EP4CE40 datasheet(201/488 Pages) ALTERA

201 / 488 page

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

8–37

Configuration

May 2013

Altera Corporation

Cyclone IV Device Handbook,

Volume 1

PS Configuration Using a Download Cable

In this section, the generic term “download cable” includes the Altera USB-Blaster

USB port download cable, MasterBlaster™ serial and USB communications cable,

ByteBlaster II parallel port download cable, the ByteBlasterMV™ parallel port

download cable, and the EthernetBlaster communications cable.

In the PS configuration with a download cable, an intelligent host (such as a PC)

transfers data from a storage device to the Cyclone IV device through the download

cable.

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

—

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 8–12:

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

(2) Applicable for Cyclone IV E devices 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 8–12. PS Configuration 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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