参数资料
型号: SPD6729QCE
厂商: INTEL CORP
元件分类: 总线控制器
英文描述: PCMCIA BUS CONTROLLER, PQFP208
封装: MQFP-208
文件页数: 43/116页
文件大小: 1442K
代理商: SPD6729QCE
PD6729 — PCI-to-PC Card (PCMCIA) Controller
32
Datasheet
The PD6729 has Extension registers that add to the functionality of the 82365SL-compatible
register set. Within the Extension registers is an Extended Index register and Extended Data
register that provide access to more registers. The registers accessed through Extended Index and
Extended Data are thus double indexed. The example below shows how to access the Extension
Control 1 register, one of the double-indexed registers.
;Write to Extension Control 1 register example
;Constants section
Extended_Index
EQU 2Eh
Index_Reg
EQU 2Fh
Ext_Cntrl_1
EQU 03h
Base_IO_Address
EQU XXX
;The base I/O address for the PD6729
;should be obtained through PCI BIOS.
;Code section
mov
dx, Base_IO_Address
mov
al, Extended_Index
mov
ah, Ext_Cntrl_1
out
dx, ax
mov
al, Index_Reg
mov
ah, user_data
;Desired data to be
Figure 8. Indexed 8-Bit Register Structure
Figure 9. Indexed 8-Bit Register Example
00h
01h
02h
FEh
FFh
Base Address 0 + 1
Base Address 0
Internal Registers
Register
indexes
I/O Addresses
Data
Index
Low Mid. Byte
Low Byte
X
The following code segment demonstrates
use of an indexed 8-bit register:
mov dx, XXX
mov al, 02h
mov ah, 3Ch
out dx, ax
02h
Base Address 0 + 1
Base Address 0
Internal Registers
Register
indexes
I/O Addresses
3Ch
02h
3Ch
X
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