Spc3 profibus interface center – Siemens SPC3 User Manual
Page 55
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SPC3
PROFIBUS Interface Center
SPC3 Hardware Description
V1.3
Page 53
Copyright (C) Siemens AG 2003 All rights reserved.
2003/04
T
=
Pulse cycle (48MHz)
TBD
=
To Be Defined
(1
=
Access to the RAM
(2
=
Access to the register/latches
(3
=
For T = 48MHz
Asynchronous Motorola-Mode, Processor-Read-Timing
AS
VALID
Data Out
AB(10..0)
DB(7..0)
R_W
E_Clock = log.'0'
63
70
62
65
61
64
XDSACK
(normal)
XDSACK
(early)
67
72
60
71
66
73
69
XCS
68
77
Asynchronous Motorola-Mode, Processor-Write-Timing
AS
VALID
AB(10..0)
DB(7..0)
E_Clock = log.'0'
63
62
75
76
74
Data In
R_W
XDSACK
(normal)
67
72
70
60
66
69
XCS
68
71
73
XDSACK
(early)
78
79
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