DSM2190F4V datasheet(10/61 Pages) STMICROELECTRONICS

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DSM2190F4

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TYPICAL CONNECTIONS

Figure 6 shows a typical connection scheme.

Many connection possibilities exist since many

DSM pins are multipurpose. This scheme illus-

trates the use of a combined function BSM signal

(functions as BMS and MSx), and many I/O pins. It

also illustrates how to chain the DSM and DSP de-

vices together on the JTAG bus. The JTAG con-

nector definition depends on development and

production environment requirements. A specially

defined connector can be devised to combine the

signals of the FlashLINK and the Analog Devices

emulator. Alternatively, two separate JTAG con-

nectors can be used, one matching the pinout of

FlashLINK and the other matching the emulator pi-

nout.

Keep in mind that signals BMS, IOMS, MSx,

ADDR16, ADDR17, ADDR18 can be connected to

any DSM pin that is a PLD input. I/O pins on Port

B and Port C are more capable (more PLD func-

tions) than Port D pins. It is recommended to use

Port D pins primarily for decode inputs first, leav-

ing pins on Port B and Port C available for general

logic. Figure 6 illustrates a common way to make

connections.

Following are connection options to consider:

Port C JTAG: Figure 6 shows four JTAG signals

(TMS, TCK, TDI, TDO) connected to the DSM. Al-

ternatively, using six-pin JTAG (two more signals,

TSTAT and TERR) can reduce ISP time by as

much as 30% compared to four-pin JTAG. Other

JTAG options include multiplexing JTAG pins with

general I/O (see “Programming In-Circuit using

JTAG ISP” on page 40 and Application Note

AN1153), or not using JTAG at all. If no JTAG is

used, the DSM device has to be programmed on a

conventional programmer before it is installed on

the circuit board. Using no JTAG makes more

DSM I/O available.

Pins PC2 and PD2. If not all 288K address loca-

tions need to be decoded in the DSM, then

ADDR18 on pin PD2 is not needed. In this case,

the IOMS signal can be connected to pin PD2, free-

ing pin PC2 for general I/O usage.

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