Clear-Com PS-10K User Manual download pdf (Page 4)

4 Altera Corporation

AN 59: Conﬁguring FLEX 10K Devices

Figure 2. Conﬁguration EPROM Scheme Circuit

In the Configuration EPROM scheme,

nCONFIG

is usually tied to

VCC

Upon device power-up, the FLEX 10K device senses the low-to-high

transition on

nCONFIG

, which initiates configuration. The FLEX 10K

device drives the open-drain

CONF_DONE

pin low, which drives the

nCS

pin on the EPC1 low. The open-drain

nSTATUS

pin is released by the

FLEX 10K device and pulled high to enable the EPC1. The EPC1 then uses

its internal oscillator to serially clock data from its EPROM cells to the

FLEX 10K device.

If an error occurs during configuration, the FLEX 10K device drives the

nSTATUS

pin low, resetting the EPC1 and internally resetting the

FLEX 10K device. If the

Auto-Restart Configuration on Frame Error

option—

available from the

Global Project Device Options

dialog box (Assign

menu)—is turned on in the MAX+PLUS

II software, the FLEX 10K

device automatically reconfigures if an error occurs. If this option is

turned off, the outside system must monitor

nSTATUS

to detect an error

and then pulse

nCONFIG

low to restart configuration. The outside system

can pulse

nCONFIG

is under system control rather than tied to

VCC

. When configuration is complete, the FLEX 10K device releases

CONF_DONE

, which removes the EPC1 from the circuit.

Multiple FLEX 10K devices can be configured with the Configuration

EPROM scheme. See Figure 3.

FLEX 10K EPC1

DCLK

DATA

nCS

nCONFIG

MSEL0

MSEL1

DCLK

DATA0

nSTATUS

CONF_DONE

nCE

VCC VCC

VCC

GND GND

1 2 3 4 5 6 7 8 9 ... 24 25

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