MC68340 datasheet(282/441 Pages) FREESCALE

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6- 32

MC68340 USER’S MANUAL

MOTOROLA

6.7.5 Function Code Register (FCR)

The FCR contains the source and destination function codes for the channel. This register

is accessible in either supervisor or user space. The FCR can always be read or written to

when the DMA module is enabled (i.e., the STP bit in the MCR is cleared).

FCR1, FCR2

$78B, $7AB

76543210

SFC

DFC

RESET:

UUUUUUUU

U = Unaffected by reset.

Supervisor/User

SFC—Source Function Code Field

This field can be used to specify the source access to a certain address space type.

The source function code bits are defined in Table 6-6.

DFC—Destination Function Code Field

This field can be used to specify the destination access to a certain address space type.

The destination function code bits are defined in Table 6-6.

Table 6-6. Address Space Encoding

Function Code Bits

Address Spaces

Reserved (Motorola)

User Data Space

User Program Space

Reserved (User)

Reserved (Motorola)

Supervisor Data Space

Supervisor Program

Space

CPU Space

DMA Space

NOTE

Although FC3 can be set for DMA transfers to distinguish the

source or destination space from other data or program

spaces, it is not required to be set. Since the CPU32 currently

has only 3-bit SFC and DFC capability, it cannot emulate

FC3 = 1 at this time. However, it is recommended that FC3 be

set to one to distinguish DMA or CPU access during debug.

Freescale Semiconductor, Inc.

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