USB97CFDC2-01 Datasheet, PDF (17/24 Pages) SMSC Corporation – USB Floppy Disk Controller

9 AC PARAMETERS
CLOCKI
t1
t2
t2
FIGURE 1 - INPUT CLOCK TIMING
NAME
t1
t2
t_r, t_f
Table 2 – Input Clock Timing Parameters
DESCRIPTION
MIN
TYP
Clock Cycle Time for 14.318MHz
69.84
Clock High Time/Low Time for 24MHz
41.9/
27.9
Clock Rise Time/Fall Time (not shown)
MAX
27.9/
41.9
5
UNITS
ns
ns
ns
t1
FA[0:19
]
FD[7:0
nFRD
nFW R
t3
t2
t5
t4
FIGURE 2 – FLASH READ TIMING
Table 3 – Flash Read Timing
NAME
PARAMETER
MIN TYP MAX
t1 FA[14:0] Address setup time to nFRD asserted
40
t2 nFRD pulse width
110
t3 FD[7:0] Data setup time to nFRD de-asserted
30
t4 FD[7:0] Data hold time from nFRD de-asserted
0
t5
FA[14:0] Address hold time from nFRD de-asserted
35
UNITS
ns
ns
ns
ns
ns
SMSC DS – USB97CFDC2-01
Page 17
DATASHEET
Rev. 02-27-07