DK-DEV-5SGXEA7N【PDF 235/527 页】KIT DEV STRATIX V FPGA 5SGXEA7

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SV51010

2014.01.10

Estimating the Active Serial Configuration Time

8-15

Figure 8-7: Multiple Device AS Configuration When Both Devices in the Chain Receive Different Sets of

Configuration Data

Connect the pull-up resistors to

V CCPGM at a 3.0-V power supply.

V CCPGM

V CCPGM

V CCPGM

10 kΩ

10 kΩ

10 kΩ

V CCPGM

10 kΩ

EPCS or EPCQ Device

FPGA Device Master

nSTATUS

CONF_DONE

nCONFIG

FPGA Device Slave

nSTATUS

CONF_DONE

nCONFIG

nCE

nCEO

nCE

nCEO

N.C.

GND

You can leave the nCEO pin

DATA

AS_DATA1

unconnected or use it as a user I/O

pin when it does not feed another

DCLK

DCLK

MSEL[4..0]

device’s nCE pin.

nCS

ASDI

nCSO

ASDO

CLKUSR

DATA0

DCLK

MSEL [4..0]

(4)

For the appropriate MSEL settings

based on POR delay settings, set

the slave device MSEL setting to the

PS scheme.

Buffers

Connect the repeater buffers between the

FPGA master and slave device for

AS_DATA1 or DATA0 and DCLK for every

fourth device.

For more information, refer to the

MSEL pin settings.

Use the CLKUSR pin to supply the

external clock source to drive DCLK

during configuration.

When a device completes configuration, its nCEO pin is released low to activate the nCE pin of the next device

in the chain. Configuration automatically begins for the second device in one clock cycle.

Estimating the Active Serial Configuration Time

The AS configuration time is mostly the time it takes to transfer the configuration data from an EPCS or

EPCQ device to the Stratix V device.

Use the following equations to estimate the configuration time:

? AS x1 mode

.rbf Size x (minimum DCLK period / 1 bit per DCLK cycle) = estimated minimum configuration time.

? AS x4 mode

.rbf Size x (minimum DCLK period / 4 bits per DCLK cycle) = estimated minimum configuration time.

Compressing the configuration data reduces the configuration time. The amount of reduction varies depending

on your design.

Using EPCS and EPCQ Devices

EPCS devices support AS x1 mode and EPCQ devices support AS x1 and AS x4 modes.

Configuration, Design Security, and Remote System Upgrades in Stratix V Devices

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