t6
t3
PDATA
t1
t2
t5
nSTROBE
t4
BUSY
Parameter
min
max
units
Notes
t1
t2
t3
t4
t5
t6
DATA Valid to nSTROBE Active
nSTROBE Active Pulse Width
DATA Hold from nSTROBE Inactive
nSTROBE Active to BUSY Active
BUSY Inactive to nSTROBE Active
BUSY Inactive to PDATE Invalid
600
600
450
ns
ns
ns
ns
ns
ns
1
1
500
680
80
NOTE:
1. The data is held until BUSY goes inactive or for time t3, whichever is longer. This only
applies if another data transfer is pending. If no other data transfer is pending, the data
is held indefinitely.
FIGURE 24 - PARALLEL PORT FIFO TIMING
t3
nAUTOFD
t4
PDATA<7:0>
t2
t1
t7
t8
nSTROBE
BUSY
t6
t5
t6
Parameter
min
max
units
Notes
t1
t2
t3
nAUTOFD Valid to nSTROBE Asserted
PDATA Valid to nSTROBE Asserted
BUSY Deasserted to nAUTOFD
Changed
nBUSY Deasserted to PDATA Changed
nSTROBE Asserted to BUSY Asserted
nSTROBE Deasserted to Busy
Deasserted
0
0
60
60
ns
ns
ns
80
180
1,2
1,2
t4
t5
t6
80
0
0
180
ns
ns
ns
t7
t8
nBUSY Deasserted to nSTROBE
Asserted
80
80
200
180
ns
ns
1,2
2
nBUSY Asserted to nSTROBE
Deasserted
NOTES:
1. Maximum value only applies if there is data in the FIFO waiting to be written out.
2. BUSY is not considered asserted or deasserted until it is stable for a minimum of 75 to
130 ns.
FIGURE 25 - ECP PARALLEL PORT FORWARD TIMING
SMSC DS – FDC37N3869
Page 134
Rev. 07/21/2000
SMSC [ SMSC CORPORATION ]
