Parameter
min
max
units
Notes
t1
t2
t3
PDATA Hi-Z to Command Asserted
nIOR Asserted to PDATA Hi-Z
nWAIT Deasserted to Command
Deasserted
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 Asserted
nWRITE Deasserted to nIOR Asserted
nWAIT Deasserted to IOCHRDY
Deasserted
30
50
ns
ns
ns
0
0
180
1
60
t4
t5
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
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 Deasserted 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
nWAIT Asserted to nWRITE Deasserted
10
185
nIOR Deasserted to nIOW or nIOR
Asserted
180
1
nWAIT Asserted to PDATA Hi-Z
WRITE Deasserted to Command
NOTES:
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 11 - EPP 1.9 DATA OR ADDRESS READ CYCLE TIMING PARAMETERS
SMSC DS – SP37E760
Page 69
Rev. 04/13/2001
SMSC [ SMSC CORPORATION ]
