MPC8280 datasheet(584/1386 Pages) FREESCALE

584 / 1386 page

Serial Interface with Time-Slot Assigner

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

15-6

Freescale Semiconductor

At its most flexible, the TSA can provide four separate TDM channels, each with independent receive and

transmit routing assignments and independent sync pulse and clock inputs. Thus, the TSA can support

eight, independent, half-duplex TDM sources, four in reception and four in transmission, using eight sync

inputs and eight clock inputs. Figure 15-3 shows a dual-channel example.

Figure 15-3. Dual TDM Channel Example

In addition to channel programming, the TSA supports up to four strobe outputs that may be asserted on a

bit or byte basis. These strobes are completely independent from the channel routing used by the SCCs and

SMCs. The strobe outputs are useful for interfacing to other devices that do not support the multiplexed

interface or for enabling/disabling three-state I/O buffers in a multiple-transmitter architecture. Notice that

open-drain programming on the TXDx pins that supports a multiple-transmitter architecture occurs in the

parallel I/O block. These strobes can also be used for generating output wave forms to support such

applications as stepper-motor control.

Most TSA programming is done in the two 256-

× 16-bit SIx RAMs. These SIx RAMs are directly

accessible by the core in the internal register section of the MPC8280 and are not associated with the

dual-port RAM. One SIx RAM is always used to program the transmit routing; the other is always used to

SCC3

SMC1

TDMa Rx

TSA

TDMa

TDMb

TDMa Tx SYNC

TDMa Tx CLOCK

SCC2

SMC1

SCC2

TDMa Rx Sync

TDMa Rx Clock

TDMa Rx

SCC3

SCC4

TDMa Tx

TDMb Tx Sync

TDMb Tx Clock

TDMb Rx Sync

TDMb Rx Clock

SCC2

SMC1

TDMb Rx

Note:

SCCs can receive on one TDM and transmit on another (SCC2 and SCC3).

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