VSC8504-02 datasheet(50/131 Pages) MICROSEMI

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Functional Descriptions

VMDS-10507 VSC8504-02 Datasheet Revision 4.2

The following tables provide information about the IDCODE and USERCODE binary values stored in the

device JTAG registers.

The following table provides information about the location and IEEE compliance of the JTAG instruction

codes used in the VSC8504-02. Instructions not explicitly listed in the table are reserved. For more

information about these IEEE specifications, visit the IEEE Web site at www.IEEE.org.

HIGHZ

Places the component in a state in which all of its system logic

outputs are placed in a high-impedance state. In this state, an in-

circuit test system can drive signals onto the connections normally

driven by a component output without incurring a risk of damage to

the component. This makes it possible to use a board where not

all of the components are compatible with the IEEE 1149.1

standard.

IDCODE

Provides the version number (bits 31:28), device family ID (bits

27:12), and the manufacturer identity (bits 11:1) to be serially read

from the device.

SAMPLE/PRELOA

Allows a snapshot of inputs and outputs during normal system

operation to be taken and examined. It also allows data values to

be loaded into the boundary scan cells prior to the selection of

other boundary scan test instructions.

USERCODE

Provides the version number (bits 31:28), part number (bits 27:12),

and the manufacturer identity (bits 11:1) to be serially read from

the device.

Table 13 •

IDCODE JTAG Device Identification Register Descriptions

Description

Device Version

Family ID

Manufacturing Identity

LSB

Bit field

31–28

27–12

11–1

Binary value

0000

1000 0101 0111 0100

000 0111 0100

Table 14 •

USERCODE JTAG Device Identification Register Descriptions

Description

Device Version

Model Number

Manufacturing Identity

LSB

Bit field

31–28

27–12

11–1

Binary value

0010

1000 0101 0111 0100

000 0111 0100

Table 15 •

JTAG Instruction Code IEEE Compliance

Instruction

Code

Selected Register

Width

IEEE 1149.1

EXTEST

6'b000000

Boundary Scan

161

Mandatory

SAMPLE/PRELOA

6'b000001

Boundary Scan

161

Mandatory

IDCODE

6'b100000

Device Identification

Optional

USERCODE

6'b100101

Device Identification

Optional

CLAMP

6'b000010

Bypass Register

Optional

HIGHZ

6'b000101

Bypass Register

Optional

BYPASS

6'b111111

Bypass Register

Mandatory

Table 12 •

JTAG Instruction Codes (continued)

Instruction Code

Description

VSC8504-02 Datasheet(PDF) 50 Page - Microsemi Corporation

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