EP4SE360F35I4 Datasheet, PDF (356/432 Pages) Altera Corporation – This section provides a complete overview of all features relating to the Stratix IV device family, which is the most architecturlly advanced

10–20
Chapter 10: Configuration, Design Security, and Remote System Upgrades in Stratix IV Devices
Fast Active Serial Configuration (Serial Configuration Devices)
Figure 10–7 shows the pin connections for the multi-device fast AS configuration.
Figure 10–7. Multi-Device Fast AS Configuration
V_{CCPGM (1)} V_{CCPGM (1)} V_{CCPGM (1)}
10 kΩ 10 kΩ
10 kΩ
Serial Configuration
Device
DATA
DCLK
nCS
ASDI
GND
Stratix IV Device Master
nSTATUS
CONF_DONE
nCONFIG
nCE
nCEO
DATA0
DCLK
nCSO
ASDO
V_CCPGM
MSEL2
MSEL1
MSEL0
GND
Stratix IV Device Slave
nSTATUS
CONF_DONE nCEO
N.C.
nCONFIG
nCE
DATA0
DCLK
MSEL2
MSEL1
MSEL0
V_CCPGM
GND
Buffers (2)
Notes to Figure 10–7:
(1) Connect the pull-up resistors to V_CCPGM at a 3.0-V supply.
(2) Connect the repeater buffers between the Stratix IV master and slave device(s) for DATA[0] and DCLK. This is to prevent potential signal
integrity and clock skew problems.
As shown in Figure 10–7, the nSTATUS and CONF_DONE pins on all target devices are
connected together with external pull-up resistors. These pins are open-drain
bidirectional pins on the devices. When the first device asserts nCEO (after receiving all
of its configuration data), it releases its CONF_DONE pin. But the subsequent devices in
the chain keep this shared CONF_DONE line low until they have received their
configuration data. When all target devices in the chain have received their
configuration data and have released CONF_DONE, the pull-up resistor drives a high
level on this line and all devices simultaneously enter initialization mode.
If an error occurs at any point during configuration, the nSTATUS line is driven low by
the failing device. If you enable the Auto-restart configuration after error option,
reconfiguration of the entire chain begins after a reset time-out period (a maximum of
500 s). If you did not enable the Auto-restart configuration after error option, the
external system must monitor nSTATUS for errors and then pulse nCONFIG low to
restart configuration. The external system can pulse nCONFIG if it is under system
control rather than tied to V_CCGPM.
1 If you have enabled the Auto-restart configuration after error option, the nSTATUS pin
transitions from high to low and back again to high when a configuration error is
detected. This appears as a low pulse at the nSTATUS pin with a minimum pulse width
of 10 s to a maximum pulse width of 500 s, as defined in the t_STATUS specification.
Stratix IV Device Handbook
Volume 1
September 2012 Altera Corporation