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| 型號(hào)： | PD6710 |
| 廠商： | Intel Corp. |
| 英文描述： | ISA-to-PC-Card (PCMCIA) Controllers |
| 中文描述： | ISA -到- PC卡（PCMCIA）的控制器 |
| 文件頁(yè)數(shù)： | 82/138頁(yè) |
| 文件大?。?/td> | 723K |
| 代理商： | PD6710 |
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PD6710/
’
22
—
ISA-to-PC-Card (PCMCIA) Controllers
82
Datasheet
10.7.5
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).
Note:
For software compatibility of external data access accross the PC Card (PCMCIA) controller
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
Figure 15 on page 96
.
Refer to
“
Using GPSTB Pins for External Port Control (PD6722 only)
”
on page 91
for more
information on the use of the
External Data
register, and
“
VS1# and VS2# Voltage Detection
”
on
page 95
for more information on VS1# and VS2# detection.
Register Name:
External Data
Index:
6Fh only
Extended Index:
0Ah
Register Per:
socket
Register Compatibility Type:
ext.
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
External Data
7
External Data
6
External Data
5
External Data
4
External Data
3 or
B_VS2# Input
External Data
2 or
B_VS1# Input
External Data
1 or
A_VS2# Input
External Data
0 or
A_VS1# Input
RW:0
RW:0
RW:0
RW:0
R:0
R:0
R:0
R:0
Table 16. Functions of Socket B External Data Register (PD6722 only)
Socket B Extension Control 2
Function of Socket B External Data Register
Bit 4: GPSTB
on IOW*
Bit 3: GPSTB
on IOR*
0
0
Bits 7:4
—
scratchpad
Bits 3:2
—
Socket B VS2# and VS1# levels (PD6722 only)
Bits 1:0
—
Socket A VS2# and VS1# levels
0
1
External read port: B_GPSTB is a read buffer enable for external data on
SD[15:8].
1
0
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.
1
1
Reserved
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