SA1110 Datasheet, PDF (192/406 Pages) Intel Corporation – Intel StrongARM SA-1110 Microprocessor

Peripheral Control Module
11.6.1.4
DMA Buffer A Transfer Count Register (DBTAn)
The DBTAn is a 32-bit read/write register that contains the current transfer count in bytes for buffer
A. This register may be written only when the STRTA bit for this channel is a zero. The following
figure shows the format of this register; question marks indicate that the values are unknown at reset.
DBTAn
Read/Write
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Reserved
Reset 0 0 0 0 0 0 0 0 0 0 0 0 0 0 ?0 0 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?
Bits
12..0
31..13
Name
TCA 12..0
—
Description
Transfer count (buffer A).
This field is a 13-bit value and contains the current transfer count (in bytes) for the transfer to or
from buffer A. The maximum value programmed via this transfer count is 8 Kbyte.
Reserved. These bits are reserved and read as zeros. Writes to this field have no effect.
11.6.1.5
DMA Buffer B Start Address Register (DBSBn)
The DBSBn is a 32-bit read/write register that contains the starting memory address for buffer B.
This register may be written only while STRTB in the DCSR is zero.
11.6.1.6
DMA Buffer B Transfer Count Register (DBTBn)
The DBTBn is a 32-bit read/write register that contains the current transfer count in bytes for buffer
B. This register may be written only when the STRTB bit for this channel is a zero. The following
figure shows the format of this register; question marks indicate that the values are unknown at reset.
DBTBn
Read/Write
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Reserved
Reset 0 0 0 0 0 0 0 0 0 0 0 0 0 0 ?0 0 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?
Bits
12..0
31..13
Name
TCB 12..0
—
Description
Transfer count (buffer B).
This field is a 13-bit value and contains the current transfer count (in bytes) for the transfer to or
from buffer B. The maximum value programmed via this transfer count is 8 Kbyte.
Reserved.
These bits are reserved and read as zeros. Writes to this field have no effect.
11-12
SA-1110 Developer’s Manual