Parallel Port EPP Timing
t18
t9
AX
SD<7:0>
t17
t8
t12
t19
nIOW
t10
t11
IOCH RDY
t13
t20
t2
t5
nWRITE
t1
PD<7:0>
t16
t3
t14
t4
nDATAST
n ADD RSTB
t15
t6
t7
nWAIT
Parameter
mi n
max
units
Notes
t1
t2
nIOW As sert ed to PD ATA Valid
nW AIT As se rt ed to n W RITE Ch an g e
nWR ITE to C ommandA sserted
nWAIT Deasserted to Command Deasserted
nWAI T Ass erted to PDATA Invalid
Time Out
Command Deasserted to nWAIT A sserted
SDATA Valid to IOWA sserted
nIOW D eass erted to DATA Invalid
nI OW Ass erted to IOC HRDY Deasserted
WAIT Deasserted to nIOCHRDY A sserted
IOCHR DY D eass erted to nIOW A sserted
nI OW As sert ed to nWR ITE A sserted
nWA IT Ass er t ed to C omma n d A sse r te d
Command Asserted to nWAIT Deasserted
PDATA Valid to C ommandA sserted
Ax Valid to nIOW A sserted
0
60
5
50
185
35
ns
ns
ns
ns
ns
µs
ns
ns
ns
ns
ns
ns
ns
ns
µs
ns
ns
ns
ns
ns
1
t3
t4
60
0
190
1
1
t5
t6
10
0
12
t7
t8
10
0
t9
t10
t11
t12
t13
t14
t15
t16
t17
t18
t19
t20
0
24
160
60
10
0
1
1
70
210
10
60
0
10
40
10
40
60
nIOW D eass erted to Ax Invalid
nIOW Deas sert ed to nIOW or nIOR A sserted
nWAI T Ass erted to nWRITE As sert ed
185
1
NOTE: WAIT mustbe filtered to compensate for ringing on the parallel bus cable. WAIT is consideredto have settled
after it does notFtrIaGnsUitiRonEfo1r 9a m- iEniPmuPm1o.f950DnAseTcA. OR ADDRESS WRITE CYCLE
SMSC DS – FDC37N3869
Page 128
Rev. 10/25/2000
SMSC [ SMSC CORPORATION ]
