Tutorial FTL. Sejun Kwon Computer Systems Laboratory Sungkyunkwan University
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1 Tutorial FTL Sejun Kwon Computer Systems Laboratory Sungkyunkwan University
2 Contents NAND Flash Memory NAND Flash Operation NAND Flash Architecture NAND Controller Tutorial FTL ICE3028: Embedded Systems Design (Spring 2014) Jin-Soo Kim 2
3 NAND Flash Memory K9LCG08U1M (Dual die) Samsung 35 nm 2-bit MLC flash 16 sectors per page (8 KB B) 128 pages per block (1 MB + 80 KB) blocks per die Page read : 250 us Page program : 1.3 ms Block erase : 1.5 ms ICE3028: Embedded Systems Design (Spring 2014) Jin-Soo Kim (jinsookim@skku.edu) 3
4 NAND Flash Memory NAND Flash Code Information onductor/support/label-code-info/codeinfo/memory-component ICE3028: Embedded Systems Design (Spring 2014) Jin-Soo Kim 4
5 Plane 0 Plane 1 Die 0 ( Low ) Die 1 ( High ) NAND Flash Memory NAND Flash Organization Block Page Buffer Page Buffer ICE3028: Embedded Systems Design (Spring 2014) Jin-Soo Kim (jinsookim@skku.edu) 5
6 NAND Flash Memory NAND Flash Organization Data (8KB) Spare (640B) Page (8KB + 640B) Block (1MB + 80KB) ICE3028: Embedded Systems Design (Spring 2014) Jin-Soo Kim (jinsookim@skku.edu) 6
7 NAND Flash Operation Page read Cell -> Page Buffer -> RAM Page program RAM -> Page Buffer -> Cell Page copy-back Cell (Src) -> Page Buffer -> Cell (Dst) Block erase ICE3028: Embedded Systems Design (Spring 2014) Jin-Soo Kim 7
8 4 Channel NAND Flash Configuration Channel / Way 8 Way ICE3028: Embedded Systems Design (Spring 2014) Jin-Soo Kim (jinsookim@skku.edu) 8
9 NAND Flash Configuration Jasmine Firmware abstracts channel and way to bank 4way * 2 channel = 8 banks bank number = physical page number % number of banks Each bank has blocks ICE3028: Embedded Systems Design (Spring 2014) Jin-Soo Kim (jinsookim@skku.edu) 9
10 NAND Flash Configuration Banks share the same IO bus Each bank can perform cell operation in parallel Cell to Page Buffer operation, Block erase Barefoot has only 4 R/B signal inputs per channel A0 and A4 are tied together Maximum 4 way interleaving ICE3028: Embedded Systems Design (Spring 2014) Jin-Soo Kim (jinsookim@skku.edu) 10
11 NAND Flash Configuration Ch C/D Bank 3(7) Ch C/D Bank 1(5) Ch A/B Bank 0(4) Ch A/B Bank 2(6) Ch A/B Bank 1(5) Ch A/B Bank 3(7) Ch C/D Bank 2(6) Ch C/D Bank 0(4) ICE3028: Embedded Systems Design (Spring 2014) Jin-Soo Kim 11
12 NAND Flash Configuration 2 Plane operation, 16 bit IO program AA 16KB Die 0 (Low) 16KB Die 1 (High) Plane 0 Plane 1 Plane 0 Plane AA.. Block 0 Block 1 Block 0 Block ICE3028: Embedded Systems Design (Spring 2014) Jin-Soo Kim (jinsookim@skku.edu) 12
13 NAND Flash Controller To issue NAND Flash operation Defined in./include/flash.h FC_COL_ROW_READ_OUT FC_COL_ROW_IN_PROG FC_COPYBACK FO_P FO_E FO_B_SATA_W FO_B_SATA_R ICE3028: Embedded Systems Design (Spring 2014) Jin-Soo Kim 13
14 NAND Flash Controller To issue NAND Flash operation ICE3028: Embedded Systems Design (Spring 2014) Jin-Soo Kim 14
15 Tutorial FTL./ftl_tutorial ftl.c, ftl.h Page Mapping FTL Write data from DRAM to NAND Read data from NAND to DRAM But no garbage collection ICE3028: Embedded Systems Design (Spring 2014) Jin-Soo Kim 15
16 Page Mapping Table LPN to PPN map LPN: Logical Page Number - LPN = LBA / Sectors Per Page PPN: Physical Page Number Index Value INVALID ICE3028: Embedded Systems Design (Spring 2014) Jin-Soo Kim (jinsookim@skku.edu) 16
17 Read Operation ICE3028: Embedded Systems Design (Spring 2014) Jin-Soo Kim 17
18 ./ftl_tutorial/ftl.c Write Operation ICE3028: Embedded Systems Design (Spring 2014) Jin-Soo Kim 18
19 Write Operation NAND Old Page (32KB) For Partial Write DRAM Left hole read Write Write hole read For Not In-Place Update NAND New Page (32KB) ICE3028: Embedded Systems Design (Spring 2014) Jin-Soo Kim 19
20 ./ftl_tutorial/ftl.c Write Operation ICE3028: Embedded Systems Design (Spring 2014) Jin-Soo Kim 20
21 ./ftl_tutorial/ftl.c Write Operation ICE3028: Embedded Systems Design (Spring 2014) Jin-Soo Kim 21
22 NAND Flash Operation./target_spw/flash.c ICE3028: Embedded Systems Design (Spring 2014) Jin-Soo Kim 22
23 NAND Flash Operation./target_spw/flash.c ICE3028: Embedded Systems Design (Spring 2014) Jin-Soo Kim 23
24 NAND Flash Operation./target_spw/flash_wrapper.c ICE3028: Embedded Systems Design (Spring 2014) Jin-Soo Kim 24
25 ./ftl_tutorial/ftl.c Error Handling ftl_open() ICE3028: Embedded Systems Design (Spring 2014) Jin-Soo Kim 25
26 Any Questions? ICE3028: Embedded Systems Design (Spring 2014) Jin-Soo Kim 26
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