atf280e ATMEL Corporation, atf280e Datasheet - Page 32

• Manufacturer Part Number: atf280e
• Description: Rad Hard Reprogrammable Fpga
• Manufacturer: ATMEL Corporation

9. ATF280E Configuration
9.1
9.2
32
Mode
0
1
7
2
6
4
Entering Configuration Modes
Configuration Modes
ATF280E
Synchronous RAM
Slave Parallel
Slave Parallel
Master Serial
Description
Slave Serial
Slave Serial
Configuration is the process by which a design is loaded into an ATF280E FPGA. The ATF280E
device is a SRAM based FPGA. this lead to an unlimited reprogrammability capability.
It is possible to configure either the entire device or only a portions of the device. Sections can
be configured while others continue to operate undisturbed. The architecture of the ATF280E
leads to a maximum bitstream size of 3M bits. It is possible to store configuration bit-streams of
the ATF280E in one single 4Mbit EEPROM.
Full configuration takes only milliseconds. Partial configuration takes even less time and is a
function of design density.
Configuration data is transferred to the device in one of the six modes supported by the
ATF280E. Three dedicated input pins, M0, M1, and M2 are used to determine the configuration
mode.
The ATF280E supports an auto-configuring Master mode, four Slave modes, and a Synchro-
nous RAM Mode for accessing the SRAM-based configuration memory directly from a parallel
microprocessor port.
The following table summarizes the ATF280E configuration modes.
Table 9-1.
In order to keep the maximum number of pins assigned to signals, it is recommended to use a
serial configuration interface. Here is an example of ATF280E serial configuration architecture.
Configuration Modes
M2
0
0
0
1
1
M1
0
0
1
1
1
0
M0
0
1
1
0
0
0
Output
CCLK
Input
Input
Input
Input
Input
8 or 16 bit word
8 or 16 bit word
8 or 16 bit word
Serial
Serial
Serial
Data
Parallel Port of Microprocessor
20-bit address out, Parallel
Auto-Configuration Serial
Microprocessor or
Microprocessor or
Microprocessor or
parallel EEPROM
24-bit Address In,
Serial EEPROM
Serial EEPROM
EEPROM
EPROM
Notes
7750A–AERO–07/07