MPC8544COMEDEV Freescale Semiconductor, MPC8544COMEDEV Datasheet - Page 952

• Manufacturer Part Number: MPC8544COMEDEV
• Description: KIT DEV EXPRESS MPC8544COM
• Manufacturer: Freescale Semiconductor
• Type: MPUr

Specifications of MPC8544COMEDEV

• Contents: Board
• For Use With/related Products: MPC8544
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

DMA Controller
16.3.1.1
The mode register allows software to start a DMA transfer and to control various DMA transfer
characteristics.
Table 16-5
16-10
Offset 0x100
Reset
Reset
11–12
Bits
0–3
4–7
8–9
10
13
W
W
R
R
0x180
0x200
0x280
SAHTS DAHE SAHE
16
0
EMP_EN External master pause enable. Valid only if MR n [EMS_EN] is set.
EMS_EN External master start enable. This bit does not apply to single-write start modes (direct or chaining).
Name
BWC
17
—
—
—
describes the MRn fields.
MPC8544E PowerQUICC III Integrated Host Processor Family Reference Manual, Rev. 1
Mode Registers (MR n )
—
18
Figure 16-4
Reserved
Bandwidth/pause control.
If multiple channels are executing transfers concurrently the value of MR n [BWC] determines how many
bytes a given channel is allowed to transfer before the DMA engine pauses the current channel and switches
to the next channel.
If only one channel is executing transfers the value of MR n [BWC] dictates how many bytes are allowed to
transfer before pausing the channel, after which a new assertion of DREQ resumes channel operation.
0000 1 byte
0001 2 bytes
0010 4 bytes
0011 8 bytes
0100 16 bytes
0101 32 bytes
0110 64 bytes
Reserved
0 Disable the external master pause feature.
1 Enable the external master pause feature. Channel is paused as described by MR n [BWC].
Reserved
0 Disable the channel from being started by an external DMA start pin.
1 Enable the channel to be started by an external DMA start pin, which sets MR n [CS].
19
3
—
20
4
describes the MRn.
SRW EOSIE EOLNIE EOLSIE EIE
21
Figure 16-4. DMA Mode Registers (MR n )
BWC
Table 16-5. MR n Field Descriptions
22
23
7
All zeros
All zeros
24
8
—
Description
25
9
0111 128 bytes
1000 256 bytes
1001 512 bytes
1010 1024 bytes
1011–1110 Reserved
1111 Disable bandwidth sharing to allow
EMP_EN
XFE
10
26
uninterrupted transfers from each channel.
CDSM/SWSM
11
27
—
Freescale Semiconductor
CA
12
28
Access: Read/Write
EMS_EN DAHTS
CTM
13
29
CC CS
14
30
15
31