USB97C102 Datasheet, PDF (77/80 Pages) SMSC Corporation – Multi-Endpoint USB Peripheral Controller with Integrated 5 Port HUB

t9
FALE
t10
t11
t3
FA]
t1
t2
t10
nRD
t4
t8
t7
FD
DATA VALID
FIGURE 20 - 8051 FLASH PROGRAM FETCH TIMING
Table 127 - 8051 Flash Program Fetch Timing Parameters
OSCILLATOR
PARAMETER
MIN
TYP MAX EQUATION UNITS
t1 FA Valid to nRD asserted
64
2t-20
ns
t2 nRD active pulse width
105
3t-20
ns
t3 nRD deasserted to FA Invalid
32
t-10
ns
t4 nRD asserted to Data Valid
0
ns
t7 FD data Hold from nRD
0
ns
deasserted
t8 nRD deasserted to FD data tri-
32
t-10
ns
state
t9 FALE active pulse width
53
2t-30
ns
t10 FA address Valid to FALE
21.66
t-20
ns
deasserted
t11 FALE deasserted to nRD asserted 21.66
t-20
ns
Note: Min and Max delays shown for an 8051 clock of 24MHz, to calculate timing delays for other clock
frequencies use the Oscillator Equations, where T=1/Fclk.
SMSC DS – USB97C102
Page 77
Rev. 03/23/2000