EP2S130F1020I4 Datasheet, PDF (571/768 Pages) List of Unclassifed Manufacturers – Stratix II Device Handbook, Volume 1

Configuring Stratix II and Stratix II GX Devices
1 If the optional CLKUSR pin is used and nCONFIG is pulled low
to restart configuration during device initialization, you need to
ensure CLKUSR continues toggling during the time nSTATUS is
low (maximum of 100 µs).
When the device is in user-mode, initiating a reconfiguration is done by
transitioning the nCONFIG pin low-to-high. The nCONFIG pin should be
low for at least 2 µs. When nCONFIG is pulled low, the device also pulls
nSTATUS and CONF_DONE low and all I/O pins are tri-stated. Once
nCONFIG returns to a logic high level and nSTATUS is released by the
device, reconfiguration begins.
Figure 7–4 shows how to configure multiple devices using a MAX II
device. This circuit is similar to the FPP configuration circuit for a single
device, except the Stratix II or Stratix II GX devices are cascaded for
multi-device configuration.
Figure 7–4. Multi-Device FPP Configuration Using an External Host
Memory
ADDR DATA[7..0]
External Host
(MAX II Device or
Microprocessor)
VCC (1) VCC (1)
10 kΩ
10 kΩ
GND
Stratix II Device 1
MSEL[3..0]
CONF_DONE
nSTATUS
GND
nCE
nCEO
DATA[7..0]
nCONFIG
DCLK
Stratix II Device 2
MSEL[3..0]
CONF_DONE
nSTATUS
GND
nCE
nCEO N.C.
DATA[7..0]
nCONFIG
DCLK
Note to Figure 7–4:
(1) The pull-up resistor should be connected to a supply that provides an acceptable input signal for all devices in the
chain. V_CC should be high enough to meet the V_IH specification of the I/O standard on the device and the external
host.
In multi-device FPP configuration, the first device’s nCE pin is connected
to GND while its nCEO pin is connected to nCE of the next device in the
chain. The last device’s nCE input comes from the previous device, while
its nCEO pin is left floating. After the first device completes configuration
in a multi-device configuration chain, its nCEO pin drives low to activate
the second device’s nCE pin, which prompts the second device to begin
configuration. The second device in the chain begins configuration within
one clock cycle; therefore, the transfer of data destinations is transparent
to the MAX II device. All other configuration pins (nCONFIG, nSTATUS,
DCLK, DATA[7..0], and CONF_DONE) are connected to every device in
Altera Corporation
January 2008
7–19
Stratix II Device Handbook, Volume 2