Communication Processor Module
16-388
MPC823e REFERENCE MANUAL
MOTOROLA
SMC
COMMUNICATION
16
PROCESSOR MODULE
01 = PowerPC little-endian byte ordering. As data is transmitted onto the serial line
from the data buffer, the least-significant byte of the buffer double-word
contains data to be transmitted earlier than the most-significant byte of the
same buffer double-word.
1X = Motorola byte ordering (normal operation) is also called big-endian byte
ordering. As data is transmitted onto the serial line from the data buffer, the
most-significant byte of the buffer word contains data to be transmitted earlier
than the least-significant byte of the same buffer word.
AT—Address Type 1–3
These bits contain the function code value used during the SDMA channel memory
access. The AT0 pin is driven with a 1 to identify this SDMA channel access as a DMA
type.
Bits 0–2—Reserved
These bits are reserved and must be set to 0.
BO—Byte Ordering
Set these bits to select the required byte ordering of the data buffer. If this field is
modified on-the-fly, it takes effect at the beginning of the next frame or the next buffer
descriptor.
00 = The DEC/Intel convention is used for byte ordering (swapped operation) and
is also called little-endian byte ordering. The transmission order of bytes within
a buffer word is reversed in comparison to the Motorola mode. This mode is
supported only for 32-bit port size memory.
01 = PowerPC little-endian byte ordering. As data is transmitted onto the serial line
from the data buffer, the least-significant byte of the buffer double-word
contains data to be transmitted earlier than the most-significant byte of the
same buffer double-word.
1X = Motorola byte ordering (normal operation) is also called big-endian byte
ordering. As data is transmitted onto the serial line from the data buffer, the
most-significant byte of the buffer word contains data to be transmitted earlier
than the least-significant byte of the same buffer word.
TFCR
BIT
0 1 2 3 4 5 6 7
FIELD
RESERVED BO AT1–AT3
RESET
000
R/W
R/W R/W R/W
ADDR
SMC1 AND SMC2 BASE + 0x05
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