EPCS4 datasheet(22/38 Pages) ALTERA

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

Serial Configuration Device Memory Access

Configuration Handbook (Complete Two-Volume Set)

Altera Corporation

Read Silicon ID Operation

The read silicon ID operation code is b'1010 1011, with the MSB listed first. Only

EPCS1, EPCS4, EPCS16, and EPCS64 support this operation. It reads the serial

configuration device’s 8-bit silicon ID from the DATA output pin. If this operation is

shifted in during an erase or write cycle, it is ignored and has no effect on the cycle

that is in progress.

Table 3–14 lists the serial configuration device silicon IDs.

The device implements the read silicon ID operation by driving nCS low then shifting

in the read silicon ID operation code followed by three dummy bytes on ASDI. The

serial configuration device’s 8-bit silicon ID is then shifted out on the DATA pin on the

falling edge of DCLK, as shown in Figure 3–13. The device can terminate the read

silicon ID operation by driving nCS high after the silicon ID has been read at least

once. Sending additional clock cycles on DCLK while nCS is driven low can cause the

silicon ID to be shifted out repeatedly.

Table 3–14. Serial Configuration Device Silicon ID

Serial Configuration Device

Silicon ID (Binary Value)

EPCS1

b'0001 0000

EPCS4

b'0001 0010

EPCS16

b'0001 0100

EPCS64

b'0001 0110

Figure 3–13. Read Silicon ID Operation Timing Diagram (Note 1)

Note to Figure 3–13:

(1) Only EPCS1, EPCS4, EPCS16, and EPCS64 support Read Silicon ID operation.

nCS

DCLK

ASDI

DATA

Operation Code

Three Dummy Bytes

765

210

MSB

High Impedance

Silicon ID

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