PD6710/
’
22
—
ISA-to-PC-Card (PCMCIA) Controllers
76
Datasheet
Bit 1
—
Speaker Is LED Input
This bit changes the function of the BVD2/-SPKR/-LED pin (see
Table 2 on page 20
) from digital
speaker input to disk status LED input. When in I/O Card Interface mode or ATA mode, setting this
bit to
‘
1
’
reconfigures the BVD2/-SPKR/-LED input pin to serve as a -LED input from the socket.
Note:
This bit should be set to
‘
0
’
if in Memory Card Interface mode.
Bit 3
—
A21
In ATA mode, the value in this bit is applied to the ATA A21 pin and is vendor-specific. Certain
ATA drive vendor-specific performance enhancements beyond the PC Card Standard may be
controlled through use of this bit. This bit has no hardware control function when not in ATA mode.
Bit 4
—
A22
In ATA mode, the value in this bit is applied to the ATA A22 pin and is vendor-specific. Certain
ATA drive vendor-specific performance enhancements beyond the PC Card Standard may be
controlled through use of this bit. This bit has no hardware control function when not in ATA mode.
Bit 5
—
A23/VU
In ATA mode, the value in this bit is applied to the ATA A23 pin and is vendor-specific. Certain
ATA drive vendor-specific performance enhancements beyond the PC Card Standard may be
controlled through use of this bit. This bit has no hardware control function when not in ATA mode.
Bit 6
—
A24/M/S*
In ATA mode, the value in this bit is applied to the ATA A24 pin and is vendor-specific. Certain
ATA drive vendor-specific performance enhancements beyond the PC Card Standard may be
controlled through use of this bit. This bit has no hardware control function when not in ATA mode.
Bit 7
—
A25/CSEL
In ATA mode, the value in this bit is applied to the ATA A25 pin and is vendor-specific. Certain
ATA drive vendor-specific performance enhancements beyond the PC Card Standard may be
controlled through use of this bit. This bit has no hardware control function when not in ATA mode.
0
Normal operation.
1
The PC Card -SPKR pin will be used to drive IRQ12 if Drive LED Enable (see
“
Bit 4
—
Drive
LED Enable
”
on page 73
) is set.