Card Interface Command Assertion Code Table - Intel PXA255 Developer's Manual

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