SMJ320C80 Datasheet, PDF (143/157 Pages) Texas Instruments – DIGITAL SIGNAL PROCESSOR

SMJ320C80
DIGITAL SIGNAL PROCESSOR
SGUS025A – AUGUST 1998 – REVISED JUNE 2002
XPT input timing (see Figure 118 and Figure 119)
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.
NO
52 tw(XPTV)
Pulse duration, XPTx valid
53 tsu(XPTV-CKOH) Setup time, XPT[2:0] valid before CLKOUT no longer low
54 th(CKOH-XPTV) Hold time, XPT[2:0] valid after CLKOUT high
55 th(RLL-XPTV)
Hold time, XPT[2:0] valid after RL low
† _{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 not production tested.
MIN
12tH*
12^†
5
MAX
6tH^‡_*
XPT Inputs Sampled
XPT Inputs Recognized
UNIT
ns
ns
ns
ns
CLKOUT
XPT[2:0]
53
54
52
Figure 118. XPT Input Timing – XPT Recognition
CLKOUT
STATUS[5:0]
RL
XPT[2:0]
XPTn Row Status
55
XPTn
Figure 119. XPT Input Timing – XPT Service
XPTz
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