DVD-RAM 2.6G, 4.7G have CAPA(Complementary Allocated Pit Address) differnt from DVD-ROM.
CAPA is consist of same pit like DVD-ROM disk,that’s why even blank disk has it.
CAPA has PID(Physical ID) which shows address on disk.
DVD-RAM 2.6G,4.7G use (REDiF, IDGATE, DTRD, VFOSHORT) signal to read PID.
This signal is not used in DVD-ROM and CD-ROM.
- RFDiF signal :
This signal is made from main 4D(main beam) in IC101 and sent to IC201.
This signal is used of generation of IDGATE,DTRD, VFOSHORT signal in IC201.
This signal is used to control PLL frequency for seek.
- IDGATE signal:
This signal is made by RFDiF signal and PLL clock in IC201.
IDGATE signal detect CAPA and input “H” to IC101.
IDGATE signal is changed to RF signal of slicer of IC201 in IC101.
When IDGATE signal is “H”, it feed into IC101 47, 48 pin and CD offset is removed (For
up to readability) and RF signal of CAPA is sent to IC201 slicer. When IDGATE is “L”, it
feed into IC101 47, 48 pin and user data RF signal is sent to IC201 slicer.
- DTRD signal :
This signal is made by RFDiF signal and PLL clock in IC201.
This signal is used for read of PID read and user data read timing in IC201.
DTRD signal is sent to IC101 and used for hold of RFAGC. When DTRD signal is “L”
and IDGATE is “L”, RFAGC is held.
- VFOSHORT signal : This signal is made by RFDiF signal and PLL clock in IC201.
VFOSHORT signal is “H” in front of CAPA and user data, RF signal is shorted and
remove DC offset to read PID of CAPA and user data.
29
x2
VGA
MUX
52
47
48
46
51
50
49
F1
F2
E2
RFP
E1
x2
x1
x1
RFP
IC101
IC201
34
98
93
91
RFDIF
ARF
Only
Seek
EQ
31
99
NARF
DTRD
IDGATE
VFOSHORT
30
IDGATE
Generator
DTRD
Generator
VFOSHORT
Generator
Comparator
PLL
SLICER
Decoder
80
124 123
35
5
10
9
DVD-RAM 2.6G, 4.7G system
