AN8725FH Datasheet, PDF (30/36 Pages) Panasonic Semiconductor – Semiconductor laser power control IC

AN8725FH
ICs for Optical Disk Drive
s Application Notes (continued)
3. I/O specifications
• Parallel interface
1) I/O level is CMOS.
2) Transfers a digital signal to DAC and each mode setting register with 4 addresses, 8 data and 2 control signals.
Address signal
Data signal
Control signal
AD0 to AD3
DT0 to DT7
XWR, XRD
3) Write can be done at the rise of XWR.
However, selection of a write register can be done at the fall of XWR.
DAC and register data are stored at D-FF.
4) Read appears on DT0 to DT7 at XRD = low.
5) Refer to "s Application Notes, 2. Timing chart" for the timing chart.
6) Each signal line is pulled up and down as below:
Pull-down to GND with 100 kΩ
AD0 to AD3
DT0 to DT7
Pull-up to V_CC with 100 kΩ
XWR
WRD
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