Motorola DSP56367 User Manual page 103

Table 3-14 DRAM Out-of-Page and Refresh Timings, Eight Wait States
No.
Characteristics
182 WR assertion pulse width
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
MOTOROLA
4
Symbol
t
WP
t
RWL
t
CWL
t
DS
t
DH
t
DHR
t
WCS
t
CSR
t
RPC
t
ROH
t
GA
4 t
GZ
.
or t must be satisfied for read cycles.
RRH
DSP56367
External Memory Expansion Port (Port A)
66 MHz
3
Expression
Min
8.5 × T − 4.5
124.3
C
8.75 × T − 4.3
128.3
C
7.75 × T − 4.3
113.1
C
4.75 × T − 4.0
68.0
C
3.25 × T − 4.0
45.2
C
5.75 × T − 4.0
83.1
C
5.5 × T − 4.3
79.0
C
1.5 × T − 4.0
18.7
C
1.75 × T − 4.0
22.5
C
8.5 × T − 4.0
124.8
C
7.5 × T − 7.5
—
C
7.5 × T − 6.5
—
C
0.0 0.0
0.75 × T − 0.3
11.1
C
0.25 × T
—
C
Specifications
80 MHz
Max Min Max
— 101.8 —
— 105.1 —
— 92.6 —
— 55.4 —
— 36.6 —
— 67.9 —
— 64.5 —
— 14.8 —
— 17.9 —
— 102.3 —
106.1 — —
— — 87.3
— 0.0 —
— 9.1 —
3.8 — 3.1
3-37
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
OFF