DZPD6722VCCE INTEL [Intel Corporation], DZPD6722VCCE Datasheet - Page 95
DZPD6722VCCE
Manufacturer Part Number
DZPD6722VCCE
Description
ISA-to-PC-Card (PCMCIA) Controllers
Manufacturer
INTEL [Intel Corporation]
Datasheet
1.DZPD6722VCCE.pdf
(138 pages)
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Datasheet
Register Name: External Data
Index: 6Fh
External Data
RW:0
Bit 7
7
External Data
VS1# and VS2# Voltage Detection
The PD6722 provides support for VS1# and VS2# voltage sense for environments where special
low-voltage keyed PC Card sockets are to be used. With a low-voltage keyed socket, it is necessary
to determine the operating voltage range of a card before applying power to it. The PD6722
supports reading of the levels on a socket’s VS1# and VS2# pins through a uniform extended
register programming model using Socket B extended register 0Ah. The programming model is as
follows:
For voltage detection on the PD6710, refer to the 5V_DET pin.
On the PD6722, the B_GPSTB pin is programmed as a general-purpose read strobe. The VS1# and
VS2# pins from the A and B sockets are connected to the external half of a ’244 buffer as follows
(which allows Socket A VS1 and VS2 to appear as bits 0 and 1, and Socket B VS1 and VS2 to
appear as bits 2 and 3):
RW:0
Bit 6
6
External Data
RW:0
Bit 5
5
External Data
Extended Index: 0Ah
RW:0
Bit 4
4
ISA-to-PC-Card (PCMCIA) Controllers — PD6710/’22
B_VS2 Input
Bit 3
R:0
B_VS1 Input
Bit 2
R:0
Register Compatibility Type: ext.
A_VS2 Input
Bit 1
R:0
Register Per: socket
A_VS1 Input
Bit 0
R:0
95
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