Phytec miniMODUL-537, Hardware Manual

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miniMODUL-537
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PHYTEC Meßtechnik GmbH 2001 L-006e_2
5.1 Jumper for Address Selection
The following statements for the memory-configurations refer only to
the module-internal address-decoding. They don’t represent a
restriction for the application of the module. You are always able to
choose any memory-configuration for your application, by the
utilization of external address decoders.
JP7a and JP7b RAM-address selection for U12 and U13
For jumper 7 A15 or /A15 is selected as /CE-signal for RAM U12 and
U13. Those jumpers are positioned before driver U10, which can be
switched off, so that their position is ineffective for the external de-
selection by XRAM1 and XRAM2.
The connection with A15 selects the range 0000H..7FFFH.
The connection with /A15 selects the range 8000H..FFFFH.
For the configuration of the jumpers use the jumper-diagram.
JP11a and JP11b program/data memory selection for U12 and U13
With jumper 11, /RD or /VN is used to connect the data with the
databus. In the position to /RD only data-memory access is possible.
For the position to /VN the corresponding RAM is selected as
program-memory. It is obvious, that the address region of the region
selected as program-memory can not be selected for the EPROM.