t6
t3
PD<7:0>
t1
t2
t5
nSTROBE
t4
BUSY
FIGURE 32 – PARALLEL PORT FIFO TIMING
NAME
DESCRIPTION
PDATA Valid to nSTROBE Active
nSTROBE Active Pulse Width
PDATA Hold from nSTROBE Inactive (Note 1)
nSTROBE Active to BUSY Active
BUSY Inactive to nSTROBE Active
BUSY Inactive to PDATA Invalid (Note 1)
MIN
600
600
450
TYP
MAX
UNITS
ns
ns
ns
ns
t1
t2
t3
t4
t5
t6
500
680
80
ns
ns
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.
t3
nALF
t4
PD<7:0>
t2
t1
t7
t8
nSTROBE
BUSY
t6
t5
t6
FIGURE 33 – ECP PARALLEL PORT FORWARD TIMING
NAME
DESCRIPTION
nALF Valid to nSTROBE Asserted
PDATA Valid to nSTROBE Asserted
BUSY Deasserted to nALF Changed
(Notes 1,2)
MIN
0
0
TYP
MAX
60
60
UNITS
ns
ns
t1
t2
t3
80
180
ns
t4
t5
t6
t7
t8
BUSY Deasserted to PDATA Changed (Notes 1,2)
nSTROBE Asserted to Busy Asserted
nSTROBE Deasserted to Busy Deasserted
BUSY Deasserted to nSTROBE Asserted (Notes 1,2)
BUSY Asserted to nSTROBE Deasserted (Note 2)
80
0
0
80
80
180
ns
ns
ns
ns
ns
200
180
Note 1: Maximum value only applies if there is data in the FIFO waiting to be written out.
Note 2: BUSY is not considered asserted or deasserted until it is stable for a minimum of 75 to 130 ns.
SMSC DS – LPC47M14X
Page 191
Rev. 03/19/2001
SMSC [ SMSC CORPORATION ]
