MC145572PB Freescale Semiconductor, MC145572PB Datasheet - Page 125

• Manufacturer Part Number: MC145572PB
• Manufacturer: Freescale Semiconductor

Specifications of MC145572PB

• Number Of Line Interfaces: 1
• Control Interface: HDLC
• Lead Free Status / Rohs Status: Not Compliant

Freescale Semiconductor, Inc.
8
GCI MODE FUNCTIONAL DESCRIPTION
8.1
FUNCTIONAL OVERVIEW
The MC145572 is configurable for the General Circuit Interface or GCI operation. GCI is a time divi-
sion multiplex bus, that combines the ISDN 2B+D data and control/status information onto four signal
pins. There are two clocks per data bit and a single frame synchronization pulse, FSC.
In GCI mode, the MC145572 supports the full set of commands and indications over the Command/
Indicate channel. The monitor channel is used for sending and receiving maintenance channel mes-
sages and accessing the internal MC145572 registers.
As a GCI slave, the MC145572 accepts clock frequencies between 512 kHz and 8.192 MHz. As a
GCI master, the MC145572 operates at either 512 kHz or 2.048 MHz. Figure 8–1 is a typical con-
figuration for the MC145572 in GCI mode. The MC145572 is configured for GCI operation when the
MCU/GCI pin is tied low. The PAR/SER pin must also be tied low.
For More Information On This Product,
MOTOROLA
MC145572
8–1
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