Freescale Semiconductor MPC5553, Reference Manual

Page: 345 / 1208

MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
9-26 Freescale Semiconductor
37–39 /
0x4 [5:7]
SSIZE
[0:2]
Source data transfer size.
000 8-bit
001 16-bit
010 32-bit
011 64-bit
100 Reserved
101 32-byte burst (64-bit x 4)
110 Reserved
111 Reserved
The attempted specification of a ‘reserved’ encoding will cause a configuration
error.
40–44 /
0x4 [8:12]
DMOD
[0:4]
Destination address modulo. See the SMOD[0:5] definition.
45–47 /
0x4 [13:15]
DSIZE
[0:2]
Destination data transfer size. See the SSIZE[0:2] definition.
48–63 /
0x4 [16:31]
SOFF
[0:15]
Source address signed offset. Sign-extended offset applied to the current source
address to form the next-state value as each source read is completed.
64–95 /
0x8 [0:31]
NBYTES
[0:31]
Inner “minor” byte transfer count. Number of bytes to be transferred in each service
request of the channel. As a channel is activated, the contents of the appropriate
TCD is loaded into the eDMA engine, and the appropriate reads and writes
performed until the complete byte transfer count has been transferred. This is an
indivisible operation and cannot be stalled or halted. After the minor count is
exhausted, the current values of the SADDR and DADDR are written back into the
local memory, the major iteration count is decremented and restored to the local
memory. If the major iteration count is completed, additional processing is
performed.
Note: The NBYTES value of 0x0000_0000 is interpreted as 0x1_0000_0000, thus
specifying a 4 GByte transfer.
96–127 /
0xC [0:31]
SLAST
[0:31]
Last source address adjustment. Adjustment value added to the source address at
the completion of the outer major iteration count. This value can be applied to
“restore” the source address to the initial value, or adjust the address to reference
the next data structure.
128–159 /
0x10 [0:31]
DADDR
[0:31]
Destination address. Memory address pointing to the destination data.
160 /
0x14 [0]
CITER.E_LINK Enable channel-to-channel linking on minor loop completion. As the channel
completes the inner minor loop, this flag enables the linking to another channel,
defined by CITER.LINKCH[0:5]. The link target channel initiates a channel service
request via an internal mechanism that sets the TCD.START bit of the specified
channel. If channel linking is disabled, the CITER value is extended to 15 bits in
place of a link channel number. If the major loop is exhausted, this link mechanism
is suppressed in favor of the MAJOR.E_LINK channel linking.
0 The channel-to-channel linking is disabled.
1 The channel-to-channel linking is enabled.
Note: This bit must be equal to the BITER.E_LINK bit otherwise a configuration
error will be reported.
Table 9-18. TCDn Field Descriptions (Continued)
Bits /
Word Offset [n:n]
Name Description