DSP56366 Technical Data, Rev. 3.1
Freescale Semiconductor
3-29
193 RD deassertion to data not valid
4
t
GZ
0.0
0.0
—
0.0
—
ns
194 WR assertion to data active
0.75
×
T
C
0.3
11.1
—
9.1
—
ns
195 WR deassertion to data high impedance
0.25
×
T
C
—
3.8
—
3.1
ns
1
The number of wait states for out-of-page access is specified in the DCR.
2
The refresh period is specified in the DCR.
3
RD deassertion will always occur after CAS deassertion; therefore, the restricted timing is t
OFF
and not t
GZ
.
4
The asynchronous delays specified in the expressions are valid for DSP56366.
5
Either t
RCH
or t
RRH
must be satisfied for read cycles.
Table 3-15 DRAM Out-of-Page and Refresh Timings, Eleven Wait States
1, 2
No.
Characteristics
3
Symbol
Expression
4
Min
Max
Unit
157
Random read or write cycle time
t
RC
12
×
T
C
120.0
—
ns
158
RAS assertion to data valid (read)
t
RAC
6.25
×
T
C
7.0
—
55.5
ns
159
CAS assertion to data valid (read)
t
CAC
3.75
×
T
C
7.0
—
30.5
ns
160
Column address valid to data valid (read)
t
AA
4.5
×
T
C
7.0
—
38.0
ns
161
CAS deassertion to data not valid (read hold time)
t
OFF
0.0
—
ns
162
RAS deassertion to RAS assertion
t
RP
4.25
×
T
C
4.0
38.5
—
ns
163
RAS assertion pulse width
t
RAS
7.75
×
T
C
4.0
73.5
—
ns
164
CAS assertion to RAS deassertion
t
RSH
5.25
×
T
C
4.0
48.5
—
ns
165
RAS assertion to CAS deassertion
t
CSH
6.25
×
T
C
4.0
58.5
—
ns
166
CAS assertion pulse width
t
CAS
3.75
×
T
C
4.0
33.5
—
ns
167
RAS assertion to CAS assertion
t
RCD
2.5
×
T
C
±
4.0
21.0
29.0
ns
168
RAS assertion to column address valid
t
RAD
1.75
×
T
C
±
4.0
13.5
21.5
ns
169
CAS deassertion to RAS assertion
t
CRP
5.75
×
T
C
4.0
53.5
—
ns
170
CAS deassertion pulse width
t
CP
4.25
×
T
C
4.0
38.5
—
ns
171
Row address valid to RAS assertion
t
ASR
4.25
×
T
C
4.0
38.5
—
ns
172
RAS assertion to row address not valid
t
RAH
1.75
×
T
C
4.0
13.5
—
ns
173
Column address valid to CAS assertion
t
ASC
0.75
×
T
C
4.0
3.5
—
ns
Table 3-14 DRAM Out-of-Page and Refresh Timings, Eight Wait States
1, 2
(continued)
No.
Characteristics
3
Symbol
Expression
4
66 MHz
80 MHz
Unit
Min
Max
Min
Max