EP7212 Datasheet, PDF (99/136 Pages) Cirrus Logic – HIGH-PERFORMANCE, LOW-POWER SYSTEM-ON-CHIP WITH LCD CONTROLLER AND DIGITAL AUDIO INTERFACE(DAI)

EP7212
Symbol
Parameter
13 MHz
18/36 MHz
Min
Max
Min
Max
t39 SSIRXDA data hold time
40
40
t40 SSITXFR and / or SSIRXFR period
750
750
NOTE: All DRAM 36 MHz timings are for EDO DRAM operation.
The values for 36 MHz include 1 wait state, the 18 MHz values have 0 wait states.
Table 58. AC Timing Characteristics (cont.)
Symbol
Characteristics
13 MHz
18 MHz
36 MHz
Min Max Min Max Min Max
t_nCSRD Negative strobe (nCS[0:5]) zero
120
70
35
wait state read access time
t_nCSWR Negative strobe (nCS[0:5]) zero
120
70
35
wait state write access time
t_EXBST Sequential expansion burst mode
55
35
35
read access time
t_RC
DRAM cycle time
230 -
150
-
150
t_RAC Access time from RAS
110 -
70
-
50
t_RP
RAS precharge time
110 -
70
-
50
t_CAS CAS pulse width
30
-
20
-
10
t_CP
CAS precharge in page mode
20
-
12
-
10
t_PC
Page mode cycle time
70
-
45
-
20
t_CSR CAS set-up time for auto refresh
20
-
15
-
5
t_RAS RAS pulse width
110 -
80
-
50
NOTE: All DRAM 36 MHz timings are for EDO DRAM operation.
The values for 36 MHz include 1 wait state, the 18 MHz values have 0 wait
states.
Table 59. Timing Characteristics
Units
ns
ns
Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
DS474PP1
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