EPCS4SI8 Altera, EPCS4SI8 Datasheet - Page 16

• 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

3–16
Configuration Handbook (Complete Two-Volume Set)
Write Disable Operation
The write disable operation code is b'0000 0100, with the MSB listed first. The
write disable operation resets the write enable latch bit, which is bit 1 in the status
register. To prevent the memory from being written unintentionally, the write enable
latch bit is automatically reset when implementing the write disable operation as well
as under the following conditions:
■
■
■
■
■
Figure 3–6
Figure 3–6. Write Disable Operation Timing Diagram
Read Status Operation
The read status operation code is b'0000 0101, with the MSB listed first. You can
use the read status operation to read the status register.
show the status bits in the status register of the serial configuration devices.
Figure 3–7. EPCS4, EPCS16, EPCS64, and EPCS128 Status Register Status Bits
Figure 3–8. EPCS1 Status Register Status Bits
Setting the write in progress bit to 1 indicates that the serial configuration device is
busy with a write or erase cycle. Resetting the write in progress bit to 0 means no
write or erase cycle is in progress.
Power up
Write bytes operation completion
Write status operation completion
Erase bulk operation completion
Erase sector operation completion
shows the timing diagram for the write disable operation.
Chapter 3: Serial Configuration Devices (EPCS1, EPCS4, EPCS16, EPCS64, and EPCS128) Data Sheet
DCLK
DATA
ASDI
nCS
Bit 7
Bit 7
High Impedance
0
1
BP2
Block Protect Bits [2..0]
2
Operation Code
BP1
BP1
Block Protect
3
Bits [1..0]
4
BP0
BP0
5
Write Enable
Write Enable
Latch Bit
Latch Bit
WEL
WEL
6
Serial Configuration Device Memory Access
Progress Bit
Progress Bit
7
Figure 3–7
Write In
Write In
WIP
Bit 0
WIP
Bit 0
© December 2009
and
Figure 3–8
Altera Corporation