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FPGA可编程逻辑器件芯片EP1S20F780C6N中文规格书

FPGA可编程逻辑器件芯片EP1S20F780C6N中文规格书
FPGA可编程逻辑器件芯片EP1S20F780C6N中文规格书

Chapter 11:Configuring Stratix III Devices

Passive Serial Configuration

If the Auto-restart configuration after error option is turned on, the devices release

their nSTATUS pins after a reset time-out period (maximum of 100μs). After all

nSTATUS pins are released and pulled high, the MAX II device can attempt to

reconfigure the chain without needing to pulse nCONFIG low. If this option is turned

off, the MAX II device must generate a low-to-high transition (with a low pulse of at

least 2μs) on nCONFIG to restart the configuration process.

1If 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 10μs to a maximum pulse width of 500μs, as defined in the t STATUS specification.

In your system, you can have multiple devices that contain the same configuration

data. To support this configuration scheme, all device nCE inputs are tied to GND,

while nCEO pins are left floating. All other configuration pins (nCONFIG, nSTATUS,

DCLK, DATA0, and CONF_DONE) are connected to every device in the chain.

Configuration signals can require buffering to ensure signal integrity and prevent

clock skew problems. Ensure that the DCLK and DATA lines are buffered for every

fourth device. Devices must be the same density and package. All devices will start

and complete configuration at the same time. Figure11–15 shows multi-device PS

configuration when both Stratix III devices are receiving the same configuration data. Figure11–15.Multiple-Device PS Configuration When Both Devices Receive the Same Data

Notes to Figure11–15:

(1)Connect the resistor to a supply that provides an acceptable input signal for all Stratix III devices on the chain. V CCPGM must be high enough to

meet the V IH specification of the I/O on the external host. It is recommended to power up all configuration systems’ I/O with V CCPGM.

(2)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 III devices with other

Altera 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 about configurin

g multiple Altera devices in the same

configuration chain, refer to the Configuring Mixed Altera FPGA Chains chapter in the

Configuration Handbook.

Chapter 11:Configuring Stratix III Devices

Passive Serial Configuration

PS Configuration Timing

Figure 11–16 shows the timing waveform for PS configuration when using a MAX II device as an external host.

Table 11–10 defines the timing parameters for Stratix III devices for PS configuration.

Figure 11–16.PS Configuration Timing Waveform (Note 1)

Notes to Figure 11–16:

(1)The beginning of this waveform shows the device in user-mode. In user-mode, nCONFIG , nSTATUS , and CONF_DONE a re at logic high levels.

When nCONFIG is pulled low, a reconfiguration cycle begins.

(2)Upon power-up, the Stratix III device holds nSTATUS low for the time of the POR delay.(3)Upon power-up, before and during configuration, CONF_DONE is low .

(4)Do not leave DCLK floating after configuration. You should drive it high or low, whichever is more convenient. DATA[0] is available as a user

I/O pin after configuration. The state of this pin depends on the dual-purpose pin settings.

(5)Two DCLK falling edges are required after CONF_DONE goes high to begin the initialization of the device.

nCO N FIG

nSTATUS (2)

CO N F_DO N E (3)

DCLK DATA

User I/O

I N IT_DO N

E

t Table 11–10.PS Timing Parameters for Stratix III Devices (Part 1 of 2)

Chapter 11:Configuring Stratix III Devices Passive Serial Configuration

You can use a download cable to configure multiple Stratix III devices by connecting each device's nCEO pin to the subsequent device's nCE pin. The first device's nCE pin is connected to GND while its nCEO pin is connected to the 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. All other configuration pins (nCONFIG , nSTATUS , DCLK , DATA0, and CONF _DONE ) are connected to every device in the chain. Because all CONF _DONE pins are tied together, all devices in the chain initialize and enter user mode at the same time.

In addition, because the nSTATUS pins are tied together, the entire chain halts configuration if any device detects an error. The Auto-restart configuration after error option does not affect the configuration cycle because you must manually restart configuration in the Quartus II software when an error occurs.

Figure 11–17.PS Configuration Using a Download Cable

Notes to Figure 11–17:

(1)You should connect the pull-up resistor to the same supply voltage (V CCPGM ) as the USB-Blaster, MasterBlaster (V IO pin), ByteBlaster II,

ByteBlasterMV, or EthernetBlaster cable.

(2)You only need the pull-up resistors on DATA0 and DCLK if the download cable is the only configuration scheme used on your board. This ensures

that DATA0 and DCLK are not left floating after configuration. For example, if you are also using a configuration device, you do not need the pull-up resistors on DATA0 and DCLK .

(3)Pin 6 of the header is a V IO reference voltage for the MasterBlaster output driver. V IO should match the device's V CCPGM . Refer to the MasterBlaster

Serial/USB Communications Cable Data Sheet for this value. In the USB-Blaster, ByteBlaster II, ByteBlasterMV, or EthernetBlaster cable, this pin is a no connect.

G N D

V

Chapter 11:Configuring Stratix III Devices

Passive Serial Configuration

Figure 11–18 shows how to configure multiple Stratix III devices with a download cable.

f

For more information about how to use the USB-Blaster, MasterBlaster, ByteBlaster II, ByteBlasterMV , or EthernetBlaster cable, refer to the following user guides:

■USB-Blaster USB Port Download Cable User Guide ■MasterBlaster Serial/USB Communications Cable User Guide ■ByteBlaster II Parallel Port Download Cable User Guide ■

ByteBlasterMV Parallel Port Download Cable User Guide ■

EthernetBlaster Download Cable User Guide

Figure 11–18.Multi-Device PS Configuration using a Download Cable

Notes to Figure 11–18:

(1)Connect the pull-up resistor to the same supply voltage (V CCPGM ) as the USB-Blaster, MasterBlaster (V IO pin), ByteBlaster II, ByteBlasterMV, or

EthernetBlaster cable.

(2)You only need the pull-up resistors on DATA0 and DCLK if the download cable is the only configuration scheme used on your board. This is to

ensure that DATA0 and DCLK are not left floating after configuration. For example, if you are also using a configuration device, you do not need the pull-up resistors on DATA0 and DCLK .

(3)Pin 6 of the header is a V IO reference voltage for the MasterBlaster output driver. V IO should match the device's V CCPGM . Refer to the MasterBlaster

Serial/USB Communications Cable Data Sheet for this value. In the USB-Blaster, ByteBlaster II, ByteBlasterMV, or EthernetBlaster cable, this pin is a no connect.

10 k V

MEMORY存储芯片STM32F103C8T6中文规格书

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