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CXD3068Q
[2] Subcode Interface
There are two methods for reading out a subcode externally.
The 8-bit subcodes P to W can be read out from SBSO by inputting EXCK.
Sub-Q can be read out after checking CRC of the 80 bits in the subcode frame.
Sub-Q can be read out from the SQSO pin by inputting 80 clock pulses to the SQCK pin when SCOR comes
correctly and CRCF is high.
§ 2-1. P to W Subcode Readout
Data can be read out by inputting EXCK immediately after WFCK falls. (See Timing Chart 2-1.)
§ 2-2. 80-bit Sub-Q Readout
Fig. 2-2 shows the peripheral block of the 80-bit Sub-Q register.
• First, Sub-Q, regenerated at one bit per frame, is input to the 80-bit serial/parallel register and the CRC check
circuit.
• 96-bit Sub-Q is input, and if the CRC is OK, it is output to SQSO with CRCF = 1. In addition, 80 bits are
loaded into the parallel/serial register.
When SQSO goes high after SCOR is output, the CPU determines that new data (which passed the CRC
check) has been loaded.
• When the 80-bit data is loaded, the order of the MSB and LSB is inverted within each byte. As a result,
although the sequence of the bytes is the same, the bits within the bytes are now ordered LSB first.
• Once the 80-bit data load is confirmed, SQCK is input so that the data can be read.
The SQCK input is detected, and the retriggerable monostable multivibrator is reset while the input is low.
• The retriggerable monostable multivibrator has a time constant from 270 to 400µs. When the duration when
SQCK is high is less than this time constant, the monostable multivibrator is kept reset; during this interval,
the serial/parallel register is not loaded into the parallel/serial register.
• While the monostable multivibrator is being reset, data cannot be loaded in the peak detection parallel/serial
register or the 80-bit parallel/serial register.
In other words, while reading out with a clock cycle shorter than this time constant, the register will not be
rewritten by CRCOK and others.
• The previously mentioned peak detection register can be connected to the shift-in of the 80-bit parallel/serial
register.
For ring control 1, input and output are shorted during peak meter and level meter modes.
For ring control 2, input and output are shorted during peak meter mode.
This is because the register is reset with each readout in level meter mode, and to prevent readout
destruction in peak meter mode.
As a result, the 96-bit clock must be input in peak meter mode.
• The absolute time after peak is stored in the memory in peak meter mode. (See Timing Chart 2-3.)
• The high and low intervals for SQCK should be between 750ns and 120µs.
Summary of Contents for PV420S
Page 1: ...SERVICE MANUAL PV420S WWW BBK RU ...
Page 72: ... 69 CXD3068Q Block Diagram ...
Page 73: ... 70 CXD3068Q Pin Configuration ...
Page 122: ... 119 CXD3068Q Timing Chart 1 3 ...
Page 123: ... 120 CXD3068Q Timing Chart 1 4 ...
Page 124: ... 121 CXD3068Q Timing Chart 1 5 ...
Page 129: ... 126 CXD3068Q Timing Chart 2 1 ...
Page 130: ... 127 CXD3068Q Block Diagram 2 2 ...
Page 131: ... 128 CXD3068Q Timing Chart 2 3 ...
Page 134: ... 131 CXD3068Q Timing Chart 2 6 ...
Page 138: ... 135 CXD3068Q VCO C Mode Fig 3 3 Access Flow Chart Using VCO Control ...
Page 140: ... 137 CXD3068Q Block Diagram 4 1 ...
Page 143: ... 140 CXD3068Q Timing Chart 4 4 ...
Page 147: ... 144 CXD3068Q Fig 4 6 a Auto Focus Flow Chart Fig 4 6 b Auto Focus Timing Chart ...
Page 148: ... 145 CXD3068Q Fig 4 7 a 1 Track Jump Flow Chart Fig 4 7 b 1 Track Jump Timing Chart ...
Page 149: ... 146 CXD3068Q Fig 4 8 a 10 Track Jump Flow Chart Fig 4 8 b 10 Track Jump Timing Chart ...
Page 150: ... 147 CXD3068Q Fig 4 9 a 2N Track Jump Flow Chart Fig 4 9 b 2N Track Jump Timing Chart ...
Page 151: ... 148 CXD3068Q Fig 4 10 a Fine Search Flow Chart Fig 4 10 b Fine Search Timing Chart ...
Page 152: ... 149 CXD3068Q Fig 4 11 a M Track Move Flow Chart Fig 4 11 b M Track Move Timing Chart ...
Page 157: ... 154 CXD3068Q Fig 4 15 CD TEXT Data Timing Chart ...
Page 162: ... 159 CXD3068Q Fig 5 3a Fig 5 3b ...
Page 196: ... 193 CXD3068Q Description of Data Readout ...
Page 200: ... 197 CXD3068Q ...
Page 201: ... 198 CXD3068Q ...
Page 202: ... 199 CXD3068Q ...
Page 207: ... 204 CXD3068Q Package Outline Unit mm ...
Page 208: ...This data sheet has been made from recycled paper to help protect the environment 205 ...
