HD66781 Datasheet, PDF (155/196 Pages) Renesas Technology Corp – 720-channel Source Driver for a-Si TFT/Low Temperature Poly-Si TFT Panels with 262,144-color display RAM

HD66781
Preliminary
High-Speed RAM Write with Window Address Function
Specifying a window-address range (minimum range: 8 words x 1 word) enables consecutive high-speed
RAM data write in an arbitrary rectangular area on RAM.
In the high-speed write mode, data must be written to RAM by horizontal lines. If RAM write is
terminated in the middle of the line, there is no guarantee that data are properly written on that line.
The following figure illustrates an example of high-speed RAM write in the window-address range on
RAM.
By setting the window address specifying bits (HSA = 8’h10, HEA = 8’h2F, VSA = 9’h020, VEA =
9’h05F), data are written consecutively in high speed in the window-address range specified by these bits.
Write in the horizontal direction
AM = 0, I D0 = 1
Wi ndow addr ess-r ange set t ing
HA S = 8’h12, HE A = 8'hA8
VSA = 9’h020, VEA = 9'h05F
H i gh-speed RAM w r i t e mode
setting HW M = 1
Addr ess set
AD = 18’h02010*
RAM w r i t e x 150 x 60 times
* Note: Make an address set within the window address
00000h
GRAM addr ess map
18’h02012
Wi ndow addr ess-r ange
(overwritten area)
18’h05BA7
Wi ndow addr ess-r ange set t ing
HA S = 8’h10, HE A = 8’h2F
VSA = 9’h020, VEA = 9’h05F
10F83h
Rev.0.5, July.31.2003, page 155 of 196