topic Re: VF51xx/NFC virtual page layout and Physical page layout in Vybrid Processors

VF51xx/NFC virtual page layout and Physical page layout

soichiyamamoto — Tue, 08 Oct 2013 02:00:11 GMT

Hi,

I have question about NFC Buffer Memory Space of the NFC.

I summarized virtual page layout and Physical page layout in a file.

I attached it.

Is my understanding right?

Best regards,

soichi yamamoto

Re: VF51xx/NFC virtual page layout and Physical page layout

juangutierrez — Wed, 09 Oct 2013 00:46:19 GMT

Looks good but I think only the physical layout for second case should be like this:

From	To	Size	Area	Description
0	511	512	Main0(page0)	UserData
512	512	1	Reserved
513	527	15	ECC for main/spare
528	1039	512	Main1(page1)	UserData
1040	1040	1	Reserved
1041	1055	15	ECC for main/spare
1056	1567	512	Main2(page2)	UserData
1568	1568	1	Reserved
1569	1583	15	ECC for main/spare
1584	2095	512	Main3(page3)	UserData
2096	2096	1	Reserved
2097	2111	15	ECC for main/spare

Re: Re: VF51xx/NFC virtual page layout and Physical page layout

soichiyamamoto — Thu, 10 Oct 2013 13:42:22 GMT

Dear Juan Antonio Gutierrez Rosas,

Thank you for reply,

In this（Sector size = 2,048(main)+128(spare)） case, I arrive, and please tell me.

I attached a file.

Does the Sector size = 2,048(main)+128(spare) support?

And is the correction range of ECC 2,048(main)+128(spare)?

Best regards,

soichi yamamoto

Re: VF51xx/NFC virtual page layout and Physical page layout

juangutierrez — Thu, 10 Oct 2013 23:49:00 GMT

Actually, because the flow program operation in the NFC the ECC is programmed just after the Main area. So the below organization should be the right way to see it. Note that the ECC is contiguous to the user data and the rest of spare area is just unused or reserved.

2048 byte（main） + 64 byte （spare）

ECC bits =8, NFC_CFG[PAGE CNT]=4, Sector size = 512+16

From	To	Size	Area	Description
0	511	512	Main0(page0)	UserData
512	526	15	ECC	Spare
527	527	1	Unused	Spare
528	1039	512	Main0(page0)	UserData
1040	1054	15	ECC	Spare
1055	1055	1	Unused	Spare
1056	1567	512	Main0(page0)	UserData
1568	1582	15	ECC	Spare
1583	1583	1	Unused	Spare
1584	2095	512	Main0(page0)	UserData
2096	2110	15	ECC	Spare
2111	2111	1	Unused	Spare

2048 byte（main） + 128 byte （spare）

ECC bits =32, NFC_CFG[PAGE CNT]=1, Sector size = 2048+128

Same behavior applies for the 2048+64

From	To	Size	Area	Description
0	2047	2048	Main0(page0)	UserData
2048	2107	60	ECC	Spare
2108	2175	68	Unused	Spare

Regarding the geometry support.

The RM mentions that one of the NFC features is that

Supports all NAND flash products regardless of density/organization

On the other hand this organization is not listed in the recommended setting (Table 31-21.)

So, my guess is that is supported but not recommended. For example the Spare area might be used besides the ECC for

wear-leveling, bad block mark and other software overhead functions. So in the case of 512+16 bytes ECC bits =8 (15 bytes) there is only one byte left so it might be not enough space for this others overhead functions and hence not recommended.

Not sure why the 2048+64 is not listed in Table 31-21 but possible is not recommended too.

Re: Re: VF51xx/NFC virtual page layout and Physical page layout

soichiyamamoto — Fri, 11 Oct 2013 01:59:24 GMT

Dear Juan Antonio Gutierrez Rosas,

Thank you for reply.

In the case of follows, I arrive and recognize it and confirm it.

　・2048 byte（main） + 64 byte （spare）

　・ECC bits =32, NFC_CFG[PAGE CNT]=1, Sector size = 2048+64

Q1.Which constitution of case1 and case2 is right?

case1:

From	To	Size	Area	Description
0	2047	2048	Main0(page0)	UserData
2048	2107	60	ECC	Spare
2108	2111	4	Unused	Spare

case 2:

From	To	Size	Area	Description
0	2047	2048	Main0(page0)	UserData
2048	2151	4	Unused	Spare
2152	2111	60	ECC	Spare

Q2.Is the range of the ECC correction 2,048+64?

Q3.In the case of follows, I arrive and recognize it and confirm it.

　・2048 byte（main） + 128 byte （spare）

　・ECC bits =32, NFC_CFG[PAGE CNT]=1, Sector size = 2048+128

Is the range of the ECC correction 2,048+128?

Best Regards,

soichi yamamoto

Re: VF51xx/NFC virtual page layout and Physical page layout

karina_valencia — Tue, 22 Oct 2013 21:32:05 GMT

juangutierrez please continue with the follow up on this case.

Re: VF51xx/NFC virtual page layout and Physical page layout

juangutierrez — Tue, 22 Oct 2013 21:47:47 GMT

For Q1 case1 is correct.

Sorry Q2 and Q3 are not clear to me. what do you mean by "Is the range of the ECC correction" ?