MPC8280 datasheet(604/1386 Pages) FREESCALE

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Serial Interface with Time-Slot Assigner

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

15-26

Freescale Semiconductor

Kbps. The MPC8280 is an IDL slave device that is clocked by the IDL bus master (physical layer device)

and has separate receive and transmit sections. Although the MPC8280 has eight TDMs, it can support

only four independent IDL buses (limited by the number of serials that support IDL) using separate clocks

and sync pulses. Figure 15-21 shows an application with two IDL buses.

Figure 15-21. Dual IDL Bus Application Example

15.6.1

IDL Interface Example

An example of the IDL application is the ISDN terminal adaptor shown in Figure 15-22.. In such an

application, the IDL interface is used to connect the 2B+D channels between the MPC8280, CODEC, and

S/T transceiver. One of the MPC8280’s SCCs is configured to HDLC mode to handle the D channel;

another MPC8280’s SCC is used to rate adapt the terminal data stream over the first B channel. That SCC

is configured for HDLC mode if V.120 rate adaptation is required. The second B channel is then routed to

the CODEC as a digital voice channel, if preferred. The SPI is used to send initialization commands and

periodically check status from the S/T transceiver. The SMC connected to the terminal is configured for

UART.

MPC8280

S/T

IDL1

S/T

Interfaces

IDL2

ISDN TE

Interfaces

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