參數(shù)資料
型號: PSB7110
廠商: SIEMENS AG
英文描述: Enhanced ISDN Data Access Controller ISAR
中文描述: 增強綜合業(yè)務數(shù)字網(wǎng)的數(shù)據(jù)接入控制器專家組
文件頁數(shù): 20/164頁
文件大?。?/td> 1173K
代理商: PSB7110
_________________________________________________PSB 7110
Siemens Aktiengesellschaft
Page 20
1.7
Memory Configuration
The ISAR requires external memory with a configuration of 32K x 16 and with 10 ns access time to
store operational data and the DSP program which is downloaded after a hardware reset.
The figure below shows the recommended configuration with two 32K x 8 SRAMs. Since there is a
common layout, no additional changes are required when converting to the ISAR ROM version V1.1.
(7110_17)
Figure 9 ISAR Memory Interface
For both ISAR Versions 1.0 and 1.1 the jumper JP1 has to be set to connect CPS# to the CS#-inputs
of the SRAMs.
To enable compatibility with future versions of the ISAR, the layout should be designed to enable the
different ways to connect the CS#-lines of the SRAMs.
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