User`s manual

7: A.C. CHARACTERISTICS
S1D13504 SERIES HARDWARE FUNCTIONAL EPSON 1-63
SPECIFICATION (X19A-A-002-17)
7.4.14 External RAMDAC Read / Write Timing
Figure 7-46 Generic Bus RAMDAC Read / Write Timing
Table 7-35 Generic Bus RAMDAC Read / Write Timing
Symbol Parameter Min. Typ. Max. Units
TBCLK Bus clock period 30 ns
t1
AB[20:0], CS#, M/R# delay to DACRS[1:0] 10 ns
t2
DACRS[1:0] hold from AB[20:0], CS#, M/R# negated 10 ns
t3
Valid RD# command to DACRS[1:0] delay 8 33 ns
t4
DACRD# hold from valid RD# command negated 3 14 ns
t5
Valid WR# command to DACWR# delay 2 TBCLK ns
t6
DACWR# pulse width low 2.45 TBCLK 2.55 TBCLK ns
AB[20:0]
Valid RD# command
t1
DACRS[1:0]
t5
Write
t3
t4
DACRD#
t2
DACWR#
t6
Valid WR# command
Read
CS#
M/R#
(depends on CPU bus)
(depends on CPU bus)