MMC-3 Draft Revision 10g
1.1.1.1.1 Block Format for Audio
Audio is streamed, so only ur data resides within the frame. See the READ CD command description for byte ordering.
4.2.3.7.1 Block Format for Mode 0 Data
Mode 0 is a rarely ud format as it is zero filled in the entire ur data area. Mode zero data (Table 9) has the following format.
Table 9 – Mode Zero Data Format
Byte Offt Field Length Content
012Data Block Sync pattern
123Block MSF address (BCD)
151Data mode = 0
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16 2 336Ur data (each byte is zero)
4.2.3.7.2 Block Format for Mode 1 Data
Mode 1 data (Table 10) is most prevalent in CD-ROM applications. The sync pattern, header and ur data are protected by a 32-bit CRC. Two additional layers of error correction, P and Q, collectively called Level 3 correction cover the header and ur data. This is also referred to as Layered error correction (L-EC or C3).
Table 10 – Mode 1 Data Format
Byte Offt Field Length Content
012Data Block Sync pattern
123Block MSF address (BCD)
151Data mode = 01
16 2 048Ur data
20644CRC (P = (X16+X15+X2+X1)*(X16+X2+X+1)) Bytes 0 -
2063
20688Zero fill
2076172P parity symbols
2248104Q parity symbols
The coverage of the CRC is the sync pattern, Header, and the Ur Data.
The coverage of Level 3 P is Header, Ur Data, CRC, and the zero fill.
The coverage of Level 3 Q is Header, Ur Data, CRC, the zero fill, and the P parity.
MMC-3 Draft Revision 10g
4.2.3.7.3 Block Format for Mode 2 Data
Mode 2 data blocks have two types: formless and formed. Mode 2 formed blocks have two forms: form 1 and form 2.
4.2.3.7.3.1 Block Format for Mode 2 formless Data
The Mode 2 formless block format (Table 11) is rarely ud. There is no defined CRC or additional correction.
Table 11 – Mode 2 formless block format哥哥太爱我了怎么办漫画
Byte Offt Field Length Content
012Data Block Sync pattern
123Block MSF address (BCD)坐月子可以吃什么
151Data mode = 2
16 2 336Ur data
4.2.3.7.3.2 Block Format for Mode 2 form 1 Data
The Mode 2 form 1 block format (Table 12) is regularly ud in recorder applications and Video CD movies. The Mode 2 form 1 format is very similar to Mode 1 format. The differences are:
•The 8 zero fill bytes have been moved to between the header and ur data as two copies of a 4 byte sub-header.
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•The CRC, P-parity, and Q-parity do not cover the block header. This assures the ability of relocating data, including all parity symbols.
Table 12 – Mode 2 form 1 data format
Byte Offt Field Length Content
012Data Block Sync pattern
123Block MSF address (BCD)
151Data mode = 2
164Sub-header, first copy
铅笔画漫画人物204Sub-header, cond copy
24 2 048Ur data
20724CRC (P = (X16+X15+X2+X1)*(X16+X2+X+1)) Bytes 16
- 2071
2076172P parity symbols
2248104Q parity symbols
The format of the sub-header is shown in Table 13.
MMC-3 Draft Revision 10g
Table 13 – Mode 2 form 1 sub-header format
算盘的口诀及打法Byte Name Definition
Sub-Header
Byte
0File number Identifies the file to which the block belongs
1Channel number Playback channel lection
2Sub-mode Bit 7: End-of-File
Bit 6: Real-time block
Bit 5: Form (0 = Form 1, 1 = Form 2)
Bit 4: Trigger Block
Bit 3: Data Block
Bit 2: Audio Block (not traditional CD-DA audio)
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Bit 1: Video Block
Bit 0: End-of-Record
3Coding information
4.2.3.7.3.3 Block Format for Mode 2 form 2 Data
Mode 2 form 2 data (Table 14) is regularly ud in Video CD movies. The data is optionally covered by CRC within the last 4 bytes of the block.
Table 14 – Mode 2 form 2 data format
Byte Offt Field Length Content
012Data Block Sync pattern
123Block MSF address (BCD)
151Data mode = 2
非诺贝特胶囊说明书164Sub-header, first copy
204Sub-header, cond copy
24 2 324Ur data
23484Optional CRC Bytes 16 - 2347
4.2.3.8 CD Recordable and CD ReWritable Media Structure
An unrecorded CD-R or CD-RW disc does not have any EFM prent to find the physical track in the traditional way of CD-ROM Logical Units. A blank CD-R or CD-RW is not smooth, it is pre-grooved and the groove has a built-in wobble for the purpo of defining and finding the physical track.
The wobble is a 22.05kHz signal (at 1X) modulated with digital information. The time position within the pre-groove is contained in each pre-groove frame of 42 bits. This is known as Absolute Time In Pre-groove (ATIP) (Table 15).
