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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