TMS320VC33 datasheet(38/57 Pages) TI

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TMS320VC33

DIGITAL SIGNAL PROCESSOR

SPRS087E − FEBRUARY 1999 − REVISED JANUARY 2004

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77251−1443

changing XFx from an output to an input

The following tables define the timing parameters for changing the XFx pin from an output pin to an input pin.

timing requirements for changing XFx from output to input mode (see Figure 26)

VC33-120

VC33-150

UNIT

MIN

MAX

MIN

MAX

UNIT

tsu(XF-H1L)

Setup time, XFx before H1 low

th(H1L-XF)

Hold time, XFx after H1 low

switching characteristics over recommended operating conditions for changing XFx from output to

input mode (see Figure 26)

PARAMETER

VC33-120

VC33-150

UNIT

PARAMETER

MIN

MAX

MIN

MAX

UNIT

tdis(H3H-XF)

Disable time, XFx after H3 high

Execute

Load of IOF

Buffers Go

From Output

to Output

Synchronizer

Delay

Value on Pin

Seen in IOF

XFx

INXFx Bit

(see Note A)

I / OxFx Bit

(see Note A)

Data

Sampled

Data

Seen

Output

tdis(H3H-XF)

tsu(XF-H1L)

th(H1L-XF)

NOTE A: I / OxFx represents either bit 1 or bit 5 of the IOF register, and INXFx represents either bit 3 or bit 7 of the IOF register.

Figure 26. Timing for Changing XFx From Output to Input Mode

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