TABLE 93 - EPP 1.9 DATA OR ADDRESS READ CYCLE TIMING
NAME
DESCRIPTION
PDATA Hi-Z to Command Asserted
nIOR Asserted to PDATA Hi-Z
nWAIT Deasserted to Command Deasserted
(Note 1)
MIN
0
0
TYP
MAX
30
50
UNITS
ns
ns
t1
t2
t3
60
180
ns
t4
t5
t6
t7
t8
Command Deasserted to PDATA Hi-Z
Command Asserted to PDATA Valid
PDATA Hi-Z to nWAIT Deasserted
PDATA Valid to nWAIT Deasserted
nIOR Asserted to IOCHRDY Asserted
nWRITE Deasserted to nIOR Asserted (Note 2)
nWAIT Deasserted to IOCHRDY Deasserted
(Note 1)
0
0
0
0
0
ns
ns
μs
ns
ns
ns
ns
24
t9
t10
0
60
160
t11
t12
t13
t14
t15
t16
t17
t18
t19
t20
t21
t22
t23
t24
t25
t26
t27
t28
IOCHRDY Deasserted to nIOR Deasserted
nIOR Deasserted to SDATA Hi-Z (Hold Time)
PDATA Valid to SDATA Valid
nWAIT Asserted to Command Asserted
Time Out
nWAIT Deasserted to PDATA Driven (Note 1)
nWAIT Deasserted to nWRITE Modified (Notes 1,2)
SDATA Valid to IOCHRDY Deasserted (Note 3)
Ax Valid to nIOR Asserted
0
0
0
ns
ns
ns
ns
μs
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
40
75
195
12
190
190
85
0
10
60
60
0
40
10
0
40
60
0
60
0
nIOR Deasserted to Ax Invalid
10
185
nWAIT Asserted to nWRITE Deasserted
nIOR Deasserted to nIOW or nIOR Asserted
nWAIT Asserted to PDIR Set (Note 1)
PDATA Hi-Z to PDIR Set
nWAIT Asserted to PDATA Hi-Z (Note 1)
PDIR Set to Command
185
180
20
180
nWAIT Deasserted to PDIR Low (Note 1)
nWRITE Deasserted to Command
60
1
Note 1: nWAIT is considered to have settled after it does not transition for a minimum of 50 ns.
Note 2: When not executing a write cycle, EPP nWRITE is inactive high.
Note 3: 85 is true only if t7 = 0.
224
SMSC [ SMSC CORPORATION ]
