YGV629 Datasheet, PDF (22/26 Pages) YAMAHA CORPORATION – VC1 Video Controller 1

YGV629









ɾRAHZ_N
MA[24:0], MD[15:0], MCE_N,
MOE_N,MWE_N
12
12
RAHZ_N
The AC characteristics of the external memory, which connects to the VC1 must meet the following
conditions. (The following conditions are the value, which are converted from the AC characteristics, and does
not guarantee the following specification directly. And, the following name of the items is for the external
memory connected. And, the following item names are mainly for the external memory connected.)
F in the following formula means the number of the Floating Clock that is set by R#23:FLTIM[1:0], and R
means the number of the Random Access Clock that is set by R#24:RDM[3:0], and P means the number of the
Page Mode Access Clock that is set by R#24:PAG[2:0]. Therefore, if a condition does not meet the following
condition, set so that the register meets the following conditions.
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(max) or lower.
It should be R * t_SYCLK – t_dOE(max) – t_sMD(max) or lower.
It should be P * t_SYCLK – t_dMA(max) – t_sMD(max) 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.
MA24-n
MA(n-1)-0
MOE_N
MWE_N
MD15-0
9
18
10
13
14
16
15
8
7
17
8
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4GV629A50