AM3892 datasheet(185/299 Pages) TI

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AM3894

AM3892

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SPRS681A – OCTOBER 2010 – REVISED MARCH 2011

8.4.3.1

JTAG ID (JTAGID) Register Description

Table 8-27. JTAG ID Register(1)

HEX ADDRESS

ACRONYM

0x4814 0600

JTAGID

JTAG Identification Register(2)

(1)

IEEE Standard 1149.1-1990 Standard-Test-Access Port and Boundary Scan Architecture.

(2)

Read-only. Provides the device 32-bit JTAG ID.

The JTAG ID register is a read-only register that identifies to the customer the JTAG/device ID. For this

device, the JTAG ID register resides at address location 0x4814 0600. The register hex value for the

device is: 0x0B81 E02F. For the actual register bit names and their associated bit field descriptions, see

Figure 8-40 and Table 8-28.

28 27

12 11

VARIANT

PART NUMBER (16-bit)

MANUFACTURER (11-bit)

LSB

(4-bit)

R-0000

R-1011 1000 0001 1110

R-0000 0010 111

R-1

LEGEND: R/W = Read/Write; R = Read only; -n = value after reset

Figure 8-40. JTAG ID Register Description - Device Register Value: 0x0B81 E02F

Table 8-28. JTAG ID Register Selection Bit Descriptions

Bit

Field

Description

31:28

VARIANT

Variant (4-bit) value. Device value: 0x0

27:12

PART NUMBER

Part Number (16-bit) value. Device value: 0xB81E

11:1

MANUFACTURER

Manufacturer (11-bit) value. Device value: 0x017

LSB

LSB. This bit is read as a 1 for this device.

8.4.3.2

JTAG Electrical Data/Timing

Table 8-29. Timing Requirements for IEEE 1149.1 JTAG

(see Figure 8-41)

NO.

MIN

MAX

UNIT

tc(TCK)

Cycle time, TCK

51.15

tw(TCKH)

Pulse duration, TCK high (40% of tc)

20.46

tw(TCKL)

Pulse duration, TCK low (40% of tc)

20.46

tsu(TDI-TCK)

Input setup time, TDI valid to TCK high (20% of (tc * 0.5))

5.115

tsu(TMS-TCK)

Input setup time, TMS valid to TCK high (20% of (tc * 0.5))

5.115

th(TCK-TDI)

Input hold time, TDI valid from TCK high

th(TCK-TMS)

Input hold time, TMS valid from TCK high

Table 8-30. Switching Characteristics Over Recommended Operating Conditions for IEEE 1149.1 JTAG

(see Figure 8-41)

NO.

PARAMETER

MIN

MAX

UNIT

td(TCKL-TDOV)

Delay time, TCK low to TDO valid

23.575(1)

(1)

(0.5 * tc) - 2

Peripheral Information and Timings

185

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