Texas Instruments TCM4300 - Manual (Page 33)

3–10
3.10 Switching Characteristics, TCM4300 to DSP Interface (Read Cycle) (see
Figure 3–10)
PARAMETER
ALTERNATE
SYMBOL
MIN MAX UNIT
tsu(R/W)
Setup time, read/write DSPRW stable before falling edge of
strobe DSPSTRBL
TRW(SU) 0 ns
th(R/W)
Hold time, read/write DSPRW stable after rising edge of
strobe DSPSTRBL
TRW(HO) 0 ns
tsu(CS)
Setup time, chip select stable DSPCSL before falling edge
of strobe DSPSTRBL
TCS(SU) 0 ns
th(CS)
Hold time, chip select DSPCSL stable after rising edge of
strobe DSPSTRBL
TCS(HO) 0 ns
tsu(RA)
Setup time, read address DSPA stable before strobe
DSPSTRBL goes low
TWA(SU) 0 ns
th(RA)
Hold time, read address DSPA stable after strobe
DSPSTRBL goes high
TWA(HO) 0 ns
ten(R)
Enable time, read data on falling edge of strobe DSPSTRBL
to TCM4300 driving data bus DSPD
TRD(EN) 0 ns
td(DV)
Delay read data valid time on falling edge of strobe
DSPSTRBL to valid data DSPD
TRD(DV) 50 ns
th(R)
Hold time, read data DSPD invalid after rising edge of
strobe DSPSTRBL
TRD(INV) 5 ns
tdis(R)
Disable time, read data. TCM4300 releases data bus after
rising edge of strobe DSPSTRBL
TRD(DIS) 12 ns
90%
10%
th(R)
DSPA
DSPSTRBL
DSPD
tsu(R / W)
10%
DSPCSL
DSPRW
ОО
ОО
ОО
ОО
tsu(CS) th(CS)
th(RA)
tsu(RA)
10%
10%
90%
90% 90%
ten(R)
td(DV)
tdis(R)
th(R / W)
Figure 3–10. TCM4300 to DSP Interface (Read Cycle)