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參數資料
型號: W90221F
廠商: WINBOND ELECTRONICS CORP
英文描述: PA-RISC Embedded Micro-Controller(惠普PA-RISC結構的32位嵌入式微控制器)
中文描述: PA - RISC的嵌入式微控制器(惠普的PA - RISC結構的32位嵌入式微控制器)
文件頁數: 105/174頁
文件大小: 2102K
代理商: W90221F
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The above information is the exclusive intellectual property of Winbond Electronics and shall not be disclosed, distributed or reproduced without permission from Winbond.
105
Versi on 0. 4, March/2000
Bits 21-31 Number of PCICLK count for Master Latenercy Adjustment
Latenercy Time = REQ3_reg[0:11] / PCICLK
6.5 AIO BUS CONTROLLER
W90221 Provides a ISA-like bus for low speed devices such as ROM, Flash or other 8-bit/16-bit IOs. The
bus shares the 32-bit data/addr bus, 4-bit comm/byte bus and the INTD_ signal of PCI bus. AIO supports
only 8-bit memory (like ROM/Flash) and 8- or 16-bit IO of devices attached on the bus. Also, the bus
provides up to 16Mbyte (24 bits address lines) addressing space for memory and 64K (16 bits address lines)
for IOs. Two base registers, 8-bit base for memory and 16 bit for IO, point to the start address of AIO-
memory and AIO-IO space individually. System space 0xf0000360 ~ 0xf0000367 is allocated for three 16-
bit configuration registers of AIO bus controller.
Table 6.5-1 : AIO Register Map
(IO base (BA) : 0xf0000000)
Port Addr.
Symbol
Access
Description
BA + 0x360
CFG[0:15]
R/W
Configuration Register
BA + 0x362
AIOBASE[0:15]
R/W
AIO-IO Space Base Register
BA + 0x364
XMBASE[7:15]
R/W
AIO-ROM Space Base Register
BA + 0x366
-
-
Reserved
Configuration Register (CFG)
Port address : 0xf0000360
Read/Write
Power-on Default : 0x0
0
1
2
3
4
5
6
IO_EN
IOext
ROMWext
7
8
9
10
11
12
13
14
15
ROMRext
CMDset
CMDhold
CMDrec
Bits 0 AIO IO-space enable
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