SPC572L64F2 datasheet(74/112 Pages) STMICROELECTRONICS

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Electrical characteristics

SPC572Lx

74/112

DocID027866 Rev 5

Figure 24. Nexus event trigger and test clock timings

tNTDIH

TDI/TDIC data hold time

—

13(9)

tNTMSS

TMS/TMSC data setup time

—

tNTMSH

TMS/TMSC data hold time

—

15(10)

—

TDO/TDOC propagation delay from falling edge of TCK(11)

—16

—

TDO/TDOC hold time with respect to TCK falling edge

(minimum TDO/TDOC propagation delay)

2.25

—

1. Nexus timing specified at VDD_HV_IO_JTAG = 4.0 V to 5.5 V, and maximum loading per pad type as specified in the I/O

section of the datasheet.

2. tCYC is system clock period.

3. Achieving the absolute minimum TCK cycle time may require a maximum clock speed (system frequency / 8) that is less

than the maximum functional capability of the design (system frequency / 4) depending on the actual peripheral frequency

being used. To ensure proper operation TCK frequency should be set to the peripheral frequency divided by a number

greater than or equal to that specified here.

4. This is a functionally allowable feature. However, it may be limited by the maximum frequency specified by the Absolute

minimum TCK period specification.

5. This value is TDO/TDOC propagation time 36 ns + 4 ns setup time to sampling edge.

6. This may require a maximum clock speed (system frequency / 8) that is less than the maximum functional capability of the

design (system frequency / 4) depending on the actual system frequency being used.

7. This value is TDO/TDOC propagation time 16 ns + 4 ns setup time to sampling edge.

8. TDIC represents the TDI bit frame of the scan packet in compact JTAG 2-wire mode.

9. TMSC represents the TMS bit frame of the scan packet in compact JTAG 2-wire mode.

10. TDOC represents the TDO bit frame of the scan packet in compact JTAG 2-wire mode.

11. Timing includes TCK pad delay, clock tree delay, logic delay and TDO/TDOC output pad delay.

Table 39. Nexus debug port timing(1) (continued)

Symbol

Characteristic

Value

Unit

Min

Max

TCK

EVTI

EVTO

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