MM912F634CV2AP datasheet(65/335 Pages) FREESCALE

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Functional Description and Application Information

Die to Die Interface - Target

MM912F634

Freescale Semiconductor

4.5

Die to Die Interface - Target

The D2D Interface is the bus interface to the Microcontroller. Access to the MM912F634 analog die is controlled by the D2D

Interface module. This section describes the functionality of the die-to-die target block (D2D).

4.5.1

Overview

The D2D is the target for a data transfer from the target to the initiator (MCU). The initiator provides a set of configuration registers

and two memory mapped 256 Byte address windows. When writing to a window, a transaction is initiated sending a write

command, followed by an 8-bit address, and the data byte or word is received from the initiator. When reading from a window, a

transaction is received with the read command, followed by an 8-bit address. The target then responds with the data. The basic

idea is that a peripheral located on the MM912F634 analog die, can be addressed like an on-chip peripheral.

Features:

•

software transparent register access to peripherals on the MM912F634 analog die

•

256 Byte address window

•

supports blocking read or write, as well as non-blocking write transactions

•

4 bit physical bus width

•

automatic synchronization of the target when initiator starts driving the interface clock

•

generates transaction and error status as well as EOT acknowledge

•

providing single interrupt interface to D2D Initiator

4.5.2

Low Power Mode Operation

The D2D module is disabled in SLEEP mode. In Stop mode, the D2DINT signal is used to wake-up a powered down MCU. As

the MCU could wake up without the MM912F634 analog die, a special command will be recognized as a wake-up event during

Stop mode. See Section 4.3, “Modes of Operation".

4.5.2.1

Normal Mode / Stop Mode

NOTE

The maximum allowed clock speed of the interface is limited to fD2D.

While in Normal or Stop mode, D2DCLK acts as input only with pull present. D2D[3:0] operates as an input/output with pull-down

always present. D2DINT acts as output only.

4.5.2.2

Sleep Mode

While in Sleep mode, all Interface data pins are pulled down to DGND to reduce power consumption.

MM912F634CV2AP Datasheet(PDF) 65 Page - Freescale Semiconductor, Inc

MM912F634CV2AP Datasheet(HTML) 65 Page - Freescale Semiconductor, Inc

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