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ZR36050

JPEG IMAGE COMPRESSION PROCESSOR

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ADVANCE INFORMATION

ZR36050

MODE Register

This register selects the operating Mode of the device. Refer to

Tables 4, 5, 7, 8.

COMP

ATP

PASS2

TLM DC Only BRC

0

0

Figure 28. MODE Register

MBCV Register

This parameter specifies the Maximum Block Code Volume.

When Bit Rate Control is used, MBCV limits the maximum

number of bits that will be used to encode each block.

The number of bits is twice the value coded in the 8 bit MBCV

register. MBCV=01 represents two bits, and MBCV=FF repre-

sents 510 bits.

OPTIONS Register

Used only in Encoding modes. The fields of this register select

the Overflow detection option, and set the number of scans to be

encoded in compression by setting the OVF and NSCN bits

respectively. When OVF bit is set, the ZR36050 selects the

overflow option. Refer to Tables 4, 5, 6, 7, 8.

MARKERS_EN Register

In encoding, this register specifies which of the marker segments

to include in the compressed data. Marker segments are APP,

COM, DRI, DNL, DQT and DHT. The DQTI and DHTI fields of

this register are also used in Table Preload for encoding and

decoding, to specify which tables to preload.

NSCN NSCN NSCN

OVF

0

0

0

0

Figure 29. OPTIONS Register

APP

COM

DRI

DQT

DHT

DNL

DQTI

DHTI

Figure 30. MARKERS_EN Register

Table 3. Programming the ZR36050 Bus Interfaces For Compressed Data Transfer

Data Transfer Mode

BSWD

MSTR

DMA

Master mode

0

1

0

Slave mode with 8-bit compressed data bus

0

0

0

Slave mode with 16-bit compressed data bus

1

0

0

DMA mode with 8-bit compressed data bus

0

0

1

DMA mode with 16-bit compressed data bus

1

0

1

CFIS

0-7

0

0

0

0

BELE

x

x

0/1

x

0/1

Table 4. Programming the ZR36050 for Encoding Modes

Encoding Mode

COMP

ATP

JPEG Baseline Compression Pass

1

0

Auto Bit Rate Control

1

1

Statistical Pass

1

0

Compression Pass with Bit Rate Control

1

0

Tables-only Pass

1

0

Tables Preload for Encoding

1

0

PASS2

1

0

0

1

1

0

TLM

0

0

0

0

1

1

DC Only

0

0

0

0

0

0

BRC

0

1

1

1

0

0

NSCN

0-7

0-7

0-7

0-7

0

0

OVF

0/1

0/1

0

0/1

0

0

Table 5. Programming the ZR36050 for JPEG Lossless Encoding Mode

JPEG Lossless Encoding Mode

COMP

ATP

PASS2

TLM

DC Only

BRC

NSCN

OVF

JPEG Lossless Compression Pass

1

0

1

0

0

0

0-7

0

29

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