EP4CE40 datasheet(209/488 Pages) ALTERA

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Chapter 8: Configuration and Remote System Upgrades in Cyclone IV Devices

8–45

Configuration

May 2013

Altera Corporation

Cyclone IV Device Handbook,

Volume 1

JTAG Configuration

JTAG has developed a specification for boundary-scan testing (BST). The BST

architecture offers the capability to efficiently test components on PCBs with tight

lead spacing. The BST architecture can test pin connections without using physical

test probes and capture functional data while a device is normally operating. You can

also use the JTAG circuitry to shift configuration data into the device. The Quartus II

software automatically generates .sof for JTAG configuration with a download cable

in the Quartus II software Programmer.

tCF2ST1

nCONFIG

high to

nSTATUS

high

—

230 (4)

µs

tCF2CK

nCONFIG

high to

first rising edge on

DCLK

230 (3)

—µs

tST2CK

nSTATUS

high to

first rising edge of

DCLK

2—

µs

tDH

Data hold time after

rising edge on

DCLK

0—

tCD2UM

CONF_DONE

high to

user mode (5)

300

650

µs

tCD2CU

CONF_DONE

high to

CLKUSR

enabled

4 × maximum DCLK period

—

tCD2UMC

CONF_DONE

high to

user mode with

CLKUSR option on

tCD2CU + (3,192 × CLKUSR period)

——

tDSU

Data setup time

before rising edge

on DCLK

58—

—

tCH

DCLK

high time

3.2

6.4

—

tCL

DCLK

low time

3.2

6.4

—

tCLK

DCLK

period

7.5

—

fMAX

DCLK

frequency (6)

—

133

MHz

Notes to Table 8–13:

(1) Applicable for Cyclone IV GX and Cyclone IV E with 1.2-V core voltage.

(2) Applicable for Cyclone IV E with 1.0-V core voltage.

(3) This value is applicable if you do not delay configuration by extending the nCONFIG or nSTATUS low pulse width.

(4) This value is applicable if you do not delay configuration by externally holding the nSTATUS low.

(5) The minimum and maximum numbers apply only if you choose the internal oscillator as the clock source for starting the device.

(6) Cyclone IV E devices with 1.0-V core voltage have slower FMAX when compared with Cyclone IV GX devices with 1.2-V core voltage.

Table 8–13. FPP Timing Parameters for Cyclone IV Devices (Part 2 of 2)

Symbol

Parameter

Minimum

Maximum

Unit

Cyclone IV (1)

Cyclone IV E (2)

Cyclone IV (1)

Cyclone IV E (2)

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