Preliminary
S3C2451X RISC MICROPROCESSOR
BUS PRIORITIES
4-1
Preliminary product information describe products that are in development,
for which full characterization data and associated errata are not yet available.
Specifications and information herein are subject to change without notice.
4
BUS PRIORITIES
OVERVIEW
The bus arbitration logic determines the priorities of bus masters. It supports a combination of rotation priority
mode and fixed priority mode.
BUS PRIORITY MAP
The S3C2451 holds 16 masters on the AHB_S(System Bus), 9 masters on the AHB_I(Image Bus) and 9masters
on the APB Bus. The following list shows the priorities among these bus masters after a reset.
Priority
AHB_S BUS MASTERS
Comment
0 CF
1 HS-MMC1
2 DMA0
3 DMA1
4 DMA2
5 DMA3
6 DMA4
7 DMA5
8 DMA6
9 DMA7
10 UHOST
11 UDEVICE20
12 HS-MMC0
10 Reserved
11 Reserved
13 ARM926EJ
DBUS
14 ARM926EJ
IBUS
15 Default
1. Fix Type: all priority can be changed according to register value
stored in The System Controller.
2 Rotation Type: all masters’ priority can be rotatable according to
register value stored in The System Controller.
(Except for Default Masters)