CL-PD6710/’22
ISA–to–PC-Card Host Adapters
6.2 Interface Status
Register Name: Interface Status
Index: 01h
Register Per: socket
Register Compatibility Type: 365
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
-VPP_VALID
RDY
WP
-CD2
-CD1
BVD2
BVD1
Card Power
On
V
Valid
Ready/Busy* Write Protect
Card Detect
Battery Voltage Detect
PP
a
b
c
d
e
R
R:0
R
R
R
R
a
b
c
d
e
Bit 7 is the inversion of the value of the -VPP_VALID pin (see page 15).
Bit 5 is the value of the RDY/-IREQ pin (see page 17).
Bit 4 is the value of the WP/-IOIS16 pin (see page 17).
Bits 3:2 are the inversion of the values of the -CD1 and -CD2 pins (see page 18).
Bits 1:0 are the values of the BVD1/-STSCHG and BVD2/-SPKR pins (see page 18).
Bits 1:0 — Battery Voltage Detect
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
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
-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
These bits indicate the state of the -CD1 and -CD2 pins (see page 18).
Bit 4 — Write Protect
0
Card is not write protected.
Card is write protected.
1
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.
38
May 1997
CHIP CONTROL REGISTERS
PRELIMINARY DATA SHEET v3.1
CIRRUS [ CIRRUS LOGIC ]
