tx
DT
Rx
DR
CODEC 3
MC14LC5480
BCLKT
FST
IDL SYNC
IDL CLK
FSR
GND
Din0
Dout0
FSC0
DCL0
Interface 0
MC14LC5480
CODEC 2
DT
DR
CODEC 1
MC14LC5480
BCLKT
FST
FSR
GND
Vdd
DGrant
DRequest
DGNT0
DREQ0
MCF5272
BCLKR
Vdd
BCLKR
Vdd
FSR
Vdd
BCLKR
Vdd
FSR
Vdd
BCLKR