Контроллер Nand Flash (NDFC): список регистров

  Unused

  NDFC_RDATA_STA_0

0: The number of bit 1 during current read operation is more than threshold
value.
1: The number of bit 1 during current read operation is less than or equal to
threshold value.
This field only is valid when NDFC_RDATA_STA_EN is 1.
The threshold value is configured in NDFC_RDATA_STA_TH.

  NDFC_RDATA_STA_1

0: The number of bit 0 during current read operation is more than threshold value.
1: The number of bit 0 during current read operation is less than or equal to the
threshold value.
This field only is valid when NDFC_RDATA_STA_EN is 1.
The threshold value is configured in NDFC_RDATA_STA_TH.

  NDFC_RB_STATE3

NAND Flash R/B 3 Line State
0: NAND Flash in BUSY State
1: NAND Flash in READY State

  NDFC_RB_STATE2

NAND Flash R/B 2 Line State
0: NAND Flash in BUSY State
1: NAND Flash in READY State

  NDFC_RB_STATE1

NAND Flash R/B 1 Line State
0: NAND Flash in BUSY State
1: NAND Flash in READY State

  NDFC_RB_STATE0

NAND Flash R/B 0 Line State
0: NAND Flash in BUSY State
1: NAND Flash in READY State

  Unused

  NDFC_STA

0: NDFC FSM in IDLE state
1: NDFC FSM in BUSY state
When NDFC_STA is 0, NDFC can accept new command and process command.

  NDFC_CMD_FIFO_STATUS

0: Command FIFO not full and can receive new command
1: Full and waiting NDFC to process commands in FIFO
Since there is only one 32-bit FIFO for command. When NDFC latches one
command, command FIFO is free and can accept another new command.

  NDFC_DMA_INT_FLAG

When it is 1, it means that a pending DMA is completed. It will be cleared after
writing 1 to this bit or it will be automatically cleared before FSM processing an
new command.

  NDFC_CMD_INT_FLAG

When it is 1, it means that NDFC has finished one Normal Command Mode or
one Batch Command Work Mode. It will be cleared after writing 1 to this bit or
it will be automatically cleared before FSM processing an new command.

  NDFC_RB_B2R

When it is 1, it means that NDFC_R/B# signal is transferred from BUSY state to
READY state. It will be cleared after writing 1 to this bit.

Команда U-Boot для чтения регистра

Bit fields structure

typedef union  ndfc_st
{
  struct
  {
   unsigned ndfc_rb_b2r : 1;
   unsigned ndfc_cmd_int_flag : 1;
   unsigned ndfc_dma_int_flag : 1;
   unsigned ndfc_cmd_fifo_status : 1;
   unsigned ndfc_sta : 1;
   unsigned unused0 : 3;
   unsigned ndfc_rb_state0 : 1;
   unsigned ndfc_rb_state1 : 1;
   unsigned ndfc_rb_state2 : 1;
   unsigned ndfc_rb_state3 : 1;
   unsigned ndfc_rdata_sta_1 : 1;
   unsigned ndfc_rdata_sta_0 : 1;
   unsigned unused1 : 18;
  } b;
   unsigned long w;
} NDFC_ST