Siemens SIMATIC NET SPC 4-2 LF Manual page 144

t 1 Setup time AB before XRD ↓ and
XCS ↓ active
Hold time AB after XWR ↑
t 2
t 3 XCS, XRD ↓ until DB low resistance
t 4 XCS, XRD ↑ until DB high resistance
t 5 Access time of XRD ↓ until data valid
t 6 XCS, XRD ↓ until XREADY ↓ (early)
t 7 XCS, XRD ↑ until XREADY ↑ (early,
normal)
t 8 XCS, XRD ↓ until XREADY ↓ (normal)
t 9 Pulse width XWR
t 10 Hold time XCS after XWR ↑
t 11 Setup time DB before XWR ↑
t 12 Hold time DB after XWR ↑
t 13 XWR until XREADY (early, normal)
t 14 Setup time AB before XWR ↑
Table 11-8: Bus Interface Timing Intel Synchronous
Times in brackets apply for 3.3 V. For write timing, note the information in Section
11.3.
144
Min. Max.
20 (30)
0
18 (27)
18 (27)
T + 52 (77)
SPC 4-2
0 T + 18 (27)
SPC 4-2
0 17 (26)
T 2 T + 18 (27)
SPC 4-2 SPC 4-2
10
0
10 (15)
5 (8)
0 16 (24)
20 (30)
PROFIBUS Controller SPC 4®-2 LF
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
C79000-G8976-C157-3