EPCS4SI8 Altera, EPCS4SI8 Datasheet - Page 20

• Manufacturer Part Number: EPCS4SI8
• Description: IC CONFIG DEVICE 4MBIT 8-SOIC
• Manufacturer: Altera
• Series: EPCSr

Specifications of EPCS4SI8

• Programmable Type: In System Programmable
• Memory Size: 4Mb
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 544-1243-5

3–20
Figure 3–11. Read Bytes Operation Timing Diagram
Notes to
(1) Address bit A[23] is a don't-care bit in EPCS64. Address bits A[23..21] are don't-care bits in EPCS16. Address bits A[23..19] are don't-
(2) For .rpd files, the read sequence shifts out the LSB of the data byte first.
Configuration Handbook (Complete Two-Volume Set)
care bits in EPCS4. Address bits A[23..17] are don't-care bits in the EPCS1.
Figure
DCLK
DATA
ASDI
nCS
3–11:
Read Bytes Operation
The read bytes operation code is b'0000 0011, with the MSB listed first. To read the
memory contents of the serial configuration device, the device is first selected by
driving nCS low. Then, the read bytes operation code is shifted in followed by a 3-byte
address (A[23..0]). Each address bit must be latched in on the rising edge of the
DCLK. After the address is latched in, the memory contents of the specified address
are shifted out serially on the DATA pin, beginning with the MSB. For reading Raw
Programming Data files (.rpd), the content is shifted out serially beginning with the
LSB. Each data bit is shifted out on the falling edge of DCLK. The maximum DCLK
frequency during the read bytes operation is 20 MHz.
diagram for the read bytes operation.
The first byte address can be at any location. The device automatically increments the
address to the next higher address after shifting out each byte of data. Therefore, the
device can read the whole memory with a single read bytes operation. When the
device reaches the highest address, the address counter restarts at 0x000000,
allowing the memory contents to be read out indefinitely until the read bytes
operation is terminated by driving nCS high. The device can drive nCS high any time
after data is shifted out. If the read bytes operation is shifted in while a write or erase
cycle is in progress, the operation is not executed and has no effect on the write or
erase cycle in progress.
0
High Impedance
1
2
Operation Code
3
Chapter 3: Serial Configuration Devices (EPCS1, EPCS4, EPCS16, EPCS64, and EPCS128) Data Sheet
4
5
6
7
MSB
23
8
22
9
21
10
24-Bit Address (1)
3
28
2
29
1
30
0
31
MSB (2)
7
32
6
33
Figure 3–11
Serial Configuration Device Memory Access
5
34
DATA Out 1
© December 2009
4
35
3
36
2
37
shows the timing
1
38
0
39
DATA Out 2
7
Altera Corporation