EPC1441 datasheet(13/36 Pages) ALTERA

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Altera Corporation

Configuration Devices for SRAM-Based LUT Devices Data Sheet

When configuring APEX II, APEX 20K, Mercury, ACEX 1K, and

FLEX 10K devices with cascaded EPC2 or EPC1 devices, the position of

the EPC2 or EPC1 device in the chain determines its operation. Similarly,

when configuring FLEX 6000 devices with cascaded EPC1 devices, the

position of the EPC1 device in the chain determines its operation. When

the first or master device in a configuration device chain is powered-up or

reset and the nCS pin is driven low, the master device controls

configuration. The master device supplies all clock pulses to one or more

LUT-based PLDs and to any subsequent slave devices during

configuration. The master EPC2 or EPC1 device also provides the first

stream of data to the LUT-based PLD during multi-device configuration.

After the master EPC2 or EPC1 device finishes sending configuration

data, the master EPC2 or EPC1 device drives its nCASC pin low, which

drives the nCS pin of the first slave EPC2 or EPC1 device low. This action

causes the slave EPC2 or EPC1 device to send configuration data to the

LUT-based PLDs.

The master EPC2 or EPC1 device clocks all subsequent slave devices until

configuration is complete. Once all configuration data is transferred and

the nCS pin on the master EPC2 or EPC1 device is driven high by the LUT-

based PLD’s CONF_DONE pin, the master EPC2 or EPC1 device clocks 16

additional cycles to initialize the LUT-based PLD(s). The master EPC2 or

EPC1 device then goes into zero-power (idle) state. If nCS on the master

EPC2 or EPC1 device is driven high before all configuration data is

transferred, or if nCS is not driven high after all configuration data is

transferred, the master EPC2 or EPC1 device drives the APEX 20K,

Mercury, ACEX 1K, and FLEX device’s nSTATUS pin low, indicating a

configuration error.

Configuration automatically restarts if the project is compiled with the

Auto-Restart Configuration on Frame Error option turned on in the

MAX+PLUS II software’s Global Project Device Options dialog box

(Assign menu).

Figure 5 shows an APEX II, APEX 20K, Mercury, ACEX 1K, FLEX 10K, or

FLEX 6000 device configured with two EPC2 or EPC1 devices. Additional

EPC2 or EPC1 devices can be added by connecting nCASC to nCS of the

subsequent slave EPC2 or EPC1 device in the chain and connecting DCLK,

DATA

, and OE in parallel.

A mixture of APEX 20K, Mercury, ACEX 1K, FLEX 10K, and

FLEX 6000 devices can be configured in the same chain. A

mixture of FLEX 10K, FLEX 10KA, FLEX 10KE, and 5.0-V and

3.3-V FLEX 6000 devices can be configured in the same chain. See

“Configuration Chain with Multiple Voltage Levels” on page 25.

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