Digilent 210-251P-BOARD Bedienungsanleitung PDF herunterladen (Seite 10)

JTAG-SMT2 Reference Manual

Other product and company names mentioned may be trademarks of their respective owners.

Page 10 of 11

DC Operating Characteristics

Symbol

Parameter

Min

Typ

Max

Unit

Vdd

Operating supply voltage

2.97

3.3

3.63

Volts

Vref

I/O reference/supply voltage

1.65

2.5/3.3

5.5

Volts

TDO, GPIO0,

GPIO1, GPIO2

Input High Voltage (V

)

1.62

5.5

Volts

Input Low Voltage (V

)

0.65

Volts

TMS, TCK, TDI,

GPIO0, GPIO1,

GPIO2

Output High (V

)

0.85 x Vref

0.95 x Vref

Vref

Volts

Output Low (V

)

0.05 x Vref

0.15 x Vref

Volts

Operating Temperature

ºC

AC Operating Characteristics

The JTAG-SMT2’s JTAG signals operate according to the timing diagram in Fig. 12. The SMT2 supports JTAG/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 2). The JTAG/TCK operating frequency can be set within the

Xilinx Tools. Note: Please refer to Xilinx’s iMPACT documentation for more information.

Symbol

Parameter

Min

Max

period

33ns

2.185ms

CKH

, T

CKL

CLK

pulse width

20ns

1.1ms

CLK

to TMS, TDI

15ns

TDO Setup time

19ns

TDO Hold time

Mounting to Host PCBs

The JTAG-SMT2 module has a moisture sensitivity level (MSL) of 6. Prior to reflow, the JTAG-SMT2 module must be

dried by baking it at 125° C for 17 hours. Once this process has been completed, the module has a MSL of 3 and is

suitable for reflow for up to 168 hours without additional drying.

The factory finishes the JTAG-SMT2 signal pads with the ENIG process using 2u” gold over 150u” electroless nickel.

This makes the SMT2 compatible with most mounting and reflow processes (see Fig. 13). The binding force of the

solder is sufficient to hold the SMT2 firmly in place so mounting should require no additional adhesives.

Figure 12. Timing diagram.

TMS/TDI

TCK

TDO

CKL

CKH

Table 2. JTAG frequency support.

1 2 ... 5 6 7 8 9 10 11

Kommentare zu diesen Handbüchern

Keine Kommentare

Digilent 210-251P-BOARD Bedienungsanleitung Seite 10

Kommentare zu diesen Handbüchern

Verwandte Produkte und Handbücher für Hardware Digilent 210-251P-BOARD