MCM20027IBBL View Datasheet(PDF) - Motorola => Freescale

Part Name

Description

Manufacturer

MCM20027IBBL

Color SXGA Digital Image Sensor 1280 x 1024 pixel progressive scan solid state image sensor with integrated CDS/PGA/ADC, digital programming, control, timing, and pixel correction features

Motorola => Freescale 

MOTOROLA

SEMICONDUCTOR TECHNICAL DATA

ImageMOS

6.0 Frame Rate and Integration Time Control

In addition to the minimum time required to readout the

selected resolution and WOI, the user has the ability to

control the frame rates while operating in either Contin-

uous Frame Rolling Shutter capture mode (CFRS) and

Single Frame Rolling Shutter (SFRS).

The frame rate can be defined as the time required to

readout an entire frame of data plus the required bound-

ary timing. This is done by varying the size of a number

of parameters identified in later sections, the main one

being the Virtual Frame surrounding the WOI.

Please refer to Figure 11 for a pictorial description of the

Virtual Frame and its relationship to the WOI

.

0

0

WOI Pointer (wcp,wrp)

Window of Interest (WOI)

vcw[13:0]

6.2 Integration Time in CFRS mode:

In Continuous Frame Rolling Shutter capture mode, the

Integration time is defined as:

Integration Time=Tint = (cintd + 1) * Trow

where cintd is the number of virtual row times desired

for integration time. Therefore, the integration time in

CFRS mode can be adjusted in steps of virtual frame

row times.The user controls cintd via the Integration

Time MSB Register, (Table 42), on page 54 and Inte-

gration Time LSB Register, (Table 43), on page 55.

Row Time (Trow) is the length of time required to read

one row of the virtual frame and can be defined as:

Trow = (vcwd + shsd + shrd + 19) * MCLKperiod

where vcwd defines the number of columns in the virtu-

al frame and shsd and shrd are internal timing control

registers.

The user controls vcwd via the CFRS Virtual Frame

Column Width registers (Table 46 on page 56 and Table

47 on page 56).

The user controls the shsd and shrd values via the In-

ternal Timing Control Register 1 (shs time definition);

Table 52 and Table 53, “Internal Timing Control Regis-

ter 2 (shr time definition),” on page 60.

WOI Column Width (wcw)

vrd[13:0]

Virtual Frame

Figure 11. Virtual Frame Definition

NOTE!! In Continuous Frame Rolling Shutter

(CFRS) capture mode, the Integration time upper

limit is bounded by the Frame time (see “CFRS

Frame Time/Rate:” on page 13).

6.1 CFRS Frame Time/Rate:

In Continuous Frame Rolling Shutter capture mode, the

Frame time is completely defined by the size of the Vir-

tual Frame and can be expressed as:

Frame Time = Tframe = (vrdd + 1) * Trow

where vrdd defines the number of rows in the virtual

frame. The user controls vrdd via the Virtual Frame Row

Depth registers (Table 44 on page 55 and Table 45 on

page 55).

Frame Rate = (Frame time)-1

i.e.. Tint < Tframe

Revision 8.4 - 24 Oct 2002: MCM20027

MOTOROLA

13

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