Altera Cyclone IV Device Handbook page 184

8–20
f
For more information about the USB-Blaster download cable, refer to the
Download Cable User
cable, refer to the
Figure 8–6
Figure 8–6. In-System Programming of Serial Configuration Devices
Serial
Configuration Device
Notes to Figure 8–6:
(1) Connect these pull-up resistors to the V
(2) The nCEO pin is left unconnected or used as a user I/O pin when it does not feed the nCE pin of another device.
(3) Power up the V of the ByteBlaster II or USB-Blaster download cable with the 3.3-V supply.
CC
(4) The MSEL pin settings vary for different configuration voltage standards and POR time. To connect the MSEL pins, refer to
Table 8–4 on page 8–8, and Table 8–5 on page
(5) The diodes and capacitors must be placed 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. The external diodes and capacitors are required to prevent damage to the Cyclone IV device AS configuration
input pins due to possible overshoot when programming the serial configuration device with a download cable. Altera recommends using the
Schottky diode, which has a relatively lower forward diode voltage (VF) than the switching and Zener diodes, for effective voltage clamping.
(6) When cascading Cyclone IV devices 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
(7) These pins are dual-purpose I/O pins. The nCSO pin functions as FLASH_nCE pin in AP mode. The ASDO pin functions as DATA[1] pin in AP and
FPP modes.
(8) Only Cyclone IV GX devices have an option to select CLKUSR (40 MHz maximum) as the external clock source for DCLK.
Cyclone IV Device Handbook,
Volume 1
Chapter 8: Configuration and Remote System Upgrades in Cyclone IV Devices
Guide. For more information about the ByteBlaster II download
ByteBlaster II Download Cable User
shows the download cable connections to the serial configuration device.
(1) (1)
V V
CCIO CCIO
10 kΩ 10 kΩ 10 kΩ
3.3 V
10 kΩ
3.3 V
GND
(5)
DATA
DCLK
nCS
ASDI
10 pf
GND
(5) GND
supply of the bank in which the pin resides.
CCIO
8–9. Connect the MSEL pins directly to V
"Configuration and JTAG Pin I/O Requirements" on page
Guide.
(1)
V
CCIO
Cyclone IV Device
nSTATUS
CONF_DONE
nCONFIG
nCE
3.3 V
3.3 V
DATA[0] (6)
DCLK (6)
nCSO (7)
ASDO (7)
Pin 1
10 pf
10 pf
ByteBlaster II or USB Blaster
10-Pin Male Header
GND
GND
10 pf
or GND.
CCA
8–5.
Configuration
USB-Blaster
nCEO N.C. (2)
(8)
CLKUSR
MSEL[ ] (4)
3.3 V (3)
GND
GND
Table 8–3 on page
May 2013 Altera Corporation
8–8,