Fujitsu MB86R02 Jade-D Hardware Manual page 402

Graphics controller

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MB86R02 'Jade-D' Hardware Manual V1.64

An example of expressions used for upscaling (i.e. magnification in both vertical and horizontal

directions) is shown below.

Assuming the input picture size is 480x360 and the target display picture size is 640x480, then the

parameters to be used for each register are as follows:

(360/480) × 2048 = 1536 (= filter coefficient of: 0x0600)

Vertical scaling =

Horizontal scaling = (480/640) × 2048 = 1536 (= filter coefficient of: 0x0600)

> Value for the

Values for the

(Capture Magnify Source Size) register:

CMSVL = 0x0168 (= 360 decimal)

CMSHP = 0x00F0 (= 240 decimal)

Values for the

(Capture Magnify Display Size) register:

CMDVL = 0x01E0 (= 480 decimal)

CMDHP = 0x0140 (= 320 decimal)

Value for the L1WW (L1 Layer Window Width) register:

L1WW = 0x0280 (= 640 decimal)

Value for the L1WH (L1 Layer Window Height) register:

L1WH = 0x01DF (= 479 decimal) Note: this value is derived by 'setting value +1' (479 + 1 = 480)

Note: A smooth, continual transition from the downscaling mode to the upscaling mode is not possible

and the image being scaled will be distorted as a result. This is due to the fact that the downscaling

and upscaling pipelines share the same interpolation unit internally (as indicated in the following

diagram taken from an application note for Coral PA).

Note: this value is derived by 480/2 (2-pixel units!)

Note: this value is derived by 640/2 (2-pixel units!)