Bus Operation-Dram Accesses Ac Timing Specifications - Motorola MC68306 User Manual

8.10 BUS OPERATION—DRAM ACCESSES AC TIMING
SPECIFICATIONS
Num.
71 CLKOUT High to RAS≈ Asserted (0 Wait State Operation)
71A AS Asserted to RAS≈ Asserted (0 Wait State Operation)
72 CLKOUT Low to RAS≈ Asserted (1 Wait State Operation)
73 CLKOUT Low to Row Address Valid
74 Row Address Valid to RAS≈ Asserted
75 RAS≈ Asserted to Row Address Invalid
76 CLKOUT High to Row Address Invalid (0 Wait State Operation)
77 CLKOUT Low to Row Address Invalid (1 Wait State Operation)
78 RAS≈ Width Asserted (Non-Page Mode)
79 RAS≈ Width Asserted (Page Mode)
80 RAS≈ Width Negated (Back to Back Cycles)
81 RAS≈ Asserted to CAS≈ Asserted
82 CLKOUT High to Column Address Valid (0 Wait State Operation)
CLKOUT Low to Column Address Valid (1 Wait State Operation)
83
84 CLKOUT Low to CAS≈ Asserted (0 Wait State Operation)
85 CLKOUT High to CAS≈ Asserted (1 Wait State Operation)
86 Column Address Valid to CAS≈ Asserted
87 CAS≈ Asserted to Column Address Invalid
88 CAS≈ Width Asserted
89 CLKOUT Low to RAS≈ /CAS≈ Negated
89A AS Negated to RAS≈ /CAS≈ Negated
90 CAS≈ Width Negated (Back to Back Cycles)
91 CAS≈ Width Negated (Page Mode
92 UDS/LDS Asserted to CAS≈ Asserted
93 DRAMW Low to CAS≈ Asserted (Write)
94 Data Out Valid to CAS≈ Asserted (Write)
95 CLKOUT Low to CAS≈ Asserted (Refresh Cycle)
96 CLKOUT High to CAS≈ Negated (Refresh Cycle)
97 CAS≈ Width Asserted (Refresh Cycle)
98 CAS≈ Asserted to RAS≈ Asserted (Refresh Cycle)
99 CLKOUT High to RAS≈ Asserted (Refresh Cycle)
100 CLKOUT Low to RAS≈ Negated (Refresh Cycle)
101 RAS≈ Width Asserted (Refresh Cycle)
102 DRAMW High to RAS≈ Asserted (Refresh Cycle)
103 DRAMW High Hold After RAS≈ Asserted (Refresh Cycle)
NOTES:
1. On write portion of TAS, CAS assertion is gated by UDS/LDS (not CLKOUT as in all other operation).
2. Page mode is used on Read-Modify-Write (TAS instruction) cycles only.
8-12
(The electrical specifications in this document are preliminary. See Figures 8-8–8-11)
Characteristic
2
)
1
(Page Mode
MC68306 USER'S MANUAL
0-Wait
Min
0
0
–
0
15
20
0
–
120
480
60
45
0
–
0
–
20
75
60
0
0
150
240
2
) 0
30
15
0
0
80
20
0
0
80
20
20
16.67 MHz
1-Wait
Max Min Max
30 – –
10 – –
– 0 25
30 0 30
– 30 –
– 40 –
– – –
– 0 –
180 150 210
540 510 570
– 90 –
– 60 –
30 – –
– 0 30
20 – –
– 0 20
– 20 –
– 100 –
90 90 120
30 0 30
10 0 10
– 180 –
300 240 300
10 0 10
– 60 –
– 45 –
20 0 20
20 0 20
120 140 180
60 20 60
30 0 30
25 0 25
120 140 180
60 20 60
– 20 –
MOTOROLA
Unit
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