ACEX1 datasheet(42/86 Pages) ETC

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Altera Corporation

ACEX 1K Programmable Logic Device Family Data Sheet

IEEE Std.

1149.1 (JTAG)

Boundary-Scan

Support

All ACEX 1K devices provide JTAG BST circuitry that complies with the

IEEE Std. 1149.1-1990 specification. ACEX 1K devices can also be

configured using the JTAG pins through the ByteBlasterMV or BitBlaster

download cable, or via hardware that uses the JamTM Standard Test and

Programming Language (STAPL), JEDEC standard JESD-71. JTAG

boundary-scan testing can be performed before or after configuration, but

not during configuration. ACEX 1K devices support the JTAG

instructions shown in Table 14.

The instruction register length of ACEX 1K devices is 10 bits. The

USERCODE register length in ACEX 1K devices is 32 bits; 7 bits are

determined by the user, and 25 bits are pre-determined. Tables 15 and 16

show the boundary-scan register length and device IDCODE information

for ACEX 1K devices.

Table 14. ACEX 1K JTAG Instructions

JTAG Instruction

Description

SAMPLE/PRELOAD

Allows a snapshot of signals at the device pins to be captured and examined during

normal device operation and permits an initial data pattern to be output at the device

pins.

EXTEST

Allows the external circuitry and board-level interconnections to be tested by forcing a

test pattern at the output pins and capturing test results at the input pins.

BYPASS

Places the 1-bit bypass register between the TDI and TDO pins, allowing the BST data

to pass synchronously through a selected device to adjacent devices during normal

operation.

USERCODE

Selects the user electronic signature (USERCODE) register and places it between the

TDI

and TDO pins, allowing the USERCODE to be serially shifted out of TDO.

IDCODE

Selects the IDCODE register and places it between TDI and TDO, allowing the IDCODE

to be serially shifted out of TDO.

ICR Instructions

These instructions are used when configuring an ACEX 1K device via JTAG ports using

a MasterBlaster, ByteBlasterMV, or BitBlaster download cable, or a Jam File (.jam) or

Jam Byte-Code File (.jbc) via an embedded processor.

Table 15. ACEX 1K Boundary-Scan Register Length

Device

Boundary-Scan Register Length

EP1K10

438

EP1K30

690

EP1K50

798

EP1K100

1,050

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