AC Electrical Characteristics
Electrical Characteristics 19-9

Figure 19-6. DRAM Read Cycle 16-Bit Access (CPU Bus Master) Timing Diagram

Table 19-8. DRAM Read Cycle 16-Bit Access (CPU Bus Master) Timing Parameters

Number Characteristic (3.0 ± 0.3)V Unit
Minimum Maximum
1 Row address valid to RASx asserted 40 —ns
2DWE
negated before row address valid 0 ns
3OE
asserted before RASx is asserted 0 ns
4 RASx asserted before row address invalid
(MSW= 0,1) 12,27 — ns
5 Column address va lid to CASx asserted
(MSW= 0,1) 10,25 — ns
6 RASx asserted to CASx asserted
(MSW= 0,1) 28,58 32 ns
7 RASx pulse width (SLW =0,1) 90,120 ns
8 CASx pulse width (BC[1:0]= 00,01,10,11) 28,58,88,118 ns
9 CASx asserted to data-in valid
(BC[1:0]= 00,01,10,11 for FPM) 15,45,75,105 (FPM)
20 (EDO) ns
10 Data-in hold after CASx is negated 0 (FPM)
30 (EDO) —ns
11 OE negated after CASx is negated 0 (FPM)
30 (EDO) 35 ns
MD[12:0]
RASx
CASx
DWE
D[15:0]
14
5
12
6 8 13
7
3
2
11
910
OE
ColumnRow Row
14