MC68SC302 PRODUCT INFORMATION

Figure 2. Passive NT Terminal Adaptor Block Diagram

Figure 3 shows a basic rate terminal adaptor with the 4-wire S/T interface. This architecture is almost identical

to the U interface TA with the exception that the TA clock source is provided to the S/T transceiver from the

MC68SC302.

Figure 3. Passive TE Terminal Adaptor Block Diagram with S/T Interface

Figure 4 shows a more full featured terminal adaptor. The two added features are the “Plain Old Telephone”

(POTs) interface and a optional modem datapump. Up to two POTs interfaces can be added on the board to

support simultaneous B channel voice call. The ISA interface provides a separate chip select for an external

data pump which uses an MC145480 to produce an 8khz PCM output that can be directly connected to the

IDL or GCI bus.

MC68SC302

145572 U

I/F

LINE I/F

IDL OR GCI BUS

SERIAL

EEPROM

ISA BUS

20.048 MHZ CLOCK

20.048 MHZ

MC68SC302

145574 S/T

I/F

LINE I/F

IDL OR GCI BUS

SERIAL

EEPROM

ISA BUS

15.36 MHZ CLOCK

15.36 MHZ

Freescale Semiconductor, Inc.

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