t2
PDATA<7:0>
t1
t5
t6
nACK
t4
t3
t4
nAUTOFD
FIGURE 30 - ECP PARALLEL PORT REVERSE TIMING
TABLE 98 - ECP PARALLEL PORT REVERSE TIMING
NAME
DESCRIPTION
PDATA Valid to nACK Asserted
MIN
0
0
TYP
MAX
UNITS
ns
ns
t1
t2
t3
nAUTOFD Deasserted to PDATA Changed
nACK Asserted to nAUTOFD Deasserted
(Notes 1,2)
nACK Deasserted to nAUTOFD Asserted (Note 2)
nAUTOFD Asserted to nACK Asserted
nAUTOFD Deasserted to nACK Deasserted
80
200
200
ns
t4
t5
t6
80
0
0
ns
ns
ns
Note 1: Maximum value only applies if there is room in the FIFO and terminal count has not been
received. ECP can stall by keeping nAUTOFD low.
Note 2: nACK is not considered asserted or deasserted until it is stable for a minimum of 75 to 130 ns.
232
SMSC [ SMSC CORPORATION ]
