Motorola DSP56367 User Manual page 107

Table 3-16 DRAM Out-of-Page and Refresh Timings, Fifteen Wait States
No.
Characteristics
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. RD deassertion will always occur after CAS deassertion; therefore, the restricted timing is
t and not t
OFF
4. Either t
RCH
MOTOROLA
3
Symbol
t
t
t
t
t
3
.
GZ
or t must be satisfied for read cycles.
RRH
DSP56367
External Memory Expansion Port (Port A)
Expression
6.25 × T − 4.0
t
DH C
9.75 × T − 4.0
DHR C
9.5 × T − 4.3
WCS C
1.5 × T − 4.0
CSR C
4.75 × T − 4.0
RPC C
15.5 × T − 4.0
ROH C
14 × T − 5.7
t
GA C
t
GZ
0.75 × T − 0.3
C
0.25 × T
C
Specifications
Uni
Min Max
t
48.1 — ns
77.2 — ns
74.9 — ns
8.5 — ns
35.6 — ns
125.2 — ns
— 111.0 ns
0.0 — ns
5.9 — ns
— 2.1 ns
3-41