MPC823 datasheet(46/74 Pages) MOTOROLA

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Communication Processor Module

16-424

MPC823 REFERENCE MANUAL

MOTOROLA

16.11.8.2 SMCx GCI PARAMETER RAM MEMORY MAP. The SMCx GCI parameter

RAM area begins at the same offset from each SMCx base area. The SMCx in GCI mode

has a very different parameter RAM memory map than the SMCx in UART or transparent

mode. In GCI mode, the general-purpose parameter RAM contains the buffer descriptors,

instead of pointers, to the buffer descriptors. You can see the difference when you compare

Table 16-38 with Table 16-36. The SMCx in GCI mode contains no protocol-specific

parameter RAM.

• M_RXBD—The SMCx monitor channel receive buffer descriptor is used by the

communication processor module to report information about the monitor channel

receive byte.

E—Empty

When a serial management controller uses the monitor channel protocol, it waits until

the core sets this bit before acknowledging the monitor channel data.

0 =

The communication processor module clears this bit to indicate that the data

byte associated with this buffer descriptor is now available to the core.

1 =

The core sets this bit to indicate that the data byte associated with this buffer

descriptor has been read.

Table 16-38. SMCx GCI Parameter RAM Memory Map

ADDRESS

NAME

WIDTH

DESCRIPTION

SMCx Base + 00

M_RXBD

Half-word

Monitor Channel RX Buffer Descriptor

SMCx Base + 02

M_TXBD

Half-word

Monitor Channel TX Buffer Descriptor

SMCx Base + 04

CI_RXBD

Half-word

Circuit Interface Channel

RX Buffer Descriptor

SMCx Base + 06

CI_TXBD

Half-word

Circuit Interface Channel

TX Buffer Descriptor

SMCx Base + 08

Temp1

Half-word

SMCBase + 0A

Temp2

Half-word

SMCx Base + 0C

Temp3

Half-word

SMCx Base + 0E

Temp4

Half-word

NOTE:

You are only responsible for initializing the items in bold.

SMCx Base = (IMMR & 0xFFFF0000) + 0x3E80 (SMC1) and 0x3F80 (SMC2).

OFFSET + 0

RESERVED

DATA

NOTE: You are only responsible for initializing the items in bold.

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