LSI Symbios SYM53C040, Technical Manual

Page: 171 / 214

Microcontroller Interface Timings 9-11
9.4.3 External Data Write Cycle
Figure 9.7 External Data Write Waveforms
Table 9.16 External Data Write Timings
Symbol Parameter Min Max Units
t
13
ALE to WR/ = Minimum delay from ALE falling to WR/
falling 50 – ns
t
14
WR/ pulse width = Minimum time WR/ is low 50 – ns
t
15
Data setup to WR/ = Minimum time data is valid prior to
WR/ rising 50 – ns
t
16
Data hold after WR/ = Minimum time data is valid after WR/
rising 20 – ns
t
6
Address Valid to ALE Falling = Minimum setup time for
A[15:8] and AD[7:0] to ALE falling 20 – ns
t
7
ALE Falling to Lower Address Valid = Maximum delay from
ALE falling to AD[7:0] valid – 10 ns
ALE
PSEN/
WR/
AD[7:0]
A[7:0]
t
14
ADDR
ADDR ADDR
A[15:8]
t
13
t
6
t
7
ADDR ADDR
t
16
DATA
ADDR
t
15