YGV639 Datasheet, PDF (30/34 Pages) YAMAHA CORPORATION – Video Controller 1 with Enhanced Functions

iii) RAHZ_N
MA25-0,MD15-0
MOE_N,MWE_N
12
RAHZ_N
YGV639
12
Note: The AC characteristics of an external memory connecting to VC1E must meet the following
conditions.
(The following conditions are the values converted from the AC characteristics of the VC1E pattern
memory; they do not guarantee the following specifications directly. In addition, the item names
below are those mainly for an externally-connected memory.)
“F”, “R”, and “P” in the below are as follows.
● F =(R#2:FLTIM[1:0]+1) Number of Floating Clocks
● R =(R#3:RDM[3:0]+1)
Number of Random Access Clocks,
● P =(R#3:PAG[2:0]+1)
Number of Page Mode Access Clocks
No.
Items
13 Address, Access Time
14 Output Enable Time
15 Page Mode Access Time
16 Data Turn On Time
17 Data Turn Off Time
18 Data Setup Time
Conditions
It should be (F + R) * t_SYCLK – t_dMA(max) – t_sMD(min) or lower
It should be R * t_SYCLK – t_dOE(max) – t_sMD(min) or lower
It should be P * t_SYCLK – t_dMA(max) – t_sMD(min) or lower
It should be 0[ns] or over
It should be F * t_SYCLK - t_dOE(max) + t_dWE(min) or lower
It should be R * t_SYCLK - t_dMD(max) + t_dWE(min) or lower
SYCLK
MA25-n
MA(n-1)-0
MOE_N
MWE_N
MD15-0
F
R
tdMA(max)
tdOE(max)
tdWE(max)
18
10
13
14
16
P
tdMA(max)
15
tdMA(max)
tdMA(max)
7
tsMD(min)
8
17
tsMD(min)
8
SYCLK
MA25-n
MA(n-1)-0
MOE_N
MWE_N
MD15-0
F
tdMA(max)
R
tdMA(max)
tdOE(max)
tdWE(max)
tdMD(max)
tdWE(max)
18
10
30