ep2sgx60e Altera Corporation, ep2sgx60e Datasheet - Page 30

• Manufacturer Part Number: ep2sgx60e
• Description: 4. Serial Configuration Devices Epcs1, Epcs4, Epcs16, Epcs64, And Epcs128 Data Sheet
• Manufacturer: Altera Corporation

Serial Configuration Device Memory Access
Figure 4–13. Read Device Identification Operation Timing Diagram
Note to
(1)
4–30
Configuration Handbook, Volume 2
DCLK
DATA
ASDI
nCS
Only EPCS128 supports read device identification operation.
Figure
0
High Impedance
1
4–13:
2
Operation Code
3
4
5
6
The device implements the read device identification operation by
driving nCS low then shifting in the read device identification operation
code followed by one dummy byte on ASDI. The serial configuration
device’s 16-bit device identification is then shifted out on the DATA pin on
the falling edge of DCLK, as shown in
terminate the read device identification operation by driving nCS high
after reading the device identification at least once.
Write Bytes Operation
The write bytes operation code is b'0000 0010, with the MSB listed
first. The write bytes operation allows bytes to be written to the memory.
The write enable operation must be executed prior to the write bytes
operation to set the write enable latch bit in the status register to 1.
The write bytes operation is implemented by driving nCS low, followed
by the write bytes operation code, three address bytes and a minimum
one data byte on ASDI. If the eight least significant address bits
(A[7..0]) are not all 0, all sent data that goes beyond the end of the
current page is not written into the next page. Instead, this data is written
at the start address of the same page (from the address whose eight LSBs
are all 0). Drive nCS low during the entire write bytes operation sequence,
as shown in
Table 4–22. Serial Configuration Device Identification
7
MSB
7
8
Serial Configuration Device
6
9
5
10
Dummy Byte 1
4
11
Figure
EPCS128
12
3
2
13
4–14.
1
14
0
15
MSB
7
16
6
17
5
18
Dummy Byte 2
19
4
Note (1)
3
20
Figure
2
21
1
22
Silicon ID (Binary Value)
4–13. The device can
0
23
MSB
b'0001 1000
7
24
6
25
5
26
Altera Corporation
Silicon ID
4
27
3
28
2
29
May 2008
1
30
0
31