TNETV2840ENGGU datasheet(42/91 Pages) TI1

42 / 91 page

Functional Overview

December 1999 − Revised October 2008

SPRS122F

The McBSP is fully static and operates at arbitrarily low clock frequencies. For the maximum McBSP

multichannel operating frequency, see Section 5.9 of this data manual.

3.2.3.3

McBSP1 and McBSP2

The four McBSP1s from each subsystem share the same external signal pins. The four McBSP2s from each

subsystem share the same set of external signal pins. They can only operate in either of the following modes:

•

multichannel mode (x_BCLKR, x_BCLKX, x_BFSR, and x_BFSX are external and the McBSPs share

TDM stream with no single time slot assigned to more than one McBSP)

•

standard serial port mode (x_BCLKR, x_BCLKX, x_BFSR, and x_BFSX are external and only one McBSP

is enabled at one time).

For McBSP1 and McBSP2, no other mode is supported.

3.2.3.4

SA Multiplexer

The SA1 and SA2 multiplexers provide multiplexing for the four McBSP1s and the four McBSP2s from each

subsystem and present the data path to the device boundary. All the same functional pins from the four

McBSP1s are multiplexed together by SA1 and connect to the device external pins. All the same functional

pins from the four McBSP2s are multiplexed together by SA2 and connect to the device external pins. The

functional pins are: data receive (BDRn), data transmit (BDXn), receive frame sync (BFSRn), transmit frame

sync (BFSXn), receive shift clock (BCLKRn), and transmit shift clock (BCLKXn).

When McBSP operates in multichannel mode, software shall ensure that the same channel (time slot) not be

assigned by more than one subsystem. If more than one subsystem enables the same transmit time slot, the

results are undefined.

Figure 3−20 shows 5441 block diagram with SA1 logic; SA2 logic is identical.

DSP Subsystem A

DSP ID: 0000

McBSP1

DSP ID: 0001

DSP Subsystem B

McBSP1

DSP ID: 0010

DSP Subsystem C

McBSP1

DSP Subsystem D

DSP ID: 0011

SA1

NOTE: SA is the MUX/Arbitration logic for McBSP1 operation.

Figure 3−20. SA Multiplexer for McBSP1 Operation

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