SA1110 Datasheet, PDF(223/406 Page) Intel Corporation – Intel StrongARM SA-1110 Microprocessor

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SA1110 Datasheet, PDF (223/406 Pages) Intel Corporation – Intel StrongARM SA-1110 Microprocessor

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Peripheral Control Module

11.7.9 DMA Channel 1 Current Address Register

DMA channel 1 current address register (DCAR1) is a 32-bit read-only register that is used by

DMA channel 1 to keep track of the address of the DMA transfer currently in progress or the

address of the next DMA transfer. Any time the LCD is first enabled (LEN= 0 â 1) or the value in

the current address pointer register equals the calculated end address value, the contents of the base

address pointer register is transferred to the current address pointer. This register can be read to

determine the approximate line that the LCD controller is currently processing and driving out to

the display. It is also useful to read this register just before writing the DMAâs base address pointer

to ensure that the end of frame is not about to occur, which means that the base address pointer is

about to be transferred to the current address pointer. Note that DCAR1 is a read-only register that

is not reset and is not initialized until the LCD is first enabled, causing the contents of the base

address register to be transferred to it; question marks indicate that the values are unknown at reset.

Note: A question mark (?) signifies that the Reset value of that bit is undefined when the processor has

completed its reset cycle.

0h B010 0014

DCAR1: DMA Channel 1 Current

Address Register

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

DMA Channel 1 Current Address Pointer

Reset ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?

Bits

31..0

Name

DCAR1

Description

DMA channel 1 current address pointer.

Read-only register. Continuously reflects the current address that DMA channel 1 is

transferring from or will use in the next transfer. Base address register is transferred to this

register whenever the LCD is enabled (LEN= 0 â 1) and when the current address is equal

to the calculated end address of the buffer.

SA-1110 Developerâs Manual

11-43

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