DZPD6722VCCE INTEL [Intel Corporation], DZPD6722VCCE Datasheet - Page 82

• Manufacturer Part Number: DZPD6722VCCE
• Description: ISA-to-PC-Card (PCMCIA) Controllers
• Manufacturer: INTEL [Intel Corporation]

PD6710/’22 — ISA-to-PC-Card (PCMCIA) Controllers
10.7.5
82
Register Name: External Data
Index: 6Fh only
External Data
Table 16. Functions of Socket B External Data Register (PD6722 only)
RW:0
Bit 7
7
Note: For software compatibility of external data access accross the PC Card (PCMCIA) controller
External Data
External Data (PD6722 only, Socket A, Index 6Fh)
Bits 7:0 — External Data
This register is updated and accessed according to the setting of bits 3 and 4 of the Socket B
Extension Control 2 register (Index 6Fh, Extended Index 0Bh).
product line, the Socket B External Data register should only be used as a read port and not as a
write port. Also for compatibility, only the lower nibble of External Data should be accessed and
the upper nibble should be ignored. For software compatibility with VS1# and VS2# detection
software, when Socket B is used as a read port, socket VS1# and VS2# signals should be connected
to the external read buffer as shown in
Refer to
information on the use of the External Data register, and
page 95
Bit 4: GPSTB
Socket B Extension Control 2
RW:0
Bit 6
on IOW*
6
0
0
1
1
for more information on VS1# and VS2# detection.
“Using GPSTB Pins for External Port Control (PD6722 only)” on page 91
External Data
RW:0
Bit 5
Bit 3: GPSTB
5
on IOR*
0
1
0
1
External Data
Extended Index: 0Ah
RW:0
Bit 4
Bits 7:4 — scratchpad
Bits 3:2 — Socket B VS2# and VS1# levels (PD6722 only)
Bits 1:0 — Socket A VS2# and VS1# levels
External read port: B_GPSTB is a read buffer enable for external data on
SD[15:8].
External write port: B_GPSTB is a write latch enable for SD[15:8] to get
latched to an external register. Reads of Socket B External Data register
produce the value written to the latch.
Reserved
4
Figure 15 on page
External Data
B_VS2# Input
Function of Socket B External Data Register
Bit 3
3 or
R:0
B_VS1# Input
External Data
96.
“VS1# and VS2# Voltage Detection” on
Bit 2
2 or
R:0
Register Compatibility Type: ext.
A_VS2# Input
External Data
Bit 1
1 or
R:0
Register Per: socket
for more
A_VS1# Input
External Data
Datasheet
Bit 0
0 or
R:0