Texas Instruments OMAP5912 Reference Manual page 1659

Multimedia processor device overview and architecture

Hide thumbs Also See for OMAP5912:

Table of Contents

McBSP Exception/Error Conditions

McBSP Sample Rate Generator / McBSP Exception/Error Conditions

Double-Rate Clock Example

Internal FS(R/X)

Internal CLK(R/X)

McBSP Exception/Error Conditions

Multichannel Buffered Serial Ports (McBSPs)

There are five serial port events that can constitute a system error:

Receiver overrun (RFULL = 1)

This occurs when DRR1 has not been read since the last RBR-to-DRR

copy. Consequently, the receiver does not copy a new word from the

RBR(s) to the DRR(s) and the RSR(s) are now full with another new word

shifted in from DR. Therefore, RFULL = 1 indicates an error condition

wherein any new data that can arrive at this time on DR replaces the con-

tents of the RSR(s), and the previous word is lost. The RSRs continue to

be overwritten as long as new data arrives on DR and DRR1 is not read.

For more details about overrun in the receiver, see section 4.1.

Unexpected receive frame-synchronization pulse (RSYNCERR = 1)

This occurs during reception when RFIG = 0 and an unexpected frame-

synchronization pulse occurs. An unexpected frame-synchronization

pulse is one that begins the next frame transfer before all the bits of the

current frame have been received. Such a pulse causes data reception to

abort and restart. If new data has been copied into the RBR(s) from the

RSR(s) since the last RBR-to-DRR copy, this new data in the RBR(s) is

lost. This is because no RBR-to-DRR copy occurs; the reception has been

restarted. For more details about receive frame-synchronization errors,

see section 4.2.

Transmitter data overwrite

This occurs when the CPU or DMA controller overwrites data in the

DXR(s) before the data is copied to the XSR(s). The overwritten data nev-

er reaches the DX pin. For more details about overwrite in the transmitter,

see section 4.3.

WxBy = word x bit y

Chapters

Table of Contents