EP4CE40 datasheet(183/488 Pages) ALTERA

183 / 488 page

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

8–19

Configuration

May 2013

Altera Corporation

Cyclone IV Device Handbook,

Volume 1

Table 8–8 provides the configuration time for AS configuration.

Enabling compression reduces the amount of configuration data that is sent to the

Cyclone IV device, which also reduces configuration time. On average, compression

reduces configuration time by 50%.

Programming Serial Configuration Devices

Serial configuration devices are non-volatile, flash memory-based devices. You can

program these devices in-system with the USB-Blaster™ or ByteBlaster™ II download

cables. Alternatively, you can program them with the Altera Programming Unit

(APU), supported third-party programmers, or a microprocessor with the SRunner

software driver.

You can perform in-system programming of serial configuration devices through the

AS programming interface. During in-system programming, the download cable

disables device access to the AS interface by driving the nCE pin high. Cyclone IV

devices are also held in reset by a low level on nCONFIG. After programming is

complete, the download cable releases nCE and nCONFIG, allowing the pull-down and

pull-up resistors to drive VCC and GND, respectively.

To perform in-system programming of a serial configuration device through the AS

programming interface, you must place the diodes and capacitors as close as possible

to the Cyclone IV device. You must ensure that the diodes and capacitors maintain a

maximum AC voltage of 4.1 V (Figure 8–6).

1 If you want to use the setup shown in Figure 8–6 to perform in-system programming

of a serial configuration device and single- or multi-device AS configuration, you do

not require a series resistor on the DATA line at the near end of the serial configuration

device. The existing diodes and capacitors are sufficient.

Altera has developed the Serial FlashLoader (SFL), a JTAG-based in-system

programming solution for Altera serial configuration devices. The SFL is a bridge

design for the Cyclone IV device that uses its JTAG interface to access the EPCS JIC

(JTAG Indirect Configuration Device Programming) file and then uses the AS

interface to program the EPCS device. Both the JTAG interface and AS interface are

bridged together inside the SFL design.

f For more information about implementing the SFL with Cyclone IV devices, refer to

AN 370: Using the Serial FlashLoader with the Quartus II Software.

Table 8–8. AS Configuration Time for Cyclone IV Devices (1)

Symbol

Parameter

Cyclone IV E

Cyclone IV GX

Unit

tSU

Setup time

Hold time

tCO

Clock-to-output time

Note to Table 8–8:

(1) For the AS configuration timing diagram, refer to the Serial Configuration (EPCS) Devices Datasheet.

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