YGV638 Datasheet, PDF (19/26 Pages) YAMAHA CORPORATION – a pattern graphic controller with an on-chip VRAM and the ample drawing performance enables high-resolution animated GUIs on WVGA display panels.

■ Electrical Characteristics
● CPU read cycle
PS2-0
CS_N
RD_N
D7-0
WAIT_N
t_sA
tsCS
Hi-Z
Hi-Z
t_onD
t_onWAIT
t_dWAIT
READY_N Hi-Z
t_onWAIT
YGV638
t_hA
thCS
t_offD
t_hD
Hi-Z
t_dD
t_offWAIT
Hi-Z
t_offWAIT
t_dD
t_hREADY
Hi-Z
● CPU write cycle
PS2-0
t_sA
CS_N
tsCS
WR_N
D7-0
WAIT_N
Hi-Z ^tonWAIT
t_dWAIT
READY_N Hi-Z
t_onWAIT
t_hA
thCS
t_sD
t_hD
t_hWR
t_hWR
t_offWAIT
Hi-Z
t_offWAIT
t_hREADY
Hi-Z
● Access cycle
CS_N
WR_N
RD_N
t_aCMD
t_iCMD
tcCMD
t_aCMD
t_iCMD
tcCMD
t_aCMD
t_iCMD
tcCMD
t_aCMD
t_iCMD
tcCMD
4GV638A21
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