MEDIATEK Ralink MT7620 - Block Diagram; Features; RBUS Matrix and Qos Arbiter

PGMT7620_V.1.0_040503
Page 178 of 523
MT7620 PROGRAMMING GUIDE
Integrated 802.11n MAC/BBP and 2.4 GHz RF/FEM Router-on-a-Chip
2.16 RBUS Matrix and QoS Arbiter
2.16.1 Features
 8 channel QoS Arbiter
 Configurable Bandwidth and Duedate for each agent
 QoS classifier can be programmed for RR, BW RR, Fixed Priority and QoS Arb
2.16.2 Block Diagram
LCgd
arbiter
Req#0 Req#1 Req#2 Req#7
TRTC TRTC TRTC TRTC
8 to 1 Strict priority arbiter
(based on service priority)
...
LSg
arbiter
BEy
arbiter
LCg
arbiter
N requestors (N=8)
M first
stage arbiters
(N ports/arbiter)
1 second
stage arbiter
(M ports)
N Meters
N Classifiers
N-port QoS Arbiter
M(=8) run time
QoS types
Classifier Classifier Classifier Classifier
N Run time classifiers
(based on QoS type,
due date and color)
Figure 2-17 QoS Arbitration Block Diagram