DATA
DATA
DATA
S
DATA
VALID
STALL
RESYNC
R
VALID
VALID
STALL
STALL
VALID
STALL
CK
CKD
DATA
D0
D1
D2
D3
D4
V3
V2
V1
V0
VALID
S
FLIT
FLIT
FLIT
REQ
REQ
REQ
ACK
ACK
ACK
R
45
Interconnection Networks in Network-on-Chip
Figure 2.25
T-Error protocol implementation.
Figure 2.26
ACK/NACK protocol implementation.
This flow control technique is used in XPIPES (Bertozzi and Benini 2004;
Bertozzi et  al. 2005).
2.6 Quality-of-Service Support
Quality of service (QoS) is an important aspect of NoC architecture where
instead of maximizing the average performance of a network, attention is given
to a fair allocation policy such that each application gets sufficient resources
to meet its throughput, latency, and bandwidth requirements. NoC traffic falls
into two broad categories: guaranteed throughput (GT) and best effort (BE).