OT:PCMCIA ATA command block register programming Q

NTDEV
1

Hi all,

I have a pcmcia ATA flash card of 10MB. I need to address a particular
sector and do READ/WRITE operation to any 512 bytes in the particular
sector. so i did the following. please note i am using pcmcia ATA I/O
mapped mode.

command block for writing sector

Register operation Reg. address Reg. data

  1. Data Write 0x0 data to be written,say
    0x5a
  2. Feature Write 0x1 0x1 – Enable 8-bit
    transfer
  3. Command write 0x7 0xEF --to set the above
    feature
  4. sector count write 0x2 0x0
  5. LBA (7:0) write 0x3 0x1 – 1 sector
  6. LBA (15:8) write 0x4 0x0
  7. LBA(23:16) write 0x5 0x0
  8. Drv/Hd LBA(27:24)Write 0x6 0xE0/F0 – LBA MODE,

Now i read the status register for checking present status

  1. status Read 0x7 0x50

Now i write the command register

  1. command write 0x7 0x32/0x33

Now I again check the status

  1. status Read 0x7 0x58 – it shows 0x58
  2. error Read 0x1 0x0

command block for reading sector:-

  1. command write 0x7 0x22/23

Now I again check the status

  1. status Read 0x7 0x58 – it shows 0x58
  2. error Read 0x1 0x0

On reading the data register 0x0 , i have the value of 0x0 instead of
0x5a

Can anybody please let me know where am i going wrong…?
Is there any initialisation to be done before making read/write…?
Is there any reset to be performed before read/write…?

Pls throw some light for the above queries…

Thanx ,in anticipation of some help,

Shiva P

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