Siemens SPC3 manual Synchronous Motorola-Mode, Processor-Write-Timing

PROFIBUS Interface Center SPC3

Synchronous Motorola-Mode, Processor-Write-Timing
	40
E_Clock
41		42
AB(10..0)	VALID
	50	51
DB(7..0)	Da ta Va lid
46		47
R_W
48		49
XCS
		AS = log.'1'

8.5.5 Timing in the Asynchronous Motorola-Mode (for example, 68HC16) :

In the asynchronous Motorola mode, the SPC3 acts like memory with Ready logic, whereby the access times depend on the type of accesses.

The request for an access of SPC3 is generated from the positive edge of the AS signal (in addition: XCS=´0´, R_W=´1´). The request for a write accessi generated from the positive edge of the AS signal (in addition: XCS=´0´, R_W=´0´).

AMI-Vers.

No. Parameter Min Max

ST-Vers.
Min	Max	Unit

60

61

62

63

64

65

66

67

68

69

70

71

72

73

74

75

76

77

78

79

Address-Setuptime to AS ↓

AS ↓ to Data valid (Zugriff auf RAM)

AS ↓ to Data valid (Zugriff auf die Register)

Address (AB10..0) Holdtime after AS − R_W ↓ Setuptime to AS ↓ AS-Puls-Width (Read)

Data Holdtime after AS −

AS-Inactive-Time

R_W Holdtime after AS −

XCS ↓ Setuptime to AS ↓

XCS Holdtime after AS −

AS ↓ to XDSACK ↓ (Read, Normal Ready) AS ↓ to XDSACK ↓ (Read, Early Ready) XDSACK-Holdtime after AS −

AS Cycletime

Data Setuptime to AS − Data Holdtime after AS − AS-Pulse-Width (Write) * last AS ￿ (Read) to XCS ￿ XCS ￿ to next AS ￿ (Write)

AS ￿ to next AS ￿ (Write, XCS don’t care)

0

10

10

6T - 10

2

10

10 -5 0

4T + 5

3T + 5

4.3

6T

10

10

4T

4T + 10

2T + 10

6T

4T + 5

(88,3)

4T + 18

(101,3)

6.3

5T + 14

4T + 14

12.7

0		ns
	3T + 45.2	ns
	(108)
	4T + 22.9	ns
	(106,2)
10		ns
10		ns
6T − 10		ns
4	12	ns
10		ns
10		ns
-5		ns
0		ns
	5T + 16	ns
	4T + 16	ns
6	22	ns
6T		ns
10		ns
10		ns
4T		ns
4T + 10		ns
2T + 10		ns
6T		ns

Explanations:

Page 52	V1.3	SPC3 Hardware Description
2003/04		Copyright (C) Siemens AG 2003. All rights reserved.