
PRELIMINARY DATA SHEET v3.1
CL-PD6710/’22
ISA–to–PC-Card Host Adapters
May 1997
38
CHIP CONTROL REGISTERS
6.2
Interface Status
Bits 1:0 — Battery Voltage Detect
These bits are used by PC Card support software and firmware to indicate the amount of capacity
left in the battery in battery-backed cards in Memory Card Interface mode only. In I/O Card Inter-
face mode, bit 0 indicates the state of the BVD1/-STSCHG pin (see
page 19
). Bit 1 status should
be ignored in I/O Card Interface mode.
Bits 3:2 — Card Detect
These bits indicate the state of the -CD1 and -CD2 pins (see
page 18
).
Bit 4 — Write Protect
This bit indicates the state of the WP/-IOIS16 pin (see
page 17
) on the card and has meaning only
in Memory Card Interface mode.
a
Bit 7 is the inversion of the value of the -VPP_VALID pin (see
page 15
).
b
Bit 5 is the value of the RDY/-IREQ pin (see
page 17
).
c
Bit 4 is the value of the WP/-IOIS16 pin (see
page 17
).
d
Bits 3:2 are the inversion of the values of the -CD1 and -CD2 pins (see
page 18
).
e
Bits 1:0 are the values of the BVD1/-STSCHG and BVD2/-SPKR pins (see
page 18
).
Register Name:
Interface Status
Index:
01h
Bit
7
-VPP_VALID
Register Per: socket
Register Compatibility Type: 365
Bit
1
BVD2
Bit
6
Bit
5
RDY
Bit
4
WP
Bit
3
-CD2
Bit
2
-CD1
Bit
0
BVD1
V
PP
Valid
Card Power
On
Ready/Busy*
Write Protect
Card Detect
Battery Voltage Detect
R
a
R:0
R
b
R
c
R
d
R
e
BVD2 Input Level
BVD1 Input Level
Bit 1
Bit 0
PC Card Interpretation
Low
Low
High
High
Low
High
Low
High
0
0
1
1
0
1
0
1
Card data lost
Battery low warning
Card data lost
Battery/data okay
-CD2 Level
-CD1 Level
Bit 3
Bit 2
Card Detect Status
High
High
Low
Low
High
Low
High
Low
0
0
1
1
0
1
0
1
Either no card or card is not fully inserted
Card is not fully inserted
Card is not fully inserted
Card is fully inserted
0
1
Card is not write protected.
Card is write protected.