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JTAG-HS3 Reference Manual

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DC Operating Characteristics

Symbol

Parameter

Min

Typ

Max

Unit

Vref

I/O reference/supply voltage

1.65

1.8/2.5/3.3

5.5

Volts

TDO

Input High Voltage (V

)

1.4

5.5

Volts

Input Low Voltage (V

)

0.45

Volts

TMS, TCK, TDI

Output High (V

)

0.75 x Vref

0.90 x Vref

Vref

Volts

Output Low (V

)

0.05 x Vref

0.15 x Vref

Volts

SRST

Output Low (V

)

= 1.5K ohm)

0.4

0.55

Volts

Operating Temperature

ºC

AC Operating Characteristics

The JTAG-HS3 JTAG signals operate according to the timing diagram in Fig. 7. The HS3 supports TCK frequencies

from 30 MHz to 8 KHz at integer divisions of 30 MHz from 1 to 3750. Common frequencies include 30 MHz, 15

MHz, 10 MHz, 7.5 MHz, and 6 MHz (see Table 4).

TMS/TDI

TCK

TDO

CKL

CKH

Symbol

Parameter

Min

Max

period

33ns

125µs

CKH

, T

CKL

CLK

pulse width

16.6ns

62.5µs

CLK

to TMS, TDI

15ns

TDO Setup time

19ns

TDO Hold time

Figure 7. Timing diagram.

Table 4. JTAG-HS3 Frequency support.

1 2 3 4 5 6

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