SM320LF2407-EP Datasheet, PDF (85/112 Pages) Texas Instruments – 
DSP CONTROLLERS

external memory interface write timings
SM320LF2407AĆEP
DSP CONTROLLERS
SGUS036B − JULY 2003 − REVISED OCTOBER 2003
switching characteristics over recommended operating conditions for an external memory
interface write at 40 MHz [H = 0.5t_c(CO)] (see Figure 39)
PARAMETER
MIN MAX UNIT
td(COH-CNTL) Delay time, CLKOUT high to control valid
4 ns
td(COH-CNTH) Delay time, CLKOUT high to control inactive
5 ns
td(COH-A)W
td(COH-RWL)
Delay time, CLKOUT high to address valid
Delay time, CLKOUT high to R/W low
10 ns
6 ns
td(COH-RWH) Delay time, CLKOUT high to R/W high
6 ns
td(COL-WL)
Delay time, CLKOUT low to WE strobe active low
6 ns
td(COL-WH)
Delay time, CLKOUT low to WE strobe inactive high
6 ns
ten(D)COL
Enable time, data bus driven from CLKOUT low
−3
ns
td(COL-SL)
Delay time, CLKOUT low to STRB active low
6 ns
td(COL-SH)
Delay time, CLKOUT low to STRB inactive high
6 ns
td(WRN)
Delay time, W/R going low to R/W rising
5 ns
th(A)COLW
tsu(A)W
Hold time, address valid after CLKOUT low
Setup time, address valid before WE strobe active low
−5
ns
H−9
ns
tsu(D)W
th(D)W
Setup time, write data before WE strobe inactive high
Hold time, write data after WE strobe inactive high
2H−17
ns
2†
ns
tdis(W-D)
Disable time, data bus high impedance from WE high
† _{Not verified; for informational purposes only.}
5
ns
• POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443
85