 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
OR4E04-3BM416C Datasheet(PDF) 11 Page - Lattice Semiconductor |
|
||||||||||||||||||||||||||||||
OR4E04-3BM416C Datasheet(HTML) 11 Page - Lattice Semiconductor |
|
|
11 / 152 page  Lattice Semiconductor 11 Data Sheet May, 2006 ORCA Series 4 FPGAs Programmable Logic Cells (continued) Logic Mode The PFU diagram of Figure 3 represents the logic mode of operation. In logic mode, the eight LUTs are used individually or in flexible groups to implement user logic functions. The latches/FFs may be used in con- junction with the LUTs or separately with the direct PFU data inputs. There are three basic submodes of LUT operation in PFU logic mode: F4 mode, F5 mode, and the F6 mode. Combinations of the submodes are possible in each PFU. F4 mode, shown simplified in Figure 4, illustrates the uses of the basic 4-input LUTs in the PFU. The output of an F4 LUT can be passed out of the PFU, captured at the LUTs associated latch/FF, or multiplexed with the adjacent F4 LUT output using one of the F5[A:D] inputs to the PFU. Only adjacent LUT pairs (K0 and K1, K2 and K3, K4 and K5, K6 and K7) can be multiplexed, and the output always goes to the even-numbered output of the pair. The F5 submode of the LUT operation, shown simpli- fied in Figure 4, indicates the use of 5-input LUTs to implement logic. 5-input LUTs are created from two 4-input LUTs and a multiplexer. The F5 LUT is the same as the multiplexing of two F4 LUTs described previously with the constraint that the inputs to the F4 LUTs be the same. The F5[A:D] input is then used as the fifth LUT input. The equations for the two F4 LUTs will differ by the assumed value for the F5[A:D] input, one F4 LUT assuming that the F5[A:D] input is zero, and the other assuming it is a one. The selection of the appropriate F4 LUT output in the F5 MUX by the F5[A:D] signal creates a 5-input LUT. Any combination of F4 and F5 LUTs is allowed per PFU using the eight 16-bit LUTs. Examples are eight F4 LUTs, four F5 LUTs, and a combination of four F4 plus two F5 LUTs. Two 6-input LUTs are created by shorting together the input of four 4-input LUTs (K0:3 and K4:7) which are multiplexed together. The F5 inputs of the adjacent F4 LUTs derive the fifth and sixth inputs of the F6 mode. The F6 outputs, LUT603 and LUT647, are dedicated to the F6 mode or can be used as the outputs of MUX8x1. MUX8x1 modes are created by programming adjacent 4-input LUTs to 2x1 MUXs and multiplexing down to create MUX8x1. Both F6 mode and MUX8x1 are available in the upper and lower PFU nibbles. 5-9733(F) Figure 4. Simplified F4 and F5 Logic Modes K7_0 K7_1 K7_2 F5D LUT4 LUT4 2x1 MUX F6 K7_3 K6_0 K6_1 K6_2 K6_3 K5_0 K5_1 K5_2 F5C LUT4 LUT4 2x1 MUX F4 K5_3 K4_0 K4_1 K4_2 K4_3 K3_0 K3_1 K3_2 F5B LUT4 LUT4 2x1 MUX F2 K3_3 K2_0 K2_1 K2_2 K2_3 K1_0 K1_1 K1_2 F5A LUT4 LUT4 2x1 MUX F0 K1_3 K0_0 K0_1 K0_2 K0_3 K7 F7 K6 F6 K5 F5 K4 F4 K3 F3 K2 F2 K1 F1 K0 F0 |
Similar Part No. - OR4E04-3BM416C |
|
Similar Description - OR4E04-3BM416C |
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.COM |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
