MC68307V Datasheet, PDF (9/34 Pages) Motorola, Inc – Technical Summary Integrated Multiple-Bus Processor

SYSTEM INTEGRATION MODULE
The MC68307 system integration module (SIM07) consists of several functions that control the system start-up,
initialization, configuration, and the external bus with a minimum of external devices.
The SIM07 features include:
• System configuration
• Oscillator & clock dividers
• Reset control, power-down mode control
• Chip-selects and wait states
• External bus interfaces, 68000 and 8051-compatible
• Parallel input/outputs with interrupt capability
• Interrupt configuration/response
• Software watchdog
• JTAG test access port
System Configuration
The MC68307 system configuration logic consists of a module base address register (MBAR) and a system
control register (SCR) which together allow the user to configure operation of the following functions:
• Base address and address space of internal peripheral registers
• Low-power (stand-by) modes
• Hardware watchdog for system protection
• 8051-compatible bus
• Peripheral chip selects
• Data bus size control for chip selected address ranges
Chip Select Logic and Dynamic Bus Sizing
The MC68307 provides four programmable chip-select signals (CS3–CS0). For a given chip-select block, the
user may choose whether the chip-select allows read-only, write-only, or both read and write accesses, whether
the chip-select should match only one function code value or all values, whether a DTACK is automatically
generated for this chip-select, and after how many wait states (from zero to six) the DTACK will be generated.
Each of the chip selects includes a dynamic bus-sizing extension to the basic 68000 bus which allows the system
designer to mix 16-bit and 8-bit contiguous address memory devices (RAM, ROM) on a 16-bit data bus system.
An additional feature of CS2 allows the user to opt either to use the programmable chip select CS2 or to use four
peripheral chip selects (CS2A, CS2B, CS2C, and CS2D). When the four peripheral chip selects are enabled,
each one selects a16-Kbyte block within the programmed range of CS2.
MOTOROLA
MC68307 TECHNICAL INFORMATION
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