ZR36060PQC datasheet(32/46 Pages) ETC

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Integrated JPEG CODEC

Target Data Code Volume Register

Address 0x00D - 0x010

TCV_DATA[31:0]: Target Data Code Volume. Used only in Auto Two-Pass (1st.

pass) and Statistical Pass. TCV_DATA is used by the ZR36060 to calculate the

new Scale Factor (SF) and Allocation Factor (AF) after the Statistical Pass. It is the

Target Code Volume in bits for the compressed data excluding the marker seg-

ments, the EOB (end-of-block) Huffman codes, the byte stuffing, and the bit stuffing

(which completes the last data byte). Byte stuffing typically represents about 1% of

the code volume.

Scale Factor Registers

Address 0x011 - 0x012

SF[15:0]: Scale Factor. It is used for scaling the quantization table values. SF

should be provided to the ZR36060 as a parameter at the beginning of every com-

pression operation. If Variable SF option is used, this register is internally

computed and updated at the end of every compression pass in order to converge

to the desired TCV. SF is a 16-bit fixed point binary number, with 8-bits after the

binary point.

Allocation Factor Registers

Address 0x013 - 0x015

AF[23:0]: Allocation Factor. AF is used to compute the Allocated Code Volume for

each block. The AF is computed by the ZR36060 and written to the AF register at

the end of the Statistical Pass. This value can later be used in a Compression Pass;

otherwise for Compression Pass without prior statistics, AF must be programmed

to 0xFFFFFF prior to the compression. AF is a 24-bit fixed point binary number,

with 19-bits after the binary point.

Accumulated Code Volume Registers

Address 0x016 - 0x019

ACV[31:0]: Accumulated Code Volume. It is a 32-bit fixed point binary number.

ACV register is used in 2 ways depending on the compression pass:

(1)

ACV_DATA: To store the Net Code Volume in bits unit excluding marker

segments, EOB codes and bit and byte stuffing at the completion of the Sta-

tistical Pass.

(2)

ACV_NET: To store the Net Code Volume in bits excluding marker

segments at the completion of every Compression Pass.

ACV_NET / 8 = number of bytes passed through the Code FIFO excluding marker

segments. It does not include the padding bytes for double-word alignment.

Accumulated Total Activity Registers

Address 0x01A - 0x01D

ACT[31:0]: Accumulated Total Activity of the image, used for ZR36060 internal

calculations. ACT is updated at the end of Statistical Pass and Auto two-pass com-

pression modes. It is a 32-bit fixed point binary number.

Accumulated Truncated Bits Registers

Address 0x01E - 0x021

ACV_TRUN[31:0]: Total number of truncated bits of the frame as a result of block

truncation in Compression Pass and Auto Two-Pass modes. ACV_TRUN is

updated at the end of these modes. It is a 32-bit fixed point binary number.

8.2 ID and Testing Registers

Identification Registers (Read Only)

Address 0x022 - 0x023

DeviceID: Hardwired to the chip device ID number (0x33).

Revision: Hardwired to the current chip revision number (0x01).

Test Control Registers

Address 0x024 - 0x025

Reserved: Reserved for test mode. Must be initialized to 0x00 for correct

operation.

0x00D

TCV_DATA[31:24]

R/W

default

type

0x00E

TCV_DATA[23:16]

0x00F

TCV_DATA[15:8]

0x0010

TCV_DATA[7:0]

0x011

SF[15:8] (integer part of SF)

R/W

default

type

0x012

SF[7:0] (fractional part of SF)

0x013

AF[23:16]

R/W

default

type

0x014

AF[15:8]

0x015

AF[7:0]

0x016

ACV[31:24]

default

type

0x017

ACV[23:16]

0x018

ACV[15:8]

0x019

ACV[7:0]

0x01A

ACT[31:24]

default

type

0x01B

ACT[23:16]

0x01C

ACT[15:8]

0x01D

ACT[7:0]

0x01E

ACV_TRUN[31:24]

default

type

0x01F

ACV_TRUN[23:16]

0x020

ACV_TRUN[15:8]

0x021

ACV_TRUN[7:0]

0x022

DeviceID

default

type

0x023

Revision

default

type

0x024

–

default

type

0x025

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