CDPCLK4 datasheet(222/274 Pages) ALTERA

222 / 274 page

9–64

Chapter 9: Configuration, Design Security, and Remote System Upgrades in the Cyclone III Device Family

Configuration Features

Cyclone III Device Handbook

August 2012

Altera Corporation

Volume 1

ACTIVE_ENGAGE

The ACTIVE_ENGAGE instruction allows you to re-engage a disengaged active controller.

You can issue this instruction any time during configuration or user mode to re-

engage an already disengaged active controller as well as trigger reconfiguration of

the Cyclone III device family in the active configuration scheme specified by the

MSEL pin settings.

The ACTIVE_ENGAGE instruction functions as the PULSE_NCONFIG instruction when the

device is in passive configuration schemes (PS or FPP). The nCONFIG pin is disabled

when the ACTIVE_ENGAGE instruction is issued.

1 Altera does not recommend using the ACTIVE_ENGAGE instruction but it is provided as

a fail-safe instruction for re-engaging the active configuration (AS or AP) controllers.

Changing the Start Boot Address of the AP Flash

In the AP configuration scheme, for Cyclone III devices only, you can change the

default configuration boot address of the parallel flash memory to any desired

address using the APFC_BOOT_ADDR JTAG instruction.

APFC_BOOT_ADDR

The APFC_BOOT_ADDR instruction is for Cyclone III devices only and allows you to

define a start boot address for the parallel flash memory in the AP configuration

scheme.

This instruction shifts in a start boot address for the AP flash. When this instruction

becomes the active instruction, the TDI and TDO pins are connected through a 22-bit

active boot address shift register. The shifted-in boot address bits get loaded into the

22-bit AP boot address update register, which feeds into the AP controller. The content

of the AP boot address update register can be captured and shifted-out of the active

boot address shift register from TDO.

The boot address in the boot address shift register and update register are shifted to

the right (in the LSB direction) by two bits versus the intended boot address. The

reason for this is that the two LSB of the address are not accessible. When this boot

address is fed into the AP controller, two 0s are attached in the end as LSB, thereby

pushing the shifted-in boot address to the left by two bits, which become the actual

AP boot address the AP controller gets.

If you have enabled the remote update feature, the APFC_BOOT_ADDR instruction sets

the boot address for the factory configuration only.

1 The APFC_BOOT_ADDR instruction is retained after reconfiguration while the system

board is still powered on. However, you must reprogram the instruction whenever

you restart the system board.

Device Configuration Pins

Table 9–21 through Table 9–23 describe the connections and functionality of all the

configuration-related pins on Cyclone III device family.

CDPCLK4 Scheda tecnica(PDF) 222 Page - Altera Corporation

CDPCLK4 Scheda tecnica(HTML) 222 Page - Altera Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Scheda tecnica Scarica

Link URL