Motorola DSP56367 User Manual page 105

Table 3-15 DRAM Out-of-Page and Refresh Timings, Eleven Wait States
No.
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)
188 WR assertion to CAS assertion
189 CAS assertion to RAS assertion (refresh)
190 RAS deassertion to CAS assertion (refresh)
191 RD assertion to RAS deassertion
192 RD assertion to data valid
193
RD deassertion to data not valid
194 WR assertion to data active
195 WR deassertion to data high impedance
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. The asynchronous delays specified in the expressions are valid for DSP56367.
4. RD deassertion will always occur after CAS deassertion; therefore, the restricted timing is t
and not t
GZ
5. Either t
RCH
Table 3-16 DRAM Out-of-Page and Refresh Timings, Fifteen Wait States
No.
Characteristics
157 Random read or write cycle time
158 RAS assertion to data valid (read)
159 CAS assertion to data valid (read)
160 Column address valid to data valid (read)
MOTOROLA
4
Characteristics
4
.
or t must be satisfied for read cycles.
RRH
3
DSP56367
External Memory Expansion Port (Port A)
Symbol
Expression
11.75 × T
t
RWL
10.25 × T
t
CWL
5.75 × T
t
DS
5.25 × T
t
DH
7.75 × T
t
DHR
6.5 × T
t
WCS C
1.5 × T
t
CSR C
2.75 × T
t
RPC
11.5 × T
t
ROH
t
GA
10 × T
C
t
GZ
0.75 × T
0.25 × T
Symbol Expression
16 × T
t
RC C
8.25 × T − 5.7
t
RAC C
4.75 × T − 5.7
t
CAC C
5.5 × T − 5.7
t
AA C
Specifications
3
Min Max
− 4.3
113.2 —
C
− 4.3
103.2 —
C
− 4.0
53.5 —
C
− 4.0
48.5 —
C
− 4.0
73.5 —
C
− 4.3
60.7 —
− 4.0
11.0 —
− 4.0
23.5 —
C
− 4.0
111.0 —
C
— 93.0
− 7.0
0.0 —
− 0.3
7.2 —
C
— 2.5
C
Uni
Min Max
133.3 — ns
— 63.0 ns
— 33.9 ns
— 40.1 ns
3-39
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
OFF
t