Clear-Com PS-10K User Manual download pdf (Page 5)

Altera Corporation 5

AN 59: Conﬁguring FLEX 10K Devices

Figure 3. Conﬁguration EPROM Scheme Multi-Device Conﬁguration Circuit

The circuit in Figure 3 is similar to the Configuration EPROM scheme

circuit for a single device, except the FLEX 10K devices are cascaded for

multi-device configuration. After the first FLEX 10K device has been

configured, the

nCEO

pin on the first device activates the

nCE

pin on the

second device, prompting the second device to begin configuration. The

CONF_DONE

pins on all the FLEX 10K devices are tied together. Therefore,

the FLEX 10K devices initialize and enter user mode at the same time.

Additionally, the

nSTATUS

lines are tied together; if any device detects an

error, the entire chain is reset for automatic reconfiguration.

EPC1 Configuration EPROMs can also be cascaded for active

configuration of several smaller FLEX 10K devices (e.g., EPF10K10) or one

EPF10K100 device. When all the data from the first EPC1 device has been

sent, the EPC1 drives

nCASC

low, which drives

nCS

on the next EPC1.

Less than one clock cycle is required for one EPC1 device to activate the

next EPC1 for configuration. The stream of data is uninterrupted.

The waveform in Figure 4 shows the timing waveform for the

Configuration EPROM scheme.

Figure 4. Conﬁguration EPROM Scheme Timing Waveform

nCONFIG

nCEO

nCASC

FLEX 10K

Device 1

DCLK

DATA0

CONF_DONE

nSTATUS

nCE

DCLK

DATA

nCS

DCLK

DATA0

CONF_DONE

nSTATUS

nCE

VCC

GND

DCLK

DATA

nCS

FLEX 10K

Device 2

EPC1

Device 1

EPC1

Device 2

MSEL0

MSEL1

GND

MSEL0

MSEL1

GND

n-1

OEZX

DSU

CSH

nCONFIG

OE/nSTATUS

CONF_DONE

DCLK

DATA

1 2 3 4 5 6 7 8 9 10 ... 24 25

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