AM1808 datasheet(250/262 Pages) TI

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TDI

Router

ARM926EJ-S/ETM

TDO

Steps

CLK

TMS

Router

ARM926EJ-S/ETM

ETB

AM1808

SPRS653C

– FEBRUARY 2010 – REVISED DECEMBER 2011

www.ti.com

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

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

– Parameter : The IR post-amble count is '6'.

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

– Parameter : The DR post-amble count is '1'.

– Parameter : The IR main count is '4'.

– Parameter : The DR main count is '1'.

The initial scan chain contains only the TAP router module. The following steps must be completed in

order to add ETB TAP to the scan chain.

Figure 5-87. Adding ETB to the scan chain

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Function : Do a send-only JTAG IR/DR scan.

– Parameter : The route to JTAG shift state is 'shortest transition'.

– Parameter : The JTAG shift state is 'shift-ir'.

– Parameter : The JTAG destination state is 'pause-ir'.

– Parameter : The bit length of the command is '6'.

– Parameter : The send data value is '0x00000007'.

– Parameter : The actual receive data is 'discarded'.

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Function : Do a send-only JTAG IR/DR scan.

– Parameter : The route to JTAG shift state is 'shortest transition'.

– Parameter : The JTAG shift state is 'shift-dr'.

– Parameter : The JTAG destination state is 'pause-dr'.

– Parameter : The bit length of the command is '8'.

– Parameter : The send data value is '0x00000089'.

– Parameter : The actual receive data is 'discarded'.

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Function : Do a send-only JTAG IR/DR scan.

– Parameter : The route to JTAG shift state is 'shortest transition'.

– Parameter : The JTAG shift state is 'shift-ir'.

– Parameter : The JTAG destination state is 'pause-ir'.

– Parameter : The bit length of the command is '6'.

– Parameter : The send data value is '0x00000002'.

– Parameter : The actual receive data is 'discarded'.

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Function : Embed the port address in next command.

– Parameter : The port address field is '0x0f000000'.

– Parameter : The port address value is '3'.

250

Peripheral Information and Electrical Specifications

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