MN66279RSC Datasheet, PDF (19/96 Pages) Panasonic Semiconductor – LSI FOR COMPACT DISC/CD ROM PLAYER

MN662790RSC
7-1 (2) Initialization
After clearing RST, the system waits for a data write command (DTMS) and SYS command.
1) After clearing RST, execute the data write command first.
The data write command is composed of the following three bytes, which is different from the regular
format (see page 22).
̙15 ̙14 ̙13 ̙12 ̙11 ̙10 ̙9 ̙8
̙7 ̙6 ̙5 ̙4 ̙3 ̙2 ̙1 ̙0
̗7 ̗6 ̗5 ̗4 ̗3 ̗2 ̗1 ̗0
̨̩̌̚ʹʷʷʷʷɹʷʷʷ̍ʢ̗ʣ
̨̫̩̚ʹʷʷʷʷɹʷʷʷʷʢ̗ʣ
̢̨̙̩ʹ̍̍̍̍ɹ̌̌̍̌ʢ̗ʣ
That is, SET0 (various system settings) data is stored in the upper 8 bits of the 16-bit data, and VSET
(anti-vibration mode selection) data is stored in the lower 8 bits.ɹɹɹɹɹ
2) After the data write command (DTMS) is processed, the SENSE signal (WTEND) is set to "L" and it is
in the standby status for the SYS command.
Unlike conventional models, no system settings are possible with the SYS command. This is due to the
expansion of the DTMS/DTSM functions. Execute the following command, however, after checking that
the SENSE signal is set to "L". This is for the protocol assurance of the SENSE signal with the
mechanical controller.
When the SYS command MDATA 1111 0101 is accepted, the SENSE signal is set to "H" and processing
of the SYS command starts. When the processing completes, the SENSE signal is set to "L" to enter the
normal operation loop.
Table 7-1-2 indicates the default values of system setting. The default value of each item is changeable
with the DTMS command.
Note)
If the data write command (DTMS) is not executed within 743 ms after starting the standby status for the
data write command (DTMS) and the SYS command, the system setting is performed with the default
value and enters the normal operation loop.
Be aware that initial SET0 data and VSET data are written in a special format that is entirely different
from the format used for writing usual data. In initial setting, SET0 and VSET are set at the same time
only by sending a 3-byte command once, while in normal write, SET0 and VSET are set separately using
a 3-byte command.
Timing chart is shown in Figure 7-1-3.
SDD00025AEM
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