Parameter
min
max
units
Notes
t1
t2
t3
PDATA Hi-Z to Command Asserted
nIOR Asserted to PDATA Hi-Z
nWAIT Deasser ted to Command
Deasserted
30
50
180
ns
ns
ns
0
0
60
1
t4
t5
t6
t7
t8
Command Deasserted to PDATA Hi-Z
CommandAsserted to PDATA Valid
PDATA Hi-Z to nWAIT Deasserted
PDATA Valid to nWAIT Deasserted
nIOR Assertd to IOCHRDY Asserted
nWRITE Deasserted to nIOR Asserted
nWAIT Deasserted to IOCHRDY
Deasserted
ns
ns
µs
ns
ns
ns
ns
0
0
0
0
0
24
t9
t10
2
1
0
60
160
t11
t12
IOCHRDY Deasserted to nIOR
Deasserted
nIOR Deasserted to SDATA Hi-Z (Hold
Time)
ns
ns
0
0
40
t13
t14
t15
t16
t17
t18
t19
t20
t21
t22
t25
t28
PDATA Valid to SDATA Valid
nWAIT Asserted to Command Asserted
Time Out
nWAIT Deasserted to PDATA Driven
nWAIT Deasser ted to nWRITE Modified
SDATA Valid to IOCHRDY Deasserted
Ax Valid to nIOR Asserted
75
195
12
190
190
85
ns
ns
µs
ns
ns
ns
ns
ns
ns
ns
ns
ns
0
0
10
60
60
0
40
10
0
40
60
1
1
1,2
3
nIOR Deasserted to Ax Invalid
10
185
nWAIT Asserted to nWRITE Deasserted
nIOR Deasserted to nIOW or nIOR
Asserted
nWAIT Asserted to PDATA Hi-Z
WRITE Deasserted to Command
180
1
1. n WAIT is considered to have settled after it does not transition for a minimum of 50 ns.
2. When not executing a write cycle, EPP nWRITE is inactive high.
3. 85 is true only if t7 = 0.
FIGURE 16B - EPP 1.9 DATA OR ADDRESS READ CYCLE TIMING PARAMETERS
153
SMSC [ SMSC CORPORATION ]
