Samsung S5PC100 User Manual page 424

S5PC100 USER'S MANUAL (REV1.0)
4.2.24
Quality of Service Configuration Register n (QosConfig n, R/W, Address=0xE600_0064 + 8n (n=0~7, integer)
QOSCONFIGn
qos_mask [31:16]
qos_id [15:0]
Bit
QoS Mask Bits
This is used to mask the incoming ARID to compare with the
qos_id.
For example, to have 0b00110XX000 IDs the same QoS, the
4th and 5th bits must be masked. Therefore, qos_mask would
be 0b1111100111.
QoS ID
This is used to compare with the masked ARID to check
whether its timeout counter should be used for QoS.
After applying the qos_mask to these ARID, it is compared
with qos_id. The qos_id must be 0b001100_0000 using the
example above. Comparing the masked ID, if the result is
equal to the qos_id, then the QoSControl0.qos_cnt is
applied to this ARID transaction for timeout.
Don't care bits must be assigned zeros.
Description
DRAM CONTROLLER
Reset
R/W
Value
R/W 0x0
R/W 0x0
5.1-41