AM1806 datasheet(232/241 Pages) TI

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TDO

Router

TDI

Steps

CLK

TMS

Router

ARM926EJ-S/ETM

AM1806

SPRS658B – FEBRUARY 2010 – REVISED MAY 2010

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Table 6-122. JTAG Port Description (continued)

TYPE

NAME

DESCRIPTION

EMU0

I/O

Emulation 0

Channel 0 trigger + HSRTDX

EMU1

I/O

Emulation 1

Channel 1 trigger + HSRTDX

6.30.2 Scan Chain Configuration Parameters

Table 6-123 shows the TAP configuration details required to configure the router/emulator for this device.

Table 6-123. JTAG Port Description

Router Port ID

Default TAP

TAP Name

Tap IR Length

C674x

ARM926

ETB

The router is revision C and has a 6-bit IR length.

6.30.3 Initial Scan Chain Configuration

The first level of debug interface that sees the scan controller is the TAP router module. The debugger

can configure the TAP router for serially linking up to 16 TAP controllers or individually scanning one of

the TAP controllers without disrupting the IR state of the other TAPs.

6.30.3.1 Adding TAPS to the Scan Chain

The TAP router must be programmed to add additional TAPs to the scan chain. The following JTAG scans

must be completed to add the ARM926EJ-S to the scan chain.

A Power-On Reset (POR) or the JTAG Test-Logic Reset state configures the TAP router to contain only

the router’s TAP.

Figure 6-78. Adding ARM926EJ-S to the scan chain

Pre-amble: The device whose data reaches the emulator first is listed first in the board configuration file.

This device is a pre-amble for all the other devices. This device has the lowest device ID.

Post-amble: The device whose data reaches the emulator last is listed last in the board configuration file.

This device is a post-amble for all the other devices. This device has the highest device ID.

•

Function : Update the JTAG preamble and post-amble counts.

–

Parameter : The IR pre-amble count is '0'.

–

Parameter : The IR post-amble count is '0'.

–

Parameter : The DR pre-amble count is '0'.

–

Parameter : The DR post-amble count is '0'.

–

Parameter : The IR main count is '6'.

232

Peripheral Information and Electrical Specifications

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