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SPRS230M – OCTOBER 2003 – REVISED MARCH 2011
Table 6-47. Minimum Required Flash/OTP Wait-States at Different Frequencies
SYSCLKOUT
(MHz)
100
75
60
50
30
25
15
4
(1)
SYSCLKOUT (ns)
10
13.33
16.67
20
33.33
40
66.67
250
FLASH PAGE
WAIT-STATE
3
2
2
1
1
0
0
0
FLASH RANDOM
WAIT-STATE
(1)
3
2
2
1
1
1
1
1
OTP WAIT-STATE
5
4
3
2
1
1
1
1
Random wait-state must be greater than or equal to 1.
6.13 ROM Timing (C280x only)
Table 6-48. ROM/OTP Access Timing
PARAMETER
t
a(rp)
t
a(rr)
t
a(ROM)
(1)
Paged ROM access time
Random ROM access time
ROM (OTP area) access time
(1)
MIN
19
19
60
TYP
MAX
UNIT
ns
ns
ns
In C280x devices, a 1K X 16 ROM block replaces the OTP block found in Flash devices.
Equations to compute the page wait-state and random wait-state in
are as follows:
ROM Page Wait-State
+
t
a(rp)
t
c(SCO)
t
a(rr)
t
c(SCO)
*
1
(round up to the next highest integer) or 0, whichever is larger
ROM Random Wait-State
+
*
1 (round up to the next highest integer) or 1, whichever is larger
Table 6-49. ROM/ROM (OTP area) Minimum Required
Wait-States at Different Frequencies
SYSCLKOUT
(MHz)
100
75
50
30
25
15
4
(1)
SYSCLKOUT
(ns)
10
13.33
20
33.33
40
66.67
250
PAGE
WAIT-STATE
1
1
0
0
0
0
0
RANDOM
WAIT-STATE
(1)
1
1
1
1
1
1
1
Random wait-state must be greater than or equal to 1.
Copyright © 2003–2011, Texas Instruments Incorporated
Electrical Specifications
133
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