MFC2000 datasheet(269/426 Pages) ETC

269 / 426 page

Hardware Description

MFC 2000 Multifunctional Peripheral Controller 2000

100723A

Conexant

14-3

Bit 8:

Disable reference hardware DMA.

Setting this bit to 1 disables hardware DMA accesses to the reference

data FIFO (DMA CH7). Clearing this bit allows hardware DMA to the

reference data FIFO. This bit should be set when firmware DMA is to

be carried out to the reference data FIFO.

Bit 7:

Not used

Bit 6:

Enable smart EOL operation.

Setting the smart EOL operation bit causes the posting of an EOL in

the T4 Status register to be delayed until the selected T4Data FIFO

has transferred all of its data. Clearing the bit causes EOL to be set as

soon as the EOL has been processed, regardless of the condition of

the FIFO.

Bit 5:

Enable Non-inverted flush.

Setting the non-inverted flush bit causes the flush operation to use

zero as fill bits rather than the inverted value of the last CW bit.

Inverted fill allows the user to determine the number of fill bits added

to halfword align the last CW.

Bit 4-3:

Compressed data source/destination.

00=T4Data0 (default)

01=T4Data1

10=T4Data2 11=T4Data3

Warning:

No distinction is made between FIFO accesses by either the DMA channel or

the CPU. This means it is possible for both sources to modify the FIFO contents, resulting in

unpredictable operation of the compressor/decompressor. Firmware must ensure that the CPU

does not modify the FIFO contents without first disabling the DMA channel.

Bit 2:

Enable Decompression

Bits 1-0:

T4 Coding/Decoding Mode

00=MH01=MR 1-d

10=MR 2-d11=MMR

When MMR compression is selected, 2-d coding will occur (similar to

MR 2-d), however, the last CW in the line will not be halfword aligned

by adding fill bits. Code words from the next compressed line will be

concatenated to whatever is already in the selected T4Data FIFO.

MMR decompression is similar to MR 2-d decoding, except that the

end-of-line condition is based on the number of decoded bits rather

than an EOL code word.

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