MPC8280 datasheet(606/1386 Pages) FREESCALE

606 / 1386 page

Serial Interface with Time-Slot Assigner

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

15-28

Freescale Semiconductor

The basic rate IDL bus has the three following channels:

•

B1 is a 64-Kbps bearer channel

•

B2 is a 64-Kbps bearer channel

•

D is a 16-Kbps signaling channel

There are two definitions of the IDL bus frame structure—8 and 10 bits. The only difference between them

is the channel order within the frame. See Figure 15-23.

Figure 15-23. IDL Bus Signals

NOTE

Previous versions of Freescale IDL-defined bit functions called auxiliary

(A) and maintenance (M) were removed from the IDL definition when it

was concluded that the IDL control channel would be out-of-band. These

functions were defined as a subset of the Freescale SPI format called serial

control port (SCP). To implement the A and M bits as originally defined,

program the TSA to access these bits and route them transparently to an

SCC or SMC. Use the SPI to perform out-of-band signaling.

The MPC8280 supports all channels of the IDL bus in the basic rate. Each bit in the IDL frame can be

routed to any SCC and SMC or can assert a strobe output for supporting an external device. The MPC8280

supports the request-grant method for contention detection on the D channel of the IDL basic rate and

when the MPC8280 has data to transmit on the D channel, it asserts L1RQx. The physical layer device

monitors the physical layer bus for activity on the D channel and indicates that the channel is free by

asserting L1GRx. The MPC8280 samples the L1GRx signal when the IDL sync signal (L1RSYNCx) is

asserted. If L1GRx is asserted, the MPC8280 sends the first zero of the opening flag in the first bit of the

D channel. If a collision is detected on the D channel, the physical layer device negates L1GRx. The

L1CLK

L1SYNC

L1RXD

L1TXD

10-Bit IDL

L1RXD

L1TXD

8-Bit IDL

Notes:

1. Clocks are not to scale.

2. L1RQ

x and L1GRx are not shown.

MPC8280 Datasheet(PDF) 606 Page - Freescale Semiconductor, Inc

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