ISA-to-PC-Card (PCMCIA) Controllers — PD6710/’22
7.2
Interface Status
Register Per:
socket
Register Compatibility Type: 365
Bit 6
Bit 5
RDY
Card Power
On
R:0
Ready/Busy*
R
2
Bit 4
WP
Write Protect
R
3
Bit 3
-CD2
Bit 2
-CD1
Bit 1
BVD2
Bit 0
BVD1
Register Name: Interface Status
Index: 01h
Bit 7
-VPP_VALID
V
PP
Valid
R
1
1.
2.
3.
4.
5.
Card Detect
R
4
Battery Voltage Detect
R
5
Bit 7 is the inversion of the value of the -VPP_VALID pin (Table
Bit 5 is the value of the RDY/-IREQ pin (Table
Bit 4 is the value of the WP/-IOIS16 pin (Table
Bits 3:2 are the inversion of the values of the -CD1 and -CD2 pins (Table
Bits 1:0 are the values of the BVD1/-STSCHG and BVD2/-SPKR pins (Table
Bits 1:0 — Battery Voltage Detect
BVD2 Input Level
Low
Low
High
High
BVD1 Input Level
Low
High
Low
High
Bit 1
0
0
1
1
Bit 0
0
1
0
1
PC Card Interpretation
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
Interface mode, bit 0 indicates the state of the BVD1/-STSCHG pin (
Bit 1 status should
be ignored in I/O Card Interface mode.
Bits 3:2 — Card Detect
-CD2 Level
High
High
Low
Low
-CD1 Level
High
Low
High
Low
Bit 3
0
0
1
1
Bit 2
0
1
0
1
Card Detect Status
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 (
Datasheet
47
INTEL [ INTEL CORPORATION ]
