3-26
DSP56367
MOTOROLA
Specifications
External Memory Expansion Port (Port A)
145
CAS assertion to WR
deassertion
t
WCH
1.5
×
T
C
−
4.2
18.5
—
14.6
—
ns
146
WR assertion pulse width
t
WP
2.5
×
T
C
−
4.5
33.5
—
26.8
—
ns
147
Last WR assertion to RAS
deassertion
t
RWL
2.75
×
T
C
−
4.3
33.4
—
26.8
—
ns
148
WR assertion to CAS
deassertion
t
CWL
2.5
×
T
C
−
4.3
33.6
—
27.0
—
ns
149
Data valid to CAS assertion
(write)
t
DS
0.25
×
T
C
−
3.7
0.1
—
—
—
ns
0.25
×
T
C
−
3.0
—
—
0.1
—
ns
150
CAS assertion to data not valid
(write)
t
DH
1.75
×
T
C
−
4.0
22.5
—
17.9
—
ns
151
WR assertion to CAS assertion
t
WCS
T
C
−
4.3
10.9
—
8.2
—
ns
152
Last RD assertion to RAS
deassertion
t
ROH
2.5
×
T
C
−
4.0
33.9
—
27.3
—
ns
153
RD assertion to data valid
t
GA
1.75
×
T
C
−
7.5
—
19.0
—
—
ns
1.75
×
T
C
−
6.5
—
—
—
15.4
ns
154
RD deassertion to data not
valid
6
t
GZ
0.0
—
0.0
—
ns
155
WR assertion to data active
0.75
×
T
C
−
0.3
11.1
—
9.1
—
ns
156
WR deassertion to data high
impedance
0.25
×
T
C
—
3.8
—
3.1
ns
Note:
1.
The number of wait states for Page mode access is specified in the DCR.
2.
The refresh period is specified in the DCR.
3.
The asynchronous delays specified in the expressions are valid for DSP56367.
4.
All the timings are calculated for the worst case. Some of the timings are better for specific
cases (e.g., t
PC
equals 3
×
T
C
for read-after-read or write-after-write sequences).
5.
BRW[1:0] (DRAM Control Register bits) defines the number of wait states that should be
inserted in each DRAM out-of-page access.
6.
RD deassertion will always occur after CAS deassertion; therefore, the restricted timing is t
OFF
and not t
GZ.
7.
There are no DRAMs fast enough to fit to two wait states Page mode @ 100MHz (See
Figure 3-11)
Table 3-10 DRAM Page Mode Timings, Two Wait States (Continued)
No.
Characteristics
Symbol
Expression
66 MHz
80 MHz
Unit
Min Max
Min
Max
Содержание DSP56367
Страница 16: ...xvi MOTOROLA CONTENTS Paragraph Number Title Page Number ...
Страница 22: ...xxii MOTOROLA List of Figures Figure Number Title Page Number ...
Страница 26: ...xxvi MOTOROLA List of Tables Table Number Title Page Number ...
Страница 148: ...4 6 DSP56367 MOTOROLA Design Considerations PLL Performance Issues ...
Страница 248: ...9 30 DSP56367 MOTOROLA Serial Host Interface SHI Programming Considerations ...
Страница 306: ...10 58 DSP56367 MOTOROLA Enhanced Serial Audio Interface ESAI ESAI Initialization Examples ...
Страница 389: ...Bootstrap ROM Contents MOTOROLA DSP56367 A 15 end ...
Страница 390: ...A 16 DSP56367 MOTOROLA Bootstrap ROM Contents ...
Страница 432: ...C 8 DSP56367 MOTOROLA JTAG BSDL ...
Страница 484: ...D 52 DSP56367 MOTOROLA Programmer s Reference ...
Страница 490: ...E 6 DSP56367 MOTOROLA Power Consumption Benchmark ...
Страница 516: ...F 26 DSP56367 MOTOROLA IBIS Model ...
Страница 522: ...Index 6 MOTOROLA Index ...
Страница 523: ......