9–22
Chapter 9: Configuration, Design Security, and Remote System Upgrades in the Cyclone III Device Family
Configuration Features
Figure 9–7 shows the download cable connections to the serial configuration device.
Figure 9–7. In-System Programming of Serial Configuration Devices
V
(1)
V
(1)
V
CCIO
(1)
CCIO
CCIO
10 kΩ
10 kΩ
10 kΩ
Cyclone III Device Family
nSTATUS
CONF_DONE
nCONFIG
nCE
nCEO
N.C. (2)
3.3 V
3.3 V
10 kΩ
3.3 V
Serial
Configuration Device
3.3 V
GND
(6)
DATA
DCLK
nCS
DATA[0] (7)
DCLK (7)
nCSO (5)
ASDI
ASDO (5)
MSEL[3..0]
(4)
Pin 1
3.3 V (3)
GND
GND
10 pf
10 pf
10 pf
ByteBlaster II or USB Blaster
10-Pin Male Header
GND
GND
GND
10 pf
(6)
GND
Notes to Figure 9–7:
(1) Connect these pull-up resistors to the VCCIO supply of the bank in which the pin resides.
(2) The nCEOpin is left unconnected or used as a user I/O pin when it does not feed the nCEpin of another device.
(3) Power up the VCC of the ByteBlaster II or USB-Blaster download cable with the 3.3-V supply.
(4) The MSEL pin settings vary for different configuration voltage standards and POR time. To connect MSEL[3..0], refer to Table 9–7 on page 9–11.
Connect the MSEL pins directly to VCCA or ground.
(5) These are dual-purpose I/O pins. This nCSOpin functions as the FLASH_NCEpin in AP mode. The ASDOpin functions as the DATA[1]pin in other
AP and FPP modes.
(6) The diodes and capacitors must be placed as close as possible to the Cyclone III device family. Ensure that the diodes and capacitors maintain a
maximum AC voltage of 4.1 V. The external diodes and capacitors are required to prevent damage to the Cyclone III device family AS configuration
input pins due to possible overshoot when programming the serial configuration device using a download cable. For effective voltage clamping,
Altera recommends using the Schottky diode, which has a relatively lower forward diode voltage (VF) than the switching and Zener diodes. For
more information about the interface guidelines using Schottky diodes, refer to AN 523: Cyclone III Configuration Interface Guidelines with EPCS
Devices.
(7) When cascading Cyclone III device family in a multi-device AS configuration, connect the repeater buffers between the master and slave devices
for DATA[0]and DCLK. All I/O inputs must maintain a maximum AC voltage of 4.1 V. The output resistance of the repeater buffers must fit the
maximum overshoot equation outlined in “Configuration and JTAG Pin I/O Requirements” on page 9–7.
You can use the Quartus II software with the APU and the appropriate configuration
device programming adapter to program serial configuration devices. All serial
configuration devices are offered in an 8- or 16-pin small outline integrated circuit
(SOIC) package.
Cyclone III Device Handbook
Volume 1
August 2012 Altera Corporation
ALTERA [ ALTERA CORPORATION ]
