TIMING DIAGRAMS
t3
AX,
AEN,
nIOCS16
t1
t6
t2
nIOR
t4
t5
DATA
(D0-D7)
DATA VALID
PD0-PD7, nERR,
PE, SLCT, nACK,
BUSY
t7
FINTR
nIOR/nIOW
PINTR
t8
t9
NOTE: 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
A0-A9,AEN, nIOCS16 Holdfrom
nIOR High
150
10
ns
ns
Data Access Time from nIOR Low
Data to Float Delay from nIOR High
Parallel Port Setup
t4
t5
t6
100
60
ns
ns
ns
10
20
40
Read Strobe to Clear FINTR
t7
t8
ns
ns
55
nIOR or nIOW Inactive for Transfers to
and from ECP FIFO
150
t9
260
ns
nIOR Active to PINTRInactive
FIGURE 3 - MICROPROCESSOR READ TIMING
139
SMSC [ SMSC CORPORATION ]
