MFC2000 datasheet(272/426 Pages) ETC

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MFC2000 Multifunctional Peripheral Controller 2000

Hardware Description

14-6

Conexant

100723A

Bit 7:

End of Line Conditions.

For coding, the End-of-line Condition occurs when all data in the line

has been compressed and the last codeword has been written to the

T4Data FIFO.

For decoding, the End-of-line Condition occurs when the decoding of a

line is complete, and all decoded data has been written to the line

buffer. For MH and MR modes, decoding is complete when the EOL

codeword (and Tag bit if in MR mode) have been decoded. For MMR

mode, decoding is complete when the number of bytes specified by

the T4Bytes register have been decoded.

Bit 6:

The Tag bit is only valid when the End-of-line Condition bit is also set.

Bit 5:

The NonConsecutiveEOL/MMREOL is only valid when the End-of-line

Condition bit is also set.

Bit 4:

Line Error.

Line errors apply to the decoding mode only. If a line error occurs

while decoding a line, the T.4 hardware will set the LineError bit.

Decoding will continue until an EOL code is found (MH and MR modes

only), but data decoded following the error will not be output to the line

buffer.. The type of line error can be determined by examing the Line

Error Type bit field.

Bit 3-1:

Line Error Type.

When a line error occurs, the type of line error is placed in this bit field.

The following line errors are detected by the T.4 hardware:

LineError

Code:

Error:

Description:

000b

No error

001b

RTC (Return to

Control) Error

Fill bits occurred between consecutive EOL codewords.

010b

Terminating Code

Error

Codewords for white or black run lengths equal to zero which occur at the

end of a line are missing. When this error occurs the TC error bit (T4Status

ignore these errors if desired.

011b

Reserved

100b

Line Too Short

EOL code found before the number of bytes specified in the T4Bytes

101b

Line Too Long

The number of data bytes decoded before the EOL code is received

exceeds the line length specified in the T4Bytes register.

110b

Code Word Error

An invalid code word was decoded.

111b

Reserved

Bit 0:

Indicate the decoded line is all white when this bit is set. This bit is

reset when the decoding of a line is started.

Notes:

An IRQ is generated whenever any of the shaded bits shown in the T4 Status register

(bits 4, 7–9) and their associated bits in the T4IntMask register are both set.

Bits 0–6, and 9 only apply to decompression mode.

Bits 0–7 are cleared at the start of a new line.

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