AT94K datasheet(21/192 Pages) ATMEL

21 / 192 page

AT94K Series FPSLIC

Rev. 1138F–FPSLI–06/02

FPGA/AVR Interface and System Control

The FPGA and AVR share a flexible interface which allows for many methods of system

integration.

•

Both FPGA and AVR share access to the 15 ns dual-port SRAM.

•

The AVR data bus interfaces directly into the FPGA busing resources, effectively treating

the FPGA as a large I/O device. Users have complete flexibility on the types of additional

peripherals which are placed and routed inside the FPGA user logic.

•

Up to 16 decoded address lines are provided into the FPGA.

•

Up to 16 interrupts are available from the FPGA to the AVR.

•

The AVR can reprogram the FPGA during operation to create a dynamic reconfigurable

system (Cache Logic).

FPGA/AVR

Interface–

Memory-mapped

Peripherals

The FPGA core can be directly accessed by the AVR core, see Figure 18. Four memory loca-

tions in the AVR memory map are decoded into 16 select lines (8 for AT94K05) and are

presented to the FPGA along with the AVR 8-bit data bus. The FPGA can be used to create

additional custom peripherals for the AVR microcontroller through this interface. In addition

there are 16 interrupt lines (8 for AT94K05) from the FPGA back into the AVR interrupt control-

ler. Programmable peripherals or regular logic can use these interrupt lines. Full support for

programmable peripherals is available within the System Designer tool suite.

Figure 18. FPGA/AVR Interface: Interrupts and Addressing

The FPGA I/O selection is controlled by the AVR. This is described in detail beginning on

page 53. The FPGA I/O interrupts are described beginning on page 57.

EMBEDDED

FPGA CORE

EMBEDDED

AVR CORE

ADDRESS

DECODER

4:16

DECODE

Up to 16 Memory-mapped

Decoded Address

Lines from 4 I/O Memory

Space Addresses

I/O Memory Address Bus

FPGAIORE

FPGAIOWE

Up to 16 Interrupt Lines from FPGA to AVR – Various Priority Levels

8-bit Bi-directional Data Bus

8-bit

Data Out

8-bit

Data In

AT94K Datasheet(PDF) 21 Page - ATMEL Corporation

AT94K Datasheet(HTML) 21 Page - ATMEL Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL