ISA-to-PC-Card (PCMCIA) Controllers — PD6710/’22
7.2
Interface Status
Register Name: Interface Status
Index: 01h
Register Per: socket
Register Compatibility Type: 365
Bit 7
Bit 6
Bit 5
RDY
Bit 4
WP
Bit 3
Bit 2
Bit 1
Bit 0
-VPP_VALID
-CD2
-CD1
BVD2
BVD1
Card Power
On
V
Valid
Ready/Busy* Write Protect
R2 R3
Card Detect
R4
Battery Voltage Detect
R5
PP
R1
R:0
1. Bit 7 is the inversion of the value of the -VPP_VALID pin (Table 1).
2. Bit 5 is the value of the RDY/-IREQ pin (Table 2).
3. Bit 4 is the value of the WP/-IOIS16 pin (Table 2).
4. Bits 3:2 are the inversion of the values of the -CD1 and -CD2 pins (Table 2).
5. Bits 1:0 are the values of the BVD1/-STSCHG and BVD2/-SPKR pins (Table 2).
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
Interface mode, bit 0 indicates the state of the BVD1/-STSCHG pin ( Table 2). 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 ( Table 2).
Datasheet
47
INTEL [ INTEL ]
