MFC2000 datasheet(270/426 Pages) ETC

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MFC2000 Multifunctional Peripheral Controller 2000

Hardware Description

14-4

Conexant

100723A

Address

Bit 15

Bit 14

Bit 13

Bit 12

Bit 11

Bit 10

Bit 9

Bit 8

Default

T4 Control

(T4Control)

$01FF8173

(Not Used)

Rst. Value

xxh

Read Value:

00h

Address

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Default

T4 Control

(T4Control)

$01FF8172

Reset T4

Block (w)

Terminating

Code Error

Enable Bi-

level

Resolution

Conversion

Decode

Output

Enable

Vertical OR

enable

(decompress

mode only)

Reset/Halt

Coding or

decoding

Start coding

or decoding

Flush CW

(completes

byte)

Rst. Value

x0000000b

Read Value

00h

Bit 15-8:

Not used

Bit 7:

Writing a 1 to this bit causes the T4 logic to be reset, including all

internal state machines and FIFOs. This bit is useful when switching

between compression and decompression modes.

Bit 6:

A Terminating Code Error is indicated when a run length = 0 code is

expected but not received at the end of a line, and the Terminating

Code Error also sets the Line error bit

Bit 5:

Enable Bi-level Resolution Conversion.

Bi-level resolution conversion is only valid in decompression mode.

When this bit is set, horizontal resolution conversion will be performed

on the decoder output. Both the unconverted line and the converted

line will be output to the line buffer. The converted line will be written

to the line buffer via DMA channel 8.

Bit 4:

Decode output enable.

Decode Output Enable allows decoded data to be output to the line

buffers. This bit should not be set in MH or MR decoding until the first

EOL has been found. The decoder output should also be disabled

after an error line until the next EOL is found. This bit should always

be set for the MMR decoder.

Bit 3:

Vertical OR enable.

The Vertical OR bit is only valid in decompression mode when the bi-

level resolution conversion bit in the T4Config register is also set.

When the Vertical OR bit is set, the resolution converted decoded

output data is ORed with the corresponding byte from the previous line

before storing.

Bit 2:

Reset or halt the coding or decoding.

Setting the Reset/Halt bit immediately halts coding or decoding of a

line, resets all the T4 Status bits, and clears the active T4Data FIFO.

All other bits in this register are ignored if the Reset/Halt bit is set.

When coding or decoding is in progress, writing to any bit in this

Bit 1:

Start coding or decoding.

The Start bit begins the coding or decoding of the line according to the

configuration selected per the T4Config register.

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