Texas Instruments TMS320C2XX Example E1. Key Timing for a Single-Processor System Without Buffers, Example E2. Key Timing for a Single- or Multiple-Processor System With Buffered Input and Output

Emulation Timing Calculations
E-8
Example E–1. Key Timing for a Single-Processor System Without Buffers
tpd TCK_RET-TMS TDI
tdTMSmax tsu TTMS
tTCKfactor
(20 ns 10 ns)
0.4
75 ns, or 13.3 MHz
tpd TCK_RET–TDO
td TTDO tsu TDOmin
tTCKfactor
(15 ns 3ns )
0.4
45 ns, or 22.2 MHz
In this case, because the TCK_RET-to-TMS/TDI path requires more time to
complete, it is the limiting factor.
Example E–2. Key Timing for a Single- or Multiple-Processor System With Buffered Input
and Output
tpd(TCK_RET-TMS TDI)
td(TMSmax)tsu(TTMS)tbufskew
tTCKfactor
(20 ns 10 ns 1.35 ns)
0.4
78.4 ns, or 12.7 MHz
tpd(TCK_RET–TDO)
td(TTDO)tsu (TDOmin) td (bufmax)
tTCKfactor
70 ns, or 14.3 MHz
(15 ns 3ns 10 ns)
0.4
In this case also, because the TCK_RET-to-TMS/TDI path requires more time
to complete, it is the limiting factor.