3–6

　　　　

Chapter 3: Serial Configuration Devices (EPCS1, EPCS4, EPCS16, EPCS64, and EPCS128) Data Sheet

Active Serial FPGA Configuration

Configuration Handbook (Complete Two-Volume Set)

© December 2009

Altera Corporation

Multiple devices can be configured by a single EPCS device. However, serial

configuration devices cannot be cascaded. Refer to Table 3–1 to ensure the

programming file size of the cascaded FPGAs does not exceed the capacity of a serial

configuration device. Figure 3–4 shows the AS configuration scheme with multiple

FPGAs in the chain. The first FPGA is the configuration master and has its MSEL[]

pins set to AS mode. The following FPGAs are configuration slave devices and have

their MSEL[] pins set to PS mode.

Figure 3–4. Multiple Devices in AS Mode (Note 1), (5)

Notes to Figure 3–4:

(2) Serial configuration devices cannot be cascaded.

(3) Connect the FPGA MSEL[] input pins to select the AS configuration mode. For details, refer to the appropriate FPGA family chapter in the

Configuration Handbook.

(4) Connect the FPGA MSEL[] input pins to select the PS configuration mode. For details, refer to the appropriate FPGA family chapter in the

Configuration Handbook.

(5) For more information about configuration pin I/O requirements in an AS scheme for an Altera FPGA, refer to the respective FPGA family handbook

Configuration chapter.

DATA

DCLK

nCS

ASDI

DATA0

DCLK

nCSO

nCE

nCONFIG

nSTATUS

MSEL[]

nCEO

CONF_DONE

ASDO

10 k



10 k



10 k



(3)

Altera FPGA (Master)

DATA0

DCLK

nCE

nCONFIG

nSTATUS

MSEL[ ]

nCEO

CONF_DONE

(4)

Altera FPGA (Slave)

Serial

Configuration

Device (2)

N.C.