YGV639 Datasheet, PDF (27/34 Pages) YAMAHA CORPORATION – Video Controller 1 with Enhanced Functions

YGV639
ii) CPU Write Cycle
PS2-0
1
CS_N
3
WR_N
D7-0
WAIT_N
Hi-Z
READY_N Hi-Z
9
10
9
iii) Access Cycle
CS_N
WR_N
RD_N
15
16
17
15
16
17
2
4
12
13
11
Hi-Z
14
11
Hi-Z
15
16
17
15
16
17
27