參數(shù)資料
型號： ZR36060PQC
廠商： Electronic Theatre Controls, Inc.
元件分類： Codec
英文描述： Integrated JPEG CODEC
中文描述： 綜合JPEG編解碼器
文件頁數(shù)： 32/46頁
文件大小： 307K
代理商： ZR36060PQC
30
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
0x00E
0x00F
0x0010
7
6
5
4
3
2
1
0
TCV_DATA[31:24]
TCV_DATA[23:16]
TCV_DATA[15:8]
TCV_DATA[7:0]
R/W
X
default
type
0x011
0x012
7
6
5
4
3
2
1
0
SF[15:8] (integer part of SF)
SF[7:0] (fractional part of SF)
R/W
X
default
type
0x013
0x014
0x015
7
6
5
4
3
2
1
0
AF[23:16]
AF[15:8]
AF[7:0]
R/W
X
default
type
0x016
0x017
0x018
0x019
7
6
5
4
ACV[31:24]
ACV[23:16]
ACV[15:8]
ACV[7:0]
3
2
1
0
R
X
default
type
0x01A
0x01B
0x01C
0x01D
7
6
5
4
ACT[31:24]
ACT[23:16]
ACT[15:8]
ACT[7:0]
3
2
1
0
R
X
default
type
0x01E
0x01F
0x020
0x021
7
6
5
4
3
2
1
0
ACV_TRUN[31:24]
ACV_TRUN[23:16]
ACV_TRUN[15:8]
ACV_TRUN[7:0]
R
X
default
type
0x022
type
7
6
5
4
3
2
1
0
DeviceID
R
1
0
default
0
1
0
0
1
1
0x023
type
Revision
R
0
default
0
0
0
0
0
0
1
0x024
0x025
7
6
5
4
3
2
1
0
0
0
–
X
default
type
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