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參數(shù)資料
| 型號： | VT83C469 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | PCMCIA Socket Controller |
| 中文描述： | PCMCIA插槽控制器 |
| 文件頁數(shù)： | 5/36頁 |
| 文件大?。?/td> | 156K |
| 代理商： | VT83C469 |
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VIA Technologies, Inc.
Memory and I/O Mapping
Preliminary
VT83C469
5
The VT83C469 provides logic to map portions of the 64MB common memory and/or 64MB attribute memory
spaces on the PC Card into the smaller 16MB (ISA) system address space. The VT83C469 mapping function
provides extension of the system address space up to the full 64MB PC Card capability.
Start and stop addresses are specified with ISA address bits 23 through 12. This sets the minimum size of a memory
window into 4KB. Memory windows are specified in the ISA address from 64K to 16MB. Note that no memory
window can be mapped in the first 64K of the ISA address space. Only I/O address windows are allowed to be
mapped between 0 and 64KB in the ISA address space.
PC Card memory is accessed only when all of the following conditions are satisfied:
1. The system memory address mapping window is enabled.
2. The system memory address is greater than or equal to the system memory address mapping start
register A23:A12.
3. The system memory address is less than or equal to the system memory address mapping stop register
A23:A12..
An I/O PC Card is accessed when the following conditions are satisfied:
1. The I/O address window is enabled.
2. The system address is greater than or equal to the I/O address start register A15:A0.
3. The system address is less than or equal to the I/O address stop register A15:A0
4. The access is not a DMA transfer. AEN = 0 to access the I/O PC Card.
Mixed Voltage Operation
The VT83C469 has three power planes: the ISA bus interface, socket A interface and socket B interface. The ISA
bus power planes connect to the core power plane and supports 5v operation. Socket A and socket B power planes
each can be independently connected to 3v or 5v. The two voltage detect pins are: A_5VDECT and B_5VDECT.
P
INS
VT83C469 P
IN
D
EFINITION
A_5VDet
B_5VDet
A_3Ven
B_3Ven
VG-468 P
IN
D
EFINITION
Vcc
Vcc
GND
GND
191
141
27
101
In a mixed voltage implementation, the socket will not be powered unless there is a card in the socket. After the card
is inserted, the system reads the voltage sensor pins and allows the CIS to determine the voltage to be applied to the
card. Then it writes to the POWER control register, bit 4, which enables the outputs to the voltage switch.
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