TMS320VC5421 datasheet(61/88 Pages) TI

61 / 88 page

TMS320VC5421

DIGITAL SIGNAL PROCESSOR

SPRS098 – DECEMBER 1999

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77251–1443

parallel I/O interface timing

switching characteristics over recommended operating conditions for a parallel I/O port read

(IOSTRB = 0)† (see Figure 28)

PARAMETER

MIN

MAX

UNIT

td(CLKL-A)

Delay time, CLKOUT low to address valid

td(CLKH-ISTRBL) Delay time, CLKOUT high to IOSTRB low

td(CLKH-ISTRBH) Delay time, CLKOUT high to IOSTRB high

th(A)IOR

Hold time, address after CLKOUT low

† Address and IS timings are included in timings referenced as address.

timing requirements for a parallel I/O port read (IOSTRB = 0) [H = 0.5 tc(CO)]† (see Figure 28)

MIN

MAX

UNIT

ta(A)IO

Access time, read data access from address valid

5H–3

ta(ISTRBL)IO

Access time, read data access from IOSTRB low

2H–3

tsu(D)IOR

Setup time, read data before CLKOUT high

th(D)IOR

Hold time, read data after CLKOUT high

th(ISTRBH-D)R Hold time, read data after IOSTRB high

† Address and IS timings are included in timings referenced as address.

R/W

IOSTRB

PPD[15:0]

PPA[18:0]

CLKOUT

th(A)IOR

td(CLKH–ISTRBH)

th(D)IOR

tsu(D)IOR

ta(A)IO

td(CLKH–ISTRBL)

td(CLKL–A)

ta(ISTRBL)IO

th(ISTRBH–D)R

Figure 28. Parallel I/O Port Read (IOSTRB=0)

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