lpc47s457-ns Standard Microsystems Corp., lpc47s457-ns Datasheet - Page 247

• Manufacturer Part Number: lpc47s457-ns
• Description: Advanced I/o With X-bus Interface
• Manufacturer: Standard Microsystems Corp.

11.9 X-Bus Timing
Note: The following timing values are based on a 33MHz PCI clock. Timing values will vary with variations in the PCI
clock frequency.
11.9.1 TIMING FOR LPC INITIATED I/O CYCLES WITH THE X-BUS
Note: Cases A-D for t2 correspond to the different pulse width options for the X-Bus read strobe. See the X-Bus
Selection Configuration Register.
Note: Cases A-D for t2 correspond to the different pulse width options for the X-Bus write strobe. See the X-Bus
Selection Configuration Register.
SMSC LPC47S45x
t1
t2
t3
t4
t5
NAME
NAME
t1
t2
t4
t5
t3
Ax, nXCSx
nXWR
Data
nXCS active to nXWR active
nXWR active to nXWR inactive
nXWR inactive to nXCS inactive
Data valid to nXWR active
nXWR inactive to data invalid
nXCS active to nXRD active
nXRD active to nXRD inactive
nXRD inactive to nxCS inactive
Data valid to nXRD inactive
nXRD inactive to data invalid
Ax, nXCSx
nXRD
Data
DESCRIPTION
DESCRIPTION
FIGURE 39 − X-BUS WRITE TIMING
FIGURE 38 − X-BUS READ TIMING
DATASHEET
Page 247 of 259
t1
t1
t4
t2
t4
Valid
A: 180
B: 300
C: 420
D: 540
t2
Valid
A: 180
B: 300
C: 420
D: 540
MIN
100
MIN
20
100
40
40
22
45
0
t3
t5
TYP
TYP
t3
t5
MAX
MAX
190
190
UNITS
UNITS
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Rev. 08-10-09