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MA28155 Datasheet(PDF) 4 Page - Dynex Semiconductor |
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MA28155 Datasheet(HTML) 4 Page - Dynex Semiconductor |
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4 / 20 page  MA28155 4/20 OPERATING MODE 0 (Basic Input/Output) This functional configuration provides simple input and output operation for each of the three ports. No handshaking is required; data is simply written to or read from a specified port. s Two 8-bit ports and 4-bit ports s Any port can be input or output s Outputs are latched s Inputs are not latched. s 16 different Input/Output configurations are possible in this Mode. Group A and Group B Controls The functional configuration of each port is programmed by the system software. In essence, the CPU outputs a control word to the MA28155. The control word contains information such as mode, bit set, bit reset, etc., this initializes the functional configuration of the MA28155. Each of the Control blocks (Group A and Group B) accept commands from the Read/Write Control Logic, receive control words from the internal data bus and issue the proper commands to its associated ports: Control Group A - Port A and Port C upper (C7-C4) Control Group B - Port B and Port C lower (C3-C0) The Control Word Register can only be written into. Therefore reading of the Control Word Register is not allowed . Ports A, B and C The MA28155 contains three 8-bit ports (A, B, and C). All can be configured in a wide variety of functional characteristics by the system software but each has its own special features to further enhance the power and flexibility of the MA28155. Port A. One 8-bit data output latch/buffer and one 8-bit data input latch. Port B. One 8-bit data input/output latch/buffer and one 8-bit input buffer Port C. One 8-bit data output latch/buffer and one 8-bit data input buffer (no latch for input) This port can be divided into two 4-bit ports under the mode control. Each 4-bit port contains a 4-bit latch and it can be used for the control signal outputs and status signal inputs in conjunction with ports A and B Figure 5: Basic Input (Read) Timing Diagram DSN CSN, A1, A0 RD/WN RD/WN set-up and hold time |
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