LPC47S45X Datasheet, PDF (241/259 Pages) SMSC Corporation – Advanced I/O with X-Bus Interface

t2
PDATA<7:0>
nACK
t1
t5
t6
t4
t3
t4
nAUTOFD
FIGURE 32 − ECP PARALLEL PORT REVERSE TIMING
NAME
t1
t2
t3
t4
t5
t6
DESCRIPTION
PDATA Valid to nACK Asserted
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
MIN TYP MAX UNITS
0
ns
0
ns
80
200
ns
80
200
ns
0
ns
0
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.
SMSC LPC47S45x
Page 241 of 259
DATASHEET
Rev. 06-01-06