Motorola MPC823e Reference Manual page 540

Communication Processor Module
LAM—LCD/Video Aggressive Mode
The use of aggressive mode (as determined by the LAM, RAID and LAID fields) is not
recommended for use above waiting on response. If used above waiting on response
unexpected behavior will result. This behavior is caused by edge conflicts in the internal
logic for this mode of operation.
0 = Disable LCD aggressive mode. Priority depends on the LAID field.
1 = Enable LCD aggressive mode. The LAID and RAID fields must be equal to 00.
Note: This bit affects all DMA transfers, not just the LCD/video controller.
Bits 19–24 and 26–27—Reserved
These bits are reserved and must be set to 0.
LAID—LCD Controller Arbitration ID
This field determines the LCD and video controller arbitration ID. Its value must be
programmed to 00 for typical applications.
00 = The LCD controller uses U-Bus arbitration priority 6 (highest).
01 = The LCD controller uses U-Bus arbitration priority 5.
10 = The LCD controller uses U-Bus arbitration priority 2.
11 = The LCD controller uses U-Bus arbitration priority 1 (lowest).
RAID—RISC Controller Arbitration ID
This field establishes the priority level of bus arbitration among modules that can become
bus master. The instruction cache, data cache, system interface unit, and SDMAs all
compete for bus mastership. The SDMA channel arbitration ID is determined by the RAID
field. Arbitration IDs for all other bus masters are internally fixed. This value must be
programmed to 01 for typical applications.
00 = The SDMA uses U-Bus arbitration priority 6 (highest).
01 = The SDMA uses U-Bus arbitration priority 5.
10 = The SDMA uses U-Bus arbitration priority 2.
11 = The SDMA uses U-Bus arbitration priority 1 (lowest).
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