SWITCHING WAVEFORMS: SYSTEM BUS INTERFACE
t
HIGH
2.4 V
2.0 V
2.0 V
1.5 V
t
LOW
0.4 V
CLK
1.5 V
0.8 V
0.8 V
t
CYC
22206B-60
Figure 57. CLK Waveform for 5 V Signaling
t
HIGH
0.6 V
DD_PCI
0.5 V
0.4 V
0.5 V
0.4 V
DD_PCI
DD_PCI
DD_PCI
DD_PCI
t
LOW
CLK
0.3 V
0.3 V
DD_PCI
DD_PCI
0.2 V
DD_PCI
t
CYC
22206B-61
Figure 58. CLK Waveform for 3.3 V Signaling
Tx
Tx
CLK
t
t
H
SU
AD[31:00], C/BE[3:0],
PAR, FRAME, IRDY,
TRDY, STOP,
DEVSEL, IDSEL
t
t
SU(GNT)
H(GNT)
GNT
22206B-62
Figure 59. Input Setup and Hold Timing
Am79C978
229