Toshiba H1 Series Data Book page 249

3.11.4 Description of Registers
NDFMCR0
bit Symbol
(08C0H)
Read/Write
After reset
Read-modify-
write
instructions
cannot be
used.
Function
(08C1H)
bit Symbol
Read/Write
Read-modify-
write
After reset
instructions
cannot be
used.
Function
(a) <ECCRST >
The <ECCRST> bit is used for both Hamming and Reed-Solomon codes.
When NDFMCR1<ECCS>="0", setting this bit to "1" clears the Hamming ECC in the
ECC generator. When NDFMCR1<ECCS>="1", setting this bit to "1" clears the
Reed-Solomon ECC. Note that this bit is ineffective when NDFMCR0<ECCE>="0". Before
writing to this bit, ensure that NDFMCR0<ECCE>="1".
(b) <BUSY>
The <BUSY> bit is used for both Hamming and Reed-Solomon codes.
This bit is used to check the state of the NAND Flash memory (NDR/B pin). It is set to "1"
when the NAND Flash is "busy" and to "0" when it is "ready".
Since the NDFC incorporates a noise filter of several states, a change in the NDR/B pin
state is reflected on the <BUSY> flag after some delay. It is therefore necessary to inert a
delay time by software (e.g. ten NOP instructions) before checking this flag.
Read
command
NDWE pin
NDCLE pin
NDALE pin
NDR/B pin
<BUSY> flag
NAND Flash Control 0 Register
7 6
WE ALE CLE
R/W R/W R/W
0 0
WE ALE CLE
enable
control control
0: Disable 0: "L" out 0: "L" out
1: Enable 1: "H" out 1: "H" out
15 14
SPLW1 SPLW0 SPHW1
0 0
Strobe pulse width Strobe pulse width
(Low width of NDRE , (High width of NDRE ,
NDWE ) NDWE )
Inserted width Inserted width
) × (set value)
= (f = (f
SYS
Figure 3.11.5 NAND Flash Mode Control 0 Register
Address input
92CZ26A-246
5 4 3
CE0 CE1
R/W R/W
0 0 0
CE 0 CE 1
control control
0: "H" out 0: "H" out
1: "L" out 1: "L" out
13 12 11
SPHW0 RSECCL
R/W
0 0 0
Reed-
Solomon
ECC
latch
) × (set value)
SYS
0: Disable
1: Enable
Delay
Sensing <BUSY> flag
time
TMP92CZ26A
2 1
ECCE BUSY ECCRST
R/W R
0 0
NAND ECC
ECC circuit
Flash reset
control
state control
0: Disable
0: −
1: Busy
1: Enable
0: Ready 1: Reset
*Always
read as
"0".
10 9
RSEDN RSESTA RSECGW
W R/W
0 0
Reed- Reed-
Reed-
Solomon Solomon Solomon
operation error ECC
0: Encode calculation generator
(Write) start write
1: Decode 0: −
control
(Read)
1: Start 0: Disable
1: Enable
*Always
read as
"0".
0
W
0
8
0