smc256af Numonyx, smc256af Datasheet - Page 49

• Manufacturer Part Number: smc256af
• Description: 32 Mbyte, 64 Mbyte, 128 Mbyte, 256 Mbyte And 512 Mbyte 3.3 V / 5 V Supply Compactflash? Card
• Manufacturer: Numonyx

SMCxxxAF
8.10
8.10.1
8.10.2
8.10.3
8.10.4
Table 43.
Device control register (address 3F6h [376h]; offset Eh)
This write-only register is used to control the CompactFlash memory card interrupt request
and to issue an ATA soft reset to the card. This register can be written even if the device is
BUSY. The bits are defined as follows:
Bit 7 to 3
Don’t care. The host should reset this bit to ‘0’.
Bit 2 (SW Rst)
This bit is set to ‘1’ in order to force the CompactFlash storage card to perform an AT Disk
controller Soft Reset operation. This clears status register and writes diagnostic code in
error register after a write or read sector error. The card remains in reset until this bit is reset
to ‘0.’
Bit 1 (–IEn)
When the Interrupt Enable bit is set to ‘0’, –IREQ interrupts are enabled. When the bit is set
to ‘1’, interrupts from the card are disabled. This bit also controls the Int bit in the card
configuration and status register. It is set to ‘0’ at power-on.
Bit 0
This bit is set to ‘0’.
Table 44.
BUSY
X(0)
D7
D7
Status & alternate status register
Device control register
RDY
X(0)
D6
D6
DWF
X(0)
D5
D5
DSC
X(0)
D4
D4
DRQ
X(0)
D3
D3
SW Rst
CORR
D2
D2
–IEn
D1
CF-ATA registers
D1
0
ERR
D0
D0
0
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