Analog Devices AD9854 User Manual page 35

A<5:0> A1
D<7:0> D1
RD
t
RDHOZ
t
AHD
SPECIFICATION
t
ADV
t
AHD
t
RDLOV
t
RDHOZ
A<5:0> A1
D<7:0> D1
WR
t
WRHIGH
SPECIFICATION
t
ASU
t
DSU
t
ADH
t
DHD
t
WRLOW
t
WRHIGH
t
WR
A2
D2
t
RDLOV
t
ADV
VALUE DESCRIPTION
15ns ADDRESS TO DATA VALID TIME (MAXIMUM)
5ns ADDRESS HOLD TIME TO RD SIGNAL INACTIVE (MINIMUM)
15ns RD LOW TO OUTPUT VALID (MAXIMUM)
10ns RD HIGH TO DATA THREE-STATE (MAXIMUM)
Figure 52. Parallel Port Read Timing Diagram
t
WR
A2
t
ASU
t
DSU
t
WRLOW
VALUE DESCRIPTION
8.0ns
ADDRESS SETUP TIME TO WR SIGNAL ACTIVE
3.0ns
DATA SETUP TIME TO WR SIGNAL ACTIVE
0ns
ADDRESS HOLD TIME TO WR SIGNAL INACTIVE
0ns DATA HOLD TIME TO WR SIGNAL INACTIVE
WR SIGNAL MINIMUM LOW TIME
2.5ns
7ns WR SIGNAL MINIMUM HIGH TIME
MINIMUM WRITE TIME
10.5ns
Figure 53. Parallel Port Write Timing Diagram
Rev. E | Page 35 of 52
D2
t
AHD
t
DHD
AD9854
A3
D3
A3
D3