Motorola DSP56367 User Manual page 93

Table 3-11 DRAM Page Mode Timings, Three Wait States
No.
131 Page mode cycle time for two consecutive accesses of the same
direction
Page mode cycle time for mixed (read and write) accesses
132 CAS assertion to data valid (read)
133 Column address valid to data valid (read)
134 CAS deassertion to data not valid (read hold time)
135 Last CAS assertion to RAS deassertion
136 Previous CAS deassertion to RAS deassertion
137 CAS assertion pulse width
138
Last CAS deassertion to RAS assertion
• BRW[1:0] = 00
• BRW[1:0] = 01
• BRW[1:0] = 10
• BRW[1:0] = 11
139 CAS deassertion pulse width
140 Column address valid to CAS assertion
141 CAS assertion to column address not valid
142 Last column address valid to RAS deassertion
143 WR deassertion to CAS assertion
144 CAS deassertion to WR assertion
145 CAS assertion to WR deassertion
146 WR assertion pulse width
147 Last WR assertion to RAS deassertion
148 WR assertion to CAS deassertion
149 Data valid to CAS assertion (write)
MOTOROLA
Characteristics
5
DSP56367
External Memory Expansion Port (Port A)
Symbol Expression
2 × T
t
PC C
1.25 × T
2 × T − 7.0
t
CAC C
3 × T − 7.0
t
AA C
t
OFF
2.5 × T − 4.0
t
RSH C
4.5 × T − 4.0
t
RHCP C
2 × T − 4.0
t
CAS C
2.25 × T
t
CRP C
3.75 × T
C
4.75 × T
C
6.75 × T
C
1.5 × T − 4.0
t
CP C
− 4.0
t T
ASC C
2.5 × T − 4.0
t
CAH C
4 × T − 4.0
t
RAL C
1.25 × T
t
RCS C
0.75 × T
t
RCH C
2.25 × T
t
WCH C
3.5 × T − 4.5
t
WP C
3.75 × T
t
RWL C
3.25 × T
t
CWL C
0.5 × T − 4.0
t
DS C
Specifications
Ma
Min Unit
x
40.0 — ns
35.0 —
C
— 13.0 ns
— 23.0 ns
0.0 — ns
21.0 — ns
41.0 — ns
16.0 — ns
− 6.0
— — ns
− 6.0
— — ns
− 6.0
41.5 — ns
− 6.0
61.5 — ns
11.0 — ns
6.0 — ns
21.0 — ns
36.0 — ns
− 4.0
8.5 — ns
− 4.0
3.5 — ns
− 4.2
18.3 — ns
30.5 — ns
− 4.3
33.2 — ns
− 4.3
28.2 — ns
1.0 — ns
3-27