參數(shù)資料
型號(hào)： 22450C
英文描述： MicroManager Chip
中文描述： 手動(dòng)？lanSC520微控制器的客戶開發(fā)平臺(tái)（CDP）的用戶手冊(cè)
文件頁(yè)數(shù)： 46/78頁(yè)
文件大?。?/td> 1849K
代理商： 22450C
élanSC520 Microcontroller Customer Development Platform User’s Manual
2-14
Flash Memory
The on-board Flash memory uses the AMD Am29LV017B and consists of
following configuration:
Two 8-Mbyte banks in a 32-bit data width consisting of eight 2-Mbit x 8 devices
The Flash memory is used for the BIOS and/or Execute-In-Place memory that
interfaces to the élanSC520 microcontroller only through the SDRAM data bus
MD31–MD0 or the residential Flash disk (RFD).
An additional two banks of Flash/ROM is optionally available on a 32-Mbyte
daughter module that can be configured to interface to either the 32-bit SDRAM
MD bus (with 8/16/32-bit data width (x32 is only available when data bus is
selected on SDRAM MD31–MD0 and selected by BOOTCS, ROMCS1, or
ROMCS2)) or with the 16-bit GP bus (with 8- or 16-bit selectable).
BOOTCS can be assigned to each Flash bank. ROMCS1 and ROMCS2 can be
assigned to the 16-Mbytes on-board Flash bank and/or the 32-Mbyte Flash
daughter card. Flash ROMs are configured as 32-bit wide on both the on-board and
daughter modules. If the Flash memory is set as 8-bit or 16-bit data width, the
higher bytes are not accessible on the élanSC520 microcontroller CDP. The
élanSC520 microcontroller CDP demonstrates the ability of only sizing the data
width for ROM access. The user can configure it in any bus size to access the entire
ROM space by rearranging the address bus for BOOTCS, ROMCS1, and ROMCS2.
The Flash ROM x8 DIP is connected on the GP bus and can be selected only by
BOOTCS. The Flash ROM x32 onboard memory is connected only on SDRAM
MD31–MD0, and it can be selected by BOOTCS, ROMCS1, and ROMCS2.
The Flash ROM daughter module contains configuration jumpers. Users can
configure the module as x8, x16, x32 data width on the GP bus (GPD15–GPD0)
or the SDRAM Bus (MD31–MD0).
Figure 2-7 on page 2-15 shows the Flash memory configuration supported by the
élanSC520 microcontroller CDP.
Figure 2-8 on page 2-16 shows a Flash memory configuration block diagram.
Table 2-3 on page 2-16 shows the signals, inputs, and outputs for each type of
memory.
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