HD64570F Renesas Electronics America, HD64570F Datasheet - Page 49
HD64570F
Manufacturer Part Number
HD64570F
Description
IC SCA SRL COMM ADAPTER 88QFP
Manufacturer
Renesas Electronics America
Datasheet
1.HD64570F.pdf
(469 pages)
Specifications of HD64570F
Applications
ISDN
Interface
Serial
Voltage - Supply
4.5 V ~ 5.5 V
Package / Case
88-QFP
Mounting Type
Surface Mount
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
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1.7.10
In bit-synchronous mode, each DMAC channel in the SCA can perform chained-block transfer, in
which one or more data blocks are transferred in a continuous sequence (figure 1.21).
To set up a chained-block transfer:
1.
2.
3.
4.
On the DMA request from the MSCI, the DMAC will automatically fetch the first descriptor and
begin chained-block transfer.
address of a data buffer (data block), the data length, the starting address of the next descriptor,
and other information.
Create one or more descriptors in memory. A descriptor is a string of data giving the starting
Write the starting address of the first descriptor in a DMAC register.
Set necessary values in other DMAC registers.
Enable the corresponding DMA channel.
DMA Buffer Chaining
DMAC registers
address of first
Data
length n
descriptor
* Chain pointer base (CPB) + current descriptor address register (CDA)
Starting
SCA
0
First data buffer
next descriptor
Data length n
First descriptor
*
data buffer
address of
address of
Starting
Starting
Figure 1.21 DMA Buffer Chaining
0
n
1
Second data buffer
Second descriptor
Address space
n
1
n
2
Third data buffer
Third descriptor
n
2
n
Rev. 0, 07/98, page 33 of 453
3
Fourth data buffer
Fourth descriptor
n
3
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