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EPCS16SI16N 数据表(PDF) 23 Page - Altera Corporation

部件名 EPCS16SI16N
功能描述  Serial Configuration Devices
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制造商  ALTERA [Altera Corporation]
网页  http://www.altera.com
标志 ALTERA - Altera Corporation

EPCS16SI16N 数据表(HTML) 23 Page - Altera Corporation

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Chapter 3: Serial Configuration Devices (EPCS1, EPCS4, EPCS16, EPCS64, and EPCS128) Data Sheet
3–23
Serial Configuration Device Memory Access
© December 2009
Altera Corporation
Configuration Handbook (Complete Two-Volume Set)
Read Device Identification Operation
The read device identification operation code is b’1001 1111, with the MSB listed
first. Only EPCS128 supports this operation. It reads the serial configuration device’s
8-bit device identification 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 3–15 shows the serial configuration device identification.
The device implements the read device identification operation by driving nCS low
then shifting in the read device identification operation code followed by two 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 Figure 3–14. The
device can 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
Figure 3–15.
If more than 256 data bytes are shifted into the serial configuration device with a write
bytes operation, the previously latched data is discarded and the last 256 bytes are
written to the page. However, if less than 256 data bytes are shifted into the serial
configuration device, they are guaranteed to be written at the specified addresses and
the other bytes of the same page are unaffected.
Table 3–15. Serial Configuration Device Identification
Serial Configuration Device
Silicon ID (Binary Value)
EPCS128
b'0001 1000
Figure 3–14. Read Device Identification Operation Timing Diagram (Note 1)
Note to Figure 3–14:
(1) Only EPCS128 supports read device identification operation.
nCS
DCLK
ASDI
DATA
0
1
2
3
4
5
6
7
8
9
10
20
21
23
24
25
26
27
28
29
30
31
32
Operation Code
Two Dummy Bytes
15
14
13
321
0
765
43
210
MSB
MSB
High Impedance
Silicon ID


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