SP37E760 Datasheet, PDF (75/78 Pages) SMSC Corporation – 3.3 V I/O CONTROLLER FOR EMBEDDED APPLICATIONS

PDATA<7:0>
nACK
nAUTOFD
t2
t1
t5
t6
t4
t3
t4
Parameter
min
max units Notes
t1 PDATA Valid to nACK Asserted
0
ns
t2 nAUTOFD Deasserted to PDATA
0
ns
Changed
t3 nACK Asserted to nAUTOFD
80
200
ns
1,2
Deasserted
t4 nACK Deasserted to nAUTOFD
80
200
ns
2
Asserted
t5 nAUTOFD Asserted to nACK Asserted
0
ns
t6 nAUTOFD Deasserted to nACK
0
ns
Deasserted
NOTES:
1. Maximum value only applies if there is room in the FIFO and a terminal count has not
been received. ECP can stall by keeping nAUTOFD low.
2. nACK is not considered asserted or deasserted until it is stable for a minimum of 75 to
130 ns.
FIGURE 16 - ECP PARALLEL PORT REVERSE TIMING
SMSC DS – SP37E760
Page 75
Rev. 04/13/2001