EPCS64 Altera Corporation, EPCS64 Datasheet - Page 18

• Manufacturer Part Number: EPCS64
• Description: (EPCS1 - EPCS64) Serial Configuration Devices
• Manufacturer: Altera Corporation

Serial Configuration Device Memory Access
4–18
Configuration Handbook, Volume 2
Read Silicon ID Operation
The read silicon ID operation code is b'1010 1011, with the MSB listed
first. This operation 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 will be ignored and have no effect on the cycle that is in
progress.
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
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 4–11. Serial Configuration Device Silicon ID
Figure
Serial Configuration Device
4–12. The device can terminate the read silicon ID operation by
Table 4–11
Core Version a.b.c variable
EPCS1
EPCS4
shows the EPCS1 and EPCS4 device silicon IDs.
Silicon ID (Binary Value)
b'0001 0000
b'0001 0010
Altera Corporation
July 2004