MEC1404 Datasheet, PDF (349/572 Pages) Microchip Technology – Keyboard and Embedded Controller Products for Notebook PC

MEC140X/1X
TABLE 24-1: TERMINOLOGY (CONTINUED)
Source
Term
Destination
Definition
The DMA Controller moves data from the Source to the Destination. The
Source provides the data. The Source may be either the Master or Slave
Controller.
The DMA Controller moves data from the Source to the Destination. The
Destination receives the data. The Destination may be either the Master
or Slave Controller.
24.5 Interface
This block is designed to be accessed externally via the pin interface and internally via a registered host interface.
FIGURE 24-1:
INTERNAL DMA CONTROLLER I/O DIAGRAM
Host Interface
DMA Interface
Power, Clocks and Reset
Interrupts
Internal DMA Controller
24.5.1 SIGNAL DESCRIPTION
This block doesn’t have any external signals that may be routed to the pin interface. This DMA Controller is intended to
be used internally to transfer large amounts of data without the embedded controller being actively involved in the trans-
fer.
24.5.2 HOST INTERFACE
The registers defined for the Internal DMA Controller are accessible by the various hosts as indicated in Section 24.10,
"DMA Main Registers".
24.5.3 DMA INTERFACE
Each DMA Master Device that may engage in a DMA transfer must have a compliant DMA interface. The following table
lists the DMA Devices in the MEC140X/1X.
TABLE 24-2: DMA CONTROLLER DEVICE SELECTION
Device Name
SMBus 0 Controller
Device Number
(Note 1)
0
1
Controller Source
Slave
Master
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DS00001956D-page 349