Microchip MPFS460TLS handleiding
Handleiding
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FlashPro Express User Guide
53
Some designers of high-integrity boards (military and avionic) may arrange their boards so that TRST is tied to
ground via a weak pull-down resistor. The purpose of this is to hold the JTAG state-machine in a reset state by
default, so that even with TCK oscillating, some sudden ion bombardment or other electrical even will not
suddenly throw the JTAG state-machine into an unknown state. If your design also uses a weak pull-down
resistor on TRST on your board, then enabling the “Drive TRST” flag will be required to force the JTAG state-
machine out of reset to permit programming to take place. With most boards, there is no need to select this flag.
JTAG Switching Characteristics
FlashPro6 Characteristics
Table 8 · JTAG Switching Characteristics for FlashPro6
Description Symbol Min Max Unit
Output Delay from TCK to TDI, TMS TTCKTDI
2
2.2
ns
TDO setup time before TCK rising, VJTAG=3.3V TTDOTCK 11.4 481
ns
TDO setup time before TCK rising, VJTAG=1.5V TTDOTCK 10.5 487
ns
TDO Hold time after TCK rising TTCKTDO
0
-
TCK period TTCK 49.4
-
ns
FlashPro5/4/3/3X Characteristics
Table 9 · JTAG Switching Characteristics for FlashPro5/4/3/3X
Description Symbol Min Max Unit
Output delay from TCK to TDI, TMS TTCKTDI -2
2
ns
TDO setup time before TCK rising, VJTAG=3.3 TTDOTCK 12
ns
TDO setup time before TCK rising, VJTAG=1.5 TTDOTCK 14.5
ns
TDO hold time after TCK rising TTCKTDO
0
ns
TCK period TTCK 41.7 10667 ns
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Productinformatie
| Merk | Microchip |
| Model | MPFS460TLS |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 10235 MB |
