ISA READ TIMING
DESCRIPTION
NAME
t1
MIN
10
TYP MAX UNITS
SA[x], nCS and AEN valid to nIOR asserted
nIOR asserted to nIOR deasserted
ns
ns
ns
t2
50
t3
nIOR asserted to SA[x], nCS invalid
nIOR asserted to Data Valid
10
t4
50
25
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
t5
Data Hold/float from nIOR deasserted
nIOR deasserted
10
25
t6
t8
nIOR asserted after nIOW deasserted
nIOR/nIOR, nIOW/nIOW transfers from/to ECP FIFO
Parallel Port setup to nIOR asserted
nIOR asserted to PINTER deasserted
nIOR deasserted to FINTER deasserted
nIOR deasserted to PCOBF deasserted (Notes 3,5)
nIOR deasserted to AUXOBF1 deasserted (Notes 4,5)
nIOW deasserted to AEN invalid
80
t8
150
t7
20
55
t9
t10
t11
t12
t13
260
80
80
10
Note 1: FINTR refers to the IRQ used by the floppy disk.
Note 2: PINTR refers to the IRQ used by the parallel port.
Note 3: PCOBF is used for the Keyboard IRQ.
Note 4: AUXOBF1 is used for the Mouse IRQ.
Note 5: Applies only if deassertion is performed in hardware.
155
SMSC [ SMSC CORPORATION ]
