Motorola DSP56367 User Manual page 89

Table 3-9 DRAM Page Mode Timings, One Wait State (Low-Power Apps)
No. Characteristics
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
4
deassertion
• 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 widt
MOTOROLA
Symbol
t
PC
t
CAC
t
AA
t
OFF
0.75 × T
t
RSH
t
RHCP
0.75 × T
t
CAS
1.75 × T
t
CRP
3.25 × T
4.25 × T
6.25 × T
t
CP
t
ASC
0.75 × T
t
CAH
t
RAL
0.75 × T
t
RCS
0.25 × T
t
RCH
t
WCH
h t
WP
DSP56367
External Memory Expansion Port (Port A)
6
20 MHz
Expression
Min Max
2 × T
100.0
C
1.25 × T
62.5
C
− 7.5
T — 42.5
C
1.5 × T − 7.5
— 67.5
C
0.0
− 4.0
33.5
C
2 × T − 4.0
96.0
C
− 4.0
33.5
C
− 6.0
81.5
C
− 6.0
156.5
C
− 6.0
206.5
C
– 6.0 306.5
C
0.5 × T − 4.0
21.0
C
0.5 × T − 4.0
21.0
C
− 4.0
33.5
C
2 × T − 4.0
96.0
C
− 3.8
33.7
C
− 3.7
8.8
C
0.5 × T − 4.2
20.8
C
1.5 × T − 4.5
70.5
C
Specifications
6
30 MHz
Unit
Min Max
— 66.7 — ns
— 41.7 —
— 25.8 ns
— 42.5 ns
— 0.0 — ns
— 21.0 — ns
— 62.7 — ns
— 21.0 — ns
— 52.3 — ns
102.2 — ns
135.5 — ns
— 202.1 — ns
— 12.7 — ns
— 12.7 — ns
— 21.0 — ns
— 62.7 — ns
— 21.2 — ns
— 4.6 — ns
— 12.5 — ns
— 45.5 — ns
3-23