Motorola DSP56367 User Manual page 100

Specifications
External Memory Expansion Port (Port A)
Table 3-13 DRAM Out-of-Page and Refresh Timings, Four Wait States
No.
Characteristics
163 RAS assertion pulse width
164 CAS assertion to RAS deassertion
165 RAS assertion to CAS deassertion
166 CAS assertion pulse width
167 RAS assertion to CAS assertion
168 RAS assertion to column address valid
169 CAS deassertion to RAS assertion
170 CAS deassertion pulse width
171 Row address valid to RAS assertion
172 RAS assertion to row address not valid
173 Column address valid to CAS assertion
174 CAS assertion to column address not
valid
175 RAS assertion to column address not
valid
176 Column address valid to RAS
deassertion
177 WR deassertion to CAS assertion
178 CAS deassertion to WR assertion
179 RAS deassertion to WR assertion
180 CAS assertion to WR deassertion
181 RAS assertion to WR deassertion
182 WR assertion pulse width
183 WR assertion to RAS deassertion
184 WR assertion to CAS deassertion
185 Data valid to CAS assertion (write)
186 CAS assertion to data not valid (write)
187 RAS assertion to data not valid (write)
3-34
3
Symbol Expression
3.25 × T
t
RAS
1.75 × T
t
RSH
2.75 × T
t
CSH
1.25 × T
t
CAS
1.5 × T
t
RCD
1.25 × T
t
RAD
2.25 × T
t
CRP
1.75 × T
t
CP
1.75 × T
t
ASR
1.25 × T
t
RAH
0.25 × T
t
ASC
1.75 × T
t
CAH
3.25 × T
t
AR
2 × T
t
RAL
1.5 × T
t
RCS
0.75 × T
t
RCH
0.25 × T
t
RRH
1.5 × T
t
WCH
3 × T
t
WCR
4.5 × T
t
WP
4.75 × T
t
RWL
4.25 × T
t
CWL
2.25 × T
t
DS
1.75 × T
t
DH
3.25 × T
t
DHR
DSP56367
4
20 MHz
Min Max
− 4.0
158.5 —
C
− 4.0
83.5 —
C
− 4.0
133.5 —
C
− 4.0
58.5 —
C
± 2
73.0 77.0
C
± 2
60.5 64.5
C
− 4.0
108.5 —
C
− 4.0
83.5 —
C
− 4.0
83.5 —
C
− 4.0
58.5 —
C
− 4.0
8.5 —
C
− 4.0
83.5 —
C
− 4.0
158.5 —
C
− 4.0
96.0 —
C
− 3.8
71.2 —
C
− 3.7
33.8 —
C
− 3.7
8.8 —
C
− 4.2
70.8 —
C
− 4.2
145.8 —
C
− 4.5
220.5 —
C
− 4.3
233.2 —
C
− 4.3
208.2 —
C
− 4.0
108.5 —
C
− 4.0
83.5 —
C
− 4.0
158.5 —
C
4
30 MHz
Unit
Min Max
104.3 — ns
54.3 — ns
87.7 — ns
37.7 — ns
48.0 52.0 ns
39.7 43.7 ns
71.0 — ns
54.3 — ns
54.3 — ns
37.7 — ns
4.3 — ns
54.3 — ns
104.3 — ns
62.7 — ns
46.2 — ns
21.3 — ns
4.6 — ns
45.8 — ns
95.8 — ns
145.5 — ns
154.0 — ns
137.4 — ns
71.0 — ns
54.3 — ns
104.3 — ns
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