TMS320C80GF datasheet(157/171 Pages) TI

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TMS320C80

DIGITAL SIGNAL PROCESSOR

SPRS023B – JULY 1994 – REVISED OCTOBER 1997

154

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77251–1443

XPT input timing

The following description defines the sampling of the XPT[2:0] inputs. The value encoded on the XPT[2:0] inputs

is synchronized over multiple cycles to ensure that a stable value is present (see Figure 128 and Figure 129).

NO.

’C80-40

’C80-50

’C80-60

UNIT

MIN

MAX

MIN

MAX

tw(XPTV)

Pulse duration, XPTx valid†

12tH

tsu(XPTV-CKOH)

Setup time, XPT[2:0] valid before CLKOUT no longer low‡

13.5

th(CKOH-XPTV)

Hold time, XPT[2:0] valid after CLKOUT high

th(RLL-XPTV)

Hold time, XPT[2:0] valid after RL low§

6tH

† This parameter is a functional minimum assured by logic and is not tested.

‡ This parameter must only be met to ensure that the XPT input is recognized on the indicated cycle.

§ This parameter must be met to ensure that a second XPT request does nor occur. This parameter is a functional maximum assured by logic and

is not tested.

CLKOUT

XPT[2:0]

XPT Inputs Sampled

XPT Inputs Recognized

Figure 128. XPT Input Timing – XPT Recognition

CLKOUT

XPTn Row Status

XPTn

XPTz

STATUS[5:0]

XPT[2:0]

Figure 129. XPT Input Timing – XPT Service

TMS320C80GF Datasheet(PDF) 157 Page - Texas Instruments

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