SMJ320C31_07 Datasheet, PDF (27/59 Pages) Texas Instruments – DIGITAL SIGNAL PROCESSORS

SMJ320C31, SMJ320LC31, SMQ320LC31
DIGITAL SIGNAL PROCESSORS
SGUS026G − APRIL 1998 − REVISED SEPTEMBER 2006
changing XFx from an output to an input
The following table defines the timing parameters for changing the XFx pin from an output pin to an input pin.
timing of XFx changing from output to input mode for SMJ320C31 (see Figure 21)
NO.
34 th(H3H-XF) Hold time, XFx after H3 high
35 tsu(XF-H1L) Setup time, XFx before H1 low
36 th(H1L-XF)
Hold time, XFx after H1 low
* This parameter is not production tested.
’C31-40
MIN MAX
13*
9
0
’LC31-40
MIN MAX
13*
10
0
’C31-50
MIN MAX
12*
8
0
’C31-60
MIN MAX
11*
8
0
UNIT
ns
ns
ns
Execute
Load of IOF
H3
Buffers Go
From Output
to Output
Synchronizer Value on Pin
Delay
Seen in IOF
H1
I / OxFx Bit
(see Note A)
XFx Pin
Output
35
36
34
INXFx Bit
(see Note A)
Data
Sampled
Data
Seen
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 21. Timing for Change of XFx From Output to Input Mode
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