Parameter
min
max
30
units
ns
Notes
t1
t2
t3
PDATA Hi-Z to Command Asserted
nIOR Asserted to PDATA Hi-Z
nWAIT Deasserted to Command
Deasserted
0
0
60
50
ns
180
ns
1
t4
t5
Command Deasserted to PDATA Hi-Z
Command Asserted to PDATA Valid
PDATA Hi-Z to nWAIT Deasserted
PDATA Valid to nWAIT Deasserted
nIOR Assertd to IOCHRDY Deasserted
nWRITE Deasserted to nIOR Asserted
nWAIT Deasserted to IOCHRDY
Asserted
IOCHRDY Deasserted to nIOR
Asserted
nIOR Deasserted to SDATA Hi-Z (Hold
Time)
ns
ns
µs
ns
ns
ns
ns
0
0
t6
0
t7
0
t8
24
0
t9
2
1
0
t10
160
60
t11
t12
ns
ns
0
0
40
t13
t14
t15
t16
t17
t18
t19
t20
t21
t22
PDATA Valid to SDATA Valid
nWAIT Asserted to Command Asserted
Time Out
75
195
12
190
190
85
ns
ns
µs
ns
ns
ns
ns
ns
ns
ns
0
0
10
60
60
0
nWAIT Deasserted to PDATA Driven
nWAIT Deasserted to nWRITE Modified
SDATA Valid to IOCHRDY Asserted
Ax Valid to nIOR Asserted
1
1,2
3
40
10
0
nIOR Deasserted to Ax Invalid
nWAIT Asserted to nWRITE Deasserted
185
180
nIOR Deasserted to nIOW or nIOR
40
Asserted
60
1
ns
ns
1
nWAIT Asserted to PDATA Hi-Z
WRITE Deasserted to Command
t25
t28
NOTES:
1. nWAIT 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 21 - EPP 1.9 DATA OR ADDRESS READ CYCLE TIMING PARAMETERS
SMSC DS – FDC37N3869
Page 130
Rev. 10/25/2000
SMSC [ SMSC CORPORATION ]
