HD6417606 RENESAS [Renesas Technology Corp], HD6417606 Datasheet - Page 355

• Manufacturer Part Number: HD6417606
• Manufacturer: RENESAS [Renesas Technology Corp]

13.9
When the power supply of an external device interfacing with the HIF is cut off, intermediate
levels may be applied to the HIF input pins or the HIF output pins may drive an external device
not powered, thus causing the device to be damaged. The HIFEBL pin is provided to prevent this
from happening. The system power monitor block controls the HIFEBL pin in synchronization
with the cutoff of the external device power so that all HIF pins can be set to the high-impedance
state. Figure 13.12 shows an image of high-impedance control of the HIF pins. Table 13.6 lists the
input/output control for the HIF pins.
Figure 13.12 Image of High-Impedance Control of HIF Pins by HIFEBL Pin
Interface When External Device Power is Cut Off
HIFD15 to HIFD00
HIFDREQ
HIFRDY
HIFEBL
HIFWR
HIFMD
HIFINT
HIFRD
HIFCS
HIFRS
Rev. 4.00 Sep. 13, 2007 Page 329 of 502
Section 13 Host Interface (HIF)
REJ09B0239-0400