EP2AGX95EF29C6N Datasheet, PDF (307/380 Pages) Altera Corporation – Device Interfaces and Integration

Chapter 9: Configuration, Design Security, and Remote System Upgrades in Arria II Devices
AS and Fast AS Configuration (Serial Configuration Devices)
9–21
Figure 9–7 shows the pin connections for the multi-device AS configuration.
Figure 9–7. Multi-Device AS Configuration
V_CCIO/V_CCPGM V_CCIO/V_CCPGM V_CCIO/V_CCPGM
(1)
(1)
(1)
10 kΩ 10 kΩ 10 kΩ
Serial Configuration
Device
DATA
DCLK
nCS
ASDI
GND
Arria II Device Master
nSTATUS
CONF_DONE
nCONFIG
nCE
V_CCIO/V_{CCPGM (1)}
Arria II Device Slave
nSTATUS
CONF_DONE
nCONFIG
nCEO
DATA[0]
DCLK
nCSO
ASDO
nCEO
CLKUSR
MSEL [n..0]
10 kΩ
(2)
(3)
nCE
DATA[0]
DCLK
MSEL [n..0]
N.C.
(3)
Buffers (4)
Notes to Figure 9–7:
(1) Connect the pull-up resistors to the V_CCIO power supply of the I/O bank 3C for Arria II GX devices and to V_CCPGM at a 3.0-V power supply for
Arria II GZ devices.
(2) Arria II devices have an option to select CLKUSR (40 MHz maximum) as the external clock source for DCLK.
(3) The MSEL pin settings vary for different configuration voltage standards and POR delay. To connect MSEL[3..0]for an Arria II GX device, refer to
Table 9–6 on page 9–9. To connect MSEL[2..0] for an Arria II GZ device, refer to Table 9–7 on page 9–10.
(4) Connect the repeater buffers between the Arria II master and slave devices for DATA[0] and DCLK. This is to prevent any potential signal integrity
and clock skew problems.
The timing parameters for AS mode are not listed here because the t_CF2CD, t_CF2ST0, t_CFG,
t_STATUS, t_CF2ST1, and t_CD2UM timing parameters are identical to the timing parameters
for PS mode listed in Table 9–12 on page 9–29.
As shown in Figure 9–7, 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
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.
1 While you can cascade Arria II devices, you cannot cascade or chain together serial
configuration devices.
July 2012 Altera Corporation
Arria II Device Handbook Volume 1: Device Interfaces and Integration