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C161 Datasheet(PDF) 173 Page - Infineon Technologies AG |
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C161 Datasheet(HTML) 173 Page - Infineon Technologies AG |
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173 / 400 page  &3, 7KH([WHUQDO%XV ,QWHUIDFH User’s Manual 9-9 1999-08 Disable/Enable Control for Pin BHE (BYTDIS) Bit BYTDIS is provided for controlling the active low Byte High Enable (BHE) pin. The function of the BHE pin is enabled, if the BYTDIS bit contains a ’0’. Otherwise, it is disabled and the pin can be used as standard IO pin. The BHE pin is implicitly used by the External Bus Controller to select one of two byte-organized memory chips, which are connected to the C161PI via a word-wide external data bus. After reset the BHE function is automatically enabled (BYTDIS = ’0’), if a 16-bit data bus is selected during reset, otherwise it is disabled (BYTDIS=’1’). It may be disabled, if byte access to 16-bit memory is not required, and the BHE signal is not used. Segment Address Generation During external accesses the EBC generates a (programmable) number of address lines on Port 4, which extend the 16-bit address output on PORT0 or PORT1 and so increase the accessible address space. The number of segment address lines is selected during reset and coded in bit field SALSEL in register RP0H (see table below). Note: The total accessible address space may be increased by accessing several banks which are distinguished by individual chip select lines. If Port 4 is used to output segment address lines, in most cases the drivers must operate in push/pull mode. Make sure that OPD4 does not select open drain mode in this case. Table 9-3 Decoding of Segment Address Lines SALSEL Segment Address Lines Directly accessible Address Space 1 1 Two: A17...A16 256 KByte (Default without pull-downs) 1 0 Seven: A22...A16 8 MByte (Maximum) 0 1 None 64 KByte (Minimum) 0 0 Four: A19...A16 1 MByte |
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