Card interface command assertion code table -60, Table 6-26 – Intel PXA255 User Manual
Page 242
6-60
Intel® PXA255 Processor Developer’s Manual
Memory Controller
Table 6-26. Card Interface Command Assertion Code Table
MCMEMx_ASST
MCATTx_ASST
MCIOx_ASST
x_ASST_WAIT
x_ASST_HOLD
x_ASST_WAIT +
x_ASST_HOLD
(nPIOW asserted)
(nPIOR asserted)
(nPIOW asserted)
(nPIOR asserted)
Programmed
Bit Value
Code
decimal
value
# MEMCLKs
(minimum)
to wait before
checking for
nPWAIT=’1’
# MEMCLKs
(minimum)
to assert
command
(nPIOW) after
nPWAIT=’1’
# MEMCLKs
(minimum)
to assert
command
(nPIOR) after
nPWAIT=’1’
# MEMCLKs
(minimum)
command
assertion time
# MEMCLKs
(minimum)
command
assertion time
(Code)
(Code)
(Code + 2)
(2*Code + 3)
(2*Code + 4)
(3*Code + 5)
(3*Code + 6)
00000
0
2
3
4
5
6
00001
1
3
5
6
8
9
00010
2
4
7
8
11
12
00011
3
5
9
10
14
15
00100
4
6
11
12
17
18
00101
5
7
13
14
20
21
00110
6
8
15
16
23
24
00111
7
9
17
18
26
27
01000
8
10
19
20
29
30
01001
9
11
21
22
32
33
01010
10
12
23
24
35
36
01011
11
13
25
26
38
39
01100
12
14
27
28
41
42
01101
13
15
29
30
44
45
01110
14
16
31
32
47
48
01111
15
17
33
34
50
51
10000
16
18
35
36
53
54
10001
17
19
37
38
56
57
10010
18
20
39
40
59
60
10011
19
21
41
42
62
63
10100
20
22
43
44
65
66
10101
21
23
45
46
68
69
10110
22
24
47
48
71
72
10111
23
25
49
50
74
75
11000
24
26
51
52
77
78
11001
25
27
53
54
80
81
11010
26
28
55
56
83
84
11011
27
29
57
58
86
87
11100
28
30
59
60
89
90