t15
AEN
t16
t3
t2
FDRQ,
PDRQ
t1
t4
FDACKX
PDACKX
t12
t14
t11
t6
t5
nIOR
or
nIOW
t8
t10
t9
t7
DATA
(DO-D7)
DATA VALID
t13
TC
FDRQ refers to the DRQ assigned to the Floppy Disk
PDRQ refers to the DRQ assigned to the Parallel Port
FDACKX refers to the nDACK assigned to the to the Floppy Disk
PDACKX refers to the nDACK assigned to the Parallel Port
Parameter
min
typ
max
units
0
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
t1
nDACK Delay Time from FDRQ High
DRQ Reset Delay from nIOR or nIOW
FDRQ Reset Delay from nDACK Low
nDACK Width
100
100
t2
t3
150
0
0
t4
nIOR Delay from FDRQ High
nIOW Delay from FDRQ High
Data Access Time from nIOR Low
Data Set Up Time to nIOW High
Data to Float Delay from nIOR High
Data Hold Time from nIOW High
nDACK Set Up to nIOW/nIOR Low
nDACK Hold After nIOW/nIOR High
TC Pulse Width
t5
t6
100
60
t7
40
10
10
5
10
60
40
10
t8
t9
t10
t11
t12
t13
t14
t15
t16
AEN Set Up to nIOR/nIOW
AEN Hold from nDACK
100
TC Active to PDRQ Inactive
FIGURE 10 - DMA TIMING
SMSC DS – FDC37N3869
Page 119
Rev. 10/25/2000
SMSC [ SMSC CORPORATION ]
