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Tech Note |
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AN96098: Interfacing 68000 Family Peripherals To The XA |
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The XA is not limited to interface to 80XX compatible peripherals. By using some glue logic, or a PLD if available, the XA can be interfaced to a 68000 compatible peripheral. Using the 68000 DTACKn signal enables the use of slow 68000 peripherals without the need of an external WAIT state generator.
Many peripherals with a 68000 compatible interface are on the market. This document shows that these 68000 peripherals can be interfaced to the XA very easily. This means that an XA user is not limited to an XA compatible peripheral in his XA design. Several interfacing aspects are covered: normal interfacing, interrupt interfacing and bus arbitration. This document assumes that users are familiar with the XA and its bus interface.
The Philips Semiconductors XA is a 16 bit high speed microcontroller with an 80XX compatible bus (found on e.g. an 8051 or 8048 with separate read and write strobes). This means that popular periherals with an 80XX compatible bus can be used with the XA. This documents shows that besides 80XX peripherals also peripherals with a 68000 bus can be used. Extra advantage is that the 68000’s DTACKn output is extremely suitable to generate an XA WAIT strobe. The main advantage of using this DTACKn output is that a full handshake is available (synchronous) and consequently NO external wait state generator is needed.
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