Specifications

30 Issue Date: 2004/11/05 │ CONFIDENTIAL
CL765 │ Camera Application Processor
Datasheet │ Doc. #: CLQP-DS-743
4.2. HOST INTERFACE
Figure 4-2 shows the generic interconnection between the host (modem CPU) and
the CL765. The interface used for mainly two types of interactions, register
read/write and LCD access. For register read/write, the interface is called
“Index/Data Port”, while for LCD access, the interface is called “LCD Access Port”.
Figure 4-2. Modem CPU Interface
The pins used in the interconnection are:
M_CLK: CL765’s Main System Input CLOCK
M_RESET_N: Pin used for resetting the CL765. Generally, it is the best to
reset the IC after modem CPU gets stabilized. It gets connected to RES_OUT
pin of the modem CPU, but it can also be connected to POR (Power-On-
Reset) pin.
M_CS_N: CS pin is for controlling the CL765 main LCD. Since the CL765
directly controls LCD, it is the most efficient to use chip select for the existing
LCD space. Needless to say, the chip select pin of other areas of LCD can also
be used.
MS_CS_N: The chip selection pin is for the CL765 to control sub-LCD. Here,
the sub LCD should support the same interface as main LCD in order for the
CL765 to be able to control it. In case of not using sub-LCD for display, this
pin should be connected High.
M_WR_N: Write Enable signal that Modem CPU passes to the CL765. For
LCD Bypass, this used as LCD Write Enable signal.
M_RD_N: Read Enable signal that Modem CPU passes to the CL765.
M_SD[17:0]: Modem CPU Data Bus, corresponds to LCD Data (L_DA[17:0])
for LCD Bypass.
M_SA[1:0]: Modem CPU Address Bus, 2bit is assigned because Indirect
Address Access is used in the CL765.
M_RESET_N