www.austriamicrosystems.com/Interfaces-LVDS/AS1160_61

Revision 1.01

26 - 29

AS1160/AS1161

Datasheet - A p p l i c a t i o n I n f o r m a t i o n

JTAG Test Modes

Instructions supported by the AS1160/AS1161 and its respective operational binary codes are shown in Table 12.

Note: Boundary Scan Description Language (BSDL) model files for the AS1160 and the AS1161 are available on the

internet.

SAMPLE/PRELOAD

This is a mandatory instruction for the IEEE 1149.1 specification that supports two functions. The digital I/Os of the

device can be sampled at the boundary scan test data register without interfering with the normal operation of the

device. SAMPLE/PRELOAD also allows the device to shift data into the boundary scantest data register through TDI.

BYPASS

When the BYPASS instruction is latched into the instruction register, TDI connects to TDO through the 1-bit bypass

test data register. This allows data to pass from TDI to TDO without affecting the device’s normal operation.

EXTEST

Implemented at LVDS levels as a go/no-go test (e.g. missing cables).

IDCODE

The AS1160/AS1161 ID code is provided to the TDO output.

RUNBIST

An at-system-speed interconnect test instruction. It is executed in approximately 33mS (@ 66MHz system speed).

There are two bits in the RX BIST data register for notification of PASS/FAIL and TEST_COMPLETE. Pass indicates

that the BER (bit-error-rate) is better than 10

-7

.

If both the AS1160 and the AS1161 have loaded the RUNBIST instruction into their instruction registers, both devices

must move into the RTI state within 4K system clocks (at a SCLK of 66Mhz and TCK of 1MHz this allows for 66 TCK

cycles). This is only an issue when both devices are not on the same scan chain or LSP, although, it can be a problem

with some multi-drop devices.

Table 12. Instruction Codes

Instruction

Code

SAMPLE/PRELOAD

0101

BYPASS

1111

EXTEST

0001

IDCODE

1010

RUNBIST

1110

Table 13. 32bit ID Code

MSB

LSB

Device

Version (4bits)

Device ID (16bits)

Manufacturer ID (11bits)

Fixed Value (1bit)

AS1160

0100

0001000101100000

01011011010

1

AS1161

0100

0001000101100001

01011011010

1