MPC8540 datasheet(997/1302 Pages) FREESCALE

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Memory Map/Register Definition

MPC8540 PowerQUICC III Integrated Host Processor Reference Manual, Rev. 1

Freescale Semiconductor

17-73

Figure 17-70. Inbound Mode Register (IMR)

Table 17-72 describes the fields of the IMR.

1516

1920

29 30

R 0 00000000 0 0

SEN

FRM_SIZ

CIRQ_SIZ

000

QFIE

MIQIE EIE

000

MI ME

Reset

0000_0000_0000_0000_0000_0000_0000_0000

Offset

0xD_1060

Table 17-72. IMR Field Descriptions

Bits

Name

Description

0–10

—

Reserved

SEN

Snoop enable

0 Snooping of the processor core while writing messages into memory disabled

1 Snooping of the processor core while writing messages into memory enabled

12–15

FRM_SIZ Message frame size. Determines the maximum message size that can be accepted by this

mailbox without error. This parameter combined with CIRQ_SIZ determine the maximum

contiguous memory space allocated to the mailbox.

0000–0001 Reserved

0010 8 bytes

0011 16 bytes

0100 32 bytes

0101 64 bytes

0110 128 bytes

0111 256 bytes

1000 512 bytes

1001 1024 bytes

1010 2048 bytes

1011 4096 bytes

1100–1111 Reserved

16–19

CIRQ_SIZ Circular frame queue size. Determines the number of message frames that can be placed in the

circular queue without overflow. This parameter combined with FRM_SIZ determines the

maximum contiguous memory space allocated to the mailbox.

0000 2

0001 4

0010 8

0011 16

0100 32

0101 64

0110 128 (4 Kbyte page boundary)

0111 256

1000 512

1001 1024

1010 2048

1011–1111 Reserved

20–22

—

Reserved

QFIE

Queue full interrupt enable

0 No QFI interrupt is generated

1 Generates an interrupt when the queue is full (that is, the enqueue and dequeue pointers are

equal after the dequeue pointer was incremented by the mailbox controller)

—

Reserved

MIQIE

Message in queue interrupt enable

0 No MIQ interrupt is generated

1 Generates an interrupt when the queue transitions to not empty (that is, the enqueue and

dequeue pointers are no longer equal after an increment by the mailbox controller)

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