SAF7113 datasheet(35/80 Pages) PHILIPS

35 / 80 page

2000 May 08

Philips Semiconductors

Product speciﬁcation

9-bit video input processor

SAF7113H

9.1

Initialization of boundary scan circuit

The TAP (Test Access Port) controller of an IC should be

in the reset state (TEST_LOGIC_RESET) when the IC is

in functional mode. This reset state also forces the

instruction register into a functional instruction such as

IDCODE or BYPASS.

To solve the power-up reset, the standard specifies that

the TAP controller will be forced asynchronously to the

TEST_LOGIC_RESET state by setting the TRST pin

LOW.

9.2

Device identiﬁcation codes

A device identification register is specified in

“IEEE Std.

1149.1b-1994”. It is a 32-bit register which contains fields

for the specification of the IC manufacturer, the IC part

number and the IC version number. Its biggest advantage

is the possibility to check for the correct ICs mounted after

production and determination of the version number of ICs

during field service.

When the IDCODE instruction is loaded into the BST

instruction register, the identification register will be

connected between TDI and TDO of the IC.

The identification register will load a component specific

code during the CAPTURE_DATA_REGISTER state of

the TAP controller and this code can subsequently be

shifted out. At board level this code can be used to verify

component manufacturer, type and version number.

The device identification register contains 32 bits,

numbered 31 to 0, where bit 31 is the most significant bit

(nearest to TDI) and bit 0 is the least significant bit (nearest

to TDO); see Fig.25.

Fig.25 32 bits of identification code.

handbook, full pagewidth

MHB332

00000010101

0111000100010011

nnnn

4-bit

version

code

16-bit part number

11-bit manufacturer

identification

TDI

TDO

MSB

LSB

28 27

12 11

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