CL-PD6710/’22
ISA–to–PC-Card Host Adapters
13. VS1# AND VS2# VOLTAGE DETECTION
The CL-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 deter-
mine the operating voltage range of a card before applying power to it.The CL-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:
Register Name: External Data
Index: 6Fh
Register Per: socket
Register Compatibility Type: ext.
Extended Index: 0Ah
Bit 4 Bit 3
Bit 7
Bit 6
Bit 5
Bit 2
Bit 1
Bit 0
External Data External Data External Data External Data
B_VS2 Input B_VS1 Input A_VS2 Input A_VS1 Input
7
6
5
4
RW:0
RW:0
RW:0
RW:0
R:0
R:0
R:0
R:0
For voltage detection on the CL-PD6710, refer to the 5V_DET pin.
May 1997
81
PRELIMINARY DATA SHEET v3.1
VS1# AND VS2# VOLTAGE DETECTION
CIRRUS [ CIRRUS LOGIC ]
