參數(shù)資料
型號: AM79C930VCW
廠商: ADVANCED MICRO DEVICES INC
元件分類: 微控制器/微處理器
英文描述: PCnet-Mobile Single-Chip Wireless LAN Media Access Controller
中文描述: 2 CHANNEL(S), LOCAL AREA NETWORK CONTROLLER, PQFP144
封裝: TQFP-144
文件頁數(shù): 62/161頁
文件大?。?/td> 691K
代理商: AM79C930VCW
AMD
P R E L I M I N A R Y
62
Am79C930
Am79C930 Device PCMCIA Mode Attribute Memory Restricted Space
PCMCIA Address
in Attribute Memory SIR1[5:3] Size of Restricted Space
7FE0h – 7FFFh
111
Physical Memory and Description of Reserved Use
Flash Memory 1 FFF0h – 1 FFFFh
These 16 bytes of Flash memory space are reserved
because they are the location of the embedded 80188
core’s instruction pointer following a Am79C930 device
reset operation. These 16 bytes
must
contain the first 80188
instructions.
32 bytes of Attribute
memory, 16 bytes of actual
Flash memory space
PCMCIA I/O Resources
— The Am79C930 device oc-
cupies either 16 or 40 bytes of I/O space, depending
upon the setting of the EIOW bit (bit 2 of the BSS register
(SIR1)). The I/O space of the Am79C930 contains the
General Configuration Register, the Bank Switching Se-
lect Register, and the set of 32 TIR registers. Addition-
ally, all Am79C930 resources are accessible through
I/O accesses, i.e., all memorystructures are accessible
through the Local Memory Address and I/O Data
Ports (SIR2,3,4,5,6,7).
The Local Memory Address port plus SIR1[5:3] function
together as a pointer to the memory resources of the
Am79C930 device. SIR1[5] determines the device
selected (SRAM or Flash), and SIR1[4:3] and
LMA[14:0] supply the address to the selected device
whenever the I/O Data Port is read or written. Whenever
any of the I/O Data Ports is accessed, then the Local
Memory Address Port value is automatically incre-
mented by a value of “1.”
Note that the Am79C930 device always decodes the
lowest 6 bits of address when an I/O access is per-
formed with the Am79C930 device’s
CE1
signal active.
This means that there is aliasing of addresses in I/O
space. This decode function is unaffected by the setting
of the SIR1[2:0] register bits.
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