PD6710 Datasheet, PDF (78/138 Pages) Intel Corporation – ISA-to-PC-Card (PCMCIA) Controllers

PD6710/’22 — ISA-to-PC-Card (PCMCIA) Controllers
10.7.1
Data Mask 0–1
Register Name: Data Mask 0–1
Index: 2Fh
Bit 7
Bit 6
Bit 5
Extended Index: 01h, 02h
Bit 4
Bit 3
Bit 2
Register Per: socket
Register Compatibility Type: ext.
Bit 1
Bit 0
Data Mask Select 0–1
RW:00000000
Data Mask 0 is the mask register for I/O Map 0. For each bit set in the Data Mask Select 0 field,
the corresponding data bit will not be driven when the host addresses PC Card I/O addresses in the
I/O Map 0 range. If this register is set to 00h, then all data bits will be driven from the PC Card to
the ISA bus (this is the reset condition). If any bits are set to ‘1’, accesses to the I/O Map 0 range of
I/O on the PC Card will be forced to 8-bit operation on the ISA side. If, for example, I/O Map 0
registers are set for the range 3F7h to 3F7h, I/O Map 1 registers are set for the range 3F0h to 3F6h,
Data Mask Select 0 is set to 7Fh, and a floppy drive is the PC Card device, then the conflict
between the floppy address 3F7h and the hard disk register at 3F7h would not cause a conflict on
the ISA bus — the floppy change bit would be correctly presented to the host.
The Data Mask 1 register operates the same as the Data Mask 0 register but acts on I/O addresses
in the range indicated by the I/O Map 1 registers.
10.7.2
Extension Control 1 (PD6722 only, formerly DMA Control)
Register Name: Extension Control 1
Index: 2Fh
Bit 7
Bit 6
Bit 5
DMA Enable
(PD6722)
Pull-up
Control
RW:00
RW:0
Extended Index: 03h
Bit 4
Bit 3
Reserved
RW:00
Bit 0 — V_CC Power Lock
Bit 2
Register Per: socket
Register Compatibility Type: ext.
Bit 1
Bit 0
LED Activity Auto Power V_CC Power
Enable
Clear Disable
Lock
RW:0
RW:0
RW:0
0
The V_CC Power bit (bit 4 of Power Control register) is not locked.
1
The V_CC Power bit (bit 4 of Power Control register) cannot be changed by software.
This bit can be used to prevent card drivers from overriding the Socket Services’ task of controlling
power to the card, thus preventing situations where cards are powered incorrectly.
Bit 1 — Auto Power Clear Disable
0
The V_CC Power bit (bit 4 of Power Control register) is reset to ‘0’ when the card is removed.
1
The V_CC Power bit (bit 4 of Power Control register) is not affected by card removal.
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Datasheet