AC TIMING
Host Timing
t3
t5
AX,
AEN,
nIOCS16
t1
t6
t2
nIOR
t4
DATA
(D0-D7)
DATA VALID
PD0-PD7, nERR,
PE, SLCT, nACK,
BUSY
t7
FINTR
nIOR/nIOW
PINTR
t8
t9
PINTR is the interrupt assigned to the Parallel Port
FINTR is the interrupt assigned to the Floppy Disk
Parameter
min
typ
max
units
t1
40
ns
A0-A9, AEN, nIOCS16 Set Up to
nIOR Low
t2
t3
nIOR Width
150
10
ns
ns
A0-A9, AEN, nIOCS16 Hold from
nIOR High
Data Access Time from nIOR Low
Data to Float Delay from nIOR High
Parallel Port Setup
t4
t5
t6
t7
t8
100
60
ns
ns
ns
ns
ns
10
20
40
Read Strobe to Clear FINTR
55
nIOR or nIOW Inactive for Transfers to
150
and from ECP FIFO
t9
260
ns
nIOR Active to PINTR Inactive
FIGURE 8 - MICROPROCESSOR READ TIMING
SMSC DS – FDC37N3869
Page 117
Rev. 10/25/2000
SMSC [ SMSC CORPORATION ]
