MB86293 Datasheet, PDF (72/285 Pages) Fujitsu Component Limited. – Grraphiics Conttrrollllerr Speciiffiicattiions

FUJITSU LIMITED
PRELIMINARY and CONFIDENTIAL
7.2 D a t a F o r m a t
7.2.1 Data format
The supported data formats are 32-bit single-precision floating-point format, 32-bit fixed-point format,
integer packed format, and RGB packed format. All internal processing is performed in the floating-point
format. For this reason, the integer packed format, fixed-point format, and RGB packed format must be
converted to the floating-point format. The processing speeds in these formats are slightly lower than in
the 32-bit single-precision floating-point format.
The data format to use is selected by setting the GMDR0 register.
(1) 32-bit single-precision floating-point format
31 30
23 22
0
s
e
f
s: Sign bit (1 bit)
e: Exponent part (8 bits)
f: Mantissa (23 bits): ‘1.f’ shows the fraction. ‘1’ is a hidden bit.
The numerical value of the floating-point format becomes (-1)^s(1.f)2^(e-127) (0 < e < 255).
(2) Signed fixed-point format (SFIX16.16)
31 30
16 15
0
s
Int
Frac
s: Sign bit (1 bit)
int: Integer (15 bits)
frac: Fraction (16 bits)
(3) Signed integer packed format (SINT16.SINT16)
31 30
16 15 14
0
s
Y.int
s
X.int
s: Sign bit (1 bit)
int: Integer (15 bits)
(4) RGB packed format
31
24 23
16 15
87
0
reserved
R
G
B
R, G, B: Color bits (8 bits)
(5) ARGB packed format
31
24 23
16 15
87
0
A
R
G
B
A: Alpha bits (8 bits)
R, G, B: Color bits (8 bits)
MB86293 CORAL_LQ
Graphics Controller
72
Specifications Rev. 1.1