
7–80
Altera Corporation
Stratix II Device Handbook, Volume 2
January 2008
Passive Parallel Asynchronous Configuration
All devices start and complete configuration at the same time.
Figure 7–32 shows multi-device PPA configuration when both devices are
receiving the same configuration data.
Figure 7–32. Multiple-Device PPA Configuration Using a Microprocessor When Both devices Receive the
Same Data
(1)
If not used, the CS pin can be connected to VCC directly. If not used, the nCS pin can be connected to GND directly.
(2)
The pull-up resistor should be connected to a supply that provides an acceptable input signal for all devices in the
chain. VCC should be high enough to meet the VIH specification of the I/O on the device and the external host.
(3)
The nCEO pins of both devices are left unconnected when configuring the same configuration data into multiple
devices.
You can use a single configuration chain to configure Stratix II or
Stratix II GX devices with other Altera devices that support PPA
configuration, such as Stratix, Mercury, APEX 20K, ACEX 1K, and
FLEX 10KE devices. To ensure that all devices in the chain complete
configuration at the same time or that an error flagged by one device
initiates reconfiguration in all devices, all of the device CONF_DONE and
nSTATUS
pins must be tied together.
f
For more information on configuring multiple Altera devices in the same
chapter in volume 2 of the Configuration Handbook.
GND
VCC
Address Decoder
ADDR
Memory
DATA[7..0]
nCS (1)
CS (1)
CONF_DONE
nSTATUS
nCE
nWS
nRS
nCONFIG
RDYnBSY
nCS (1)
CS (1)
CONF_DONE
nSTATUS
nCE
nWS
nRS
nCONFIG
RDYnBSY
Microprocessor
DATA[7..0]
VCC
DATA[7..0]
nCEO
N.C. (3)
nCEO
(2)
DCLK
VCC (2)
DCLK
(2)
VCC
Stratix II Device
10 k
Ω
10 k
Ω
10 k
Ω
10 k
Ω
N.C. (3)
GND
MSEL3
MSEL2
MSEL1
MSEL0
VCC
GND
MSEL3
MSEL2
MSEL1
MSEL0
VCC
GND