DS3172 datasheet(211/232 Pages) DALLAS

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13.4 JTAG ID Codes

Table 13-2. JTAG ID Codes

DEVICE

REVISION

ID[31:28]

DEVICE CODE

ID[27:12]

MANUFACTURER’S CODE

ID[11:1]

REQUIRED

ID[0]

DS3171

Consult factory

0000000001000100

00010100001

DS3172

Consult factory

0000000001000101

00010100001

DS3173

Consult factory

0000000001000110

00010100001

DS3174

Consult factory

0000000001000111

00010100001

13.5 JTAG Functional Timing

This functional timing for the JTAG circuits shows:

The JTAG controller starting from reset state

Shifting out the first 4 LSB bits of the IDCODE

Shifting in the BYPASS instruction (111) while shifting out the mandatory X01 pattern

Shifting the TDI pin to the TDO pin through the bypass shift register

An asynchronous reset occurs while shifting

Figure 13-3. JTAG Functional Timing

JTCLK

JTRST

JTMS

JTDI

JTDO

(STATE)

Reset

Run Test

Idle

Select DR

Scan

Capture

Shift

Exit1

Update

Select DR

Scan

Select IR

Scan

Capture

Shift IR

Exit1

Update

Select DR

Scan

Capture

Shift

Test

Logic Idle

(INST)

IDCODE

BYPASS

IDCODE

Output

Output pin level change if in "EXTEST" instruction mode

13.6 IO Pins

All input, output, and inout pins are inout pins in JTAG mode.

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