31.2.10.1 Flash Panel ECC Organization

The following table shows the ECC Calculation Vector bit order with respect to flash data bits and parity bits. The first column is the ECC Calculation Vector. The next two columns map the Read/Write Data and ECC Parity bits to the Calculation Vector. V[n] defines the bit which is selected by FFLT*PTR, so n=FFLT*PTR.

Table 31-7. Flash ECC Vector
Vector Bits	Data Bits	ECC Parity Bits
V[n]	D[n]	EP[n]
0	-	0
1	-	1
2	-	2
3	0	-
4	-	3
7:5	3:1	-
8	-	4
15:9	10:4	-
16	-	5
31:17	25:11	-
32	-	6
63:33	56:26	-
64	-	7
71:65	63:57	-
127:72	119:63	-
128	-	8
136:129	127:120	-
255:137	246:128	-
256	-	9
265:257	255:247	-

The following table shows the ECCCTL and CTL field decode. The CTL field is stored in Flash and the fault logic can inject errors into it based on FFLTCTRL.CTLFLT.

Table 31-8. ECC Control Bits
Error Correction Mode	ECCCTL[1:0]	Write Value CTL[2:0]	Read Values CTL[2:0]	Operation
Bypass Mode	2’b11	3’b000	Don’t Care	Quad Write w/ ECC Read w/o ECC Check
Bypass Mode	2’b11	3’b111	Don’t Care	Single Write w/ Parity Read w/o Parity Check
ECC Write Dynamic Read Mode	2’b10	3’b000	3’b000 3’b001 3’b010 3’b100	Quad Write w/ ECC Read w/ ECC
ECC Write Dynamic Read Mode	2’b10	3’b111	3’b111 3’b110 3’b101 3’b011	Single Write Not Available Read w/ Parity
Dynamic Mode	2’b01	3’b000	3’b000 3’b001 3’b010 3’b100	Quad Write w/ ECC Read w/ ECC
Dynamic Mode	2’b01	3’b111	3’b111 3’b110 3’b101 3’b011	Single Write w/ Parity Read w/ Parity
ECC Strict Mode	2’b00	3’b000	Don’t Care	Quad Write w/ ECC Read w/ ECC
ECC Strict Mode	2’b00	N/A	N/A	Single Write is not available All reads use ECC.
Note: If switching modes, Single Writes in Bypass or Dynamic cause SEC and DED errors in ECC mode. It is highly recommend to select and use only one Error Correction Mode.