Specifications
External Memory Expansion Port (Port A)
MOTOROLA
DSP56367
3-35
188
WR assertion to CAS assertion
t
WCS
3
×
T
C
−
4.3
145.7
—
95.7
—
ns
189
CAS assertion to RAS assertion
(refresh)
t
CSR
0.5
×
T
C
−
4.0
21.0
—
12.7
—
ns
190
RAS deassertion to CAS assertion
(refresh)
t
RPC
1.25
×
T
C
−
4.0
58.5
—
37.7
—
ns
191
RD assertion to RAS deassertion
t
ROH
4.5
×
T
C
−
4.0
221.0
—
146.0
—
ns
192
RD assertion to data valid
t
GA
4
×
T
C
−
7.5
—
192.5
—
125.8
ns
193
RD deassertion to data not valid
3
t
GZ
0.0
—
0.0
—
ns
194
WR assertion to data active
0.75
×
T
C
−
0.3
37.2
—
24.7
—
ns
195
WR deassertion to data high
impedance
0.25
×
T
C
—
12.5
—
8.3
ns
Note:
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.
Reduced DSP clock speed allows use of DRAM out-of-page access with four Wait states (See
Figure 2-17
.).
Table 3-14 DRAM Out-of-Page and Refresh Timings, Eight Wait States
No.
Characteristics
4
Symbol
Expression
3
66 MHz
80 MHz
Unit
Min Max
Min
Max
157
Random read or write cycle time
t
RC
9
×
T
C
136.4
—
112.5
—
ns
158
RAS assertion to data valid (read)
t
RAC
4.75
×
T
C
−
7.5
—
64.5
—
—
ns
4.75
×
T
C
−
6.5
—
—
—
52.9
ns
159
CAS assertion to data valid (read)
t
CAC
2.25
×
T
C
−
7.5
—
26.6
—
—
ns
2.25
×
T
C
−
6.5
—
—
—
21.6
ns
160
Column address valid to data valid
(read)
t
AA
3
×
T
C
−
7.5
—
40.0
—
—
ns
3
×
T
C
−
6.5
—
—
—
31.0
ns
Table 3-13 DRAM Out-of-Page and Refresh Timings, Four Wait States
No.
Characteristics
3
Symbol
Expression
20 MHz
4
30 MHz
4
Unit
Min Max
Min Max
Summary of Contents for DSP56367
Page 16: ...xvi MOTOROLA CONTENTS Paragraph Number Title Page Number ...
Page 22: ...xxii MOTOROLA List of Figures Figure Number Title Page Number ...
Page 26: ...xxvi MOTOROLA List of Tables Table Number Title Page Number ...
Page 148: ...4 6 DSP56367 MOTOROLA Design Considerations PLL Performance Issues ...
Page 248: ...9 30 DSP56367 MOTOROLA Serial Host Interface SHI Programming Considerations ...
Page 306: ...10 58 DSP56367 MOTOROLA Enhanced Serial Audio Interface ESAI ESAI Initialization Examples ...
Page 389: ...Bootstrap ROM Contents MOTOROLA DSP56367 A 15 end ...
Page 390: ...A 16 DSP56367 MOTOROLA Bootstrap ROM Contents ...
Page 432: ...C 8 DSP56367 MOTOROLA JTAG BSDL ...
Page 484: ...D 52 DSP56367 MOTOROLA Programmer s Reference ...
Page 490: ...E 6 DSP56367 MOTOROLA Power Consumption Benchmark ...
Page 516: ...F 26 DSP56367 MOTOROLA IBIS Model ...
Page 522: ...Index 6 MOTOROLA Index ...
Page 523: ......