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MOTOROLA M68040 USER’S MANUAL C- 17
TDI
TMS
TCLK
TDO NO CONNECTION
+5V
1K
Figure C-10. Circuit Disabling IEEE Standard 1149.1A
C.6.5 MC68040V and MC68EC040V JTAG Electrical Characteristics
The following paragraphs provide information on JTAG electrical and timing specifications
This section is subject to change. For the most recent specifications, contact a Motorola
sales office or complete the registration card at the beginning of this manual.
JTAG DC Electrical Specifications—PRELIMINARY
Characteristic Symbol Min Max Unit
Input High Voltage VIH 2 5.5 V
Input Low Voltage VIL GND 0.8 V
Overshoot — TBD V
TCK Input Leakage Current @ 0.5–2.4 V Iin TBD TBD µA
TDO Hi-Z (Off-State) Leakage Current @ 0.5–2.4 V ITST TBD TBD µA
Signal Low Input Current, VIL = 0.8 V
TMS, TDI
ILTBD TBD mA
Signal High Input Current, VIH = 2.0 V
TMS, TDI
IHTBD TBD mA
TDO Output High Voltage IOH = 5ma VOH 2.4—V
TDO Output Low Voltage IOL = 5ma VOL — 0.5 V
Capacitance*, Vin = 0 V, f = 1 MHz Cin TBD pF
*Capacitance is periodically sampled rather than 100% tested.
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