Achronix Speedster22i Clock and Reset Networks - Manual (Page 22)

22 UG027, May 21, 2014

Global Clock Mux (GCM)

Quadrant Clock Mux (QCM)

Region Clock Mux (RCM)

Byte-Lane Clock Mux (BCM)
The global boundary clock network traverses through each of these mux stages, whereas the
local boundary clock uses a shortened path that ties the output of the GCM directly into the
BCM. The full boundary clock network architecture is shown in detail in Figure 13 below,
with red paths highlighting the GCM to QCM connectivity, the blue paths highlighting the
QCM to RCM connectivity and the dark yellow paths highlighting the RCM to BCM paths.
The local boundary clock network is shown in green.
GCMSW
Fabric Core
GCMNW
GCMNE
1
6
c
lo
c
k n
e
tw
o
rk
s
R
C
M
W
S
R
C
M
W
N
B
C
M
W
S
B
C
M
W
N
1 6
c
lo
c
k
n
e tw
o
rk
s
GCMSE
QCMWS
QCMSW
ZGMSW_IQ_CLK[15:0]
Z
G
M
S
W
_
IQ
_
C
L
K
[1
5
:0
]
ZGMSE_IQ_CLK[15:0]
Z
G
M
N
W
_
IQ
_
C
L
K
[1
5
:0
]
Z
G
M
S
E
_
IQ
_
C
L
K
[1
5
:0
]
Z
G
M
N
E
_
IQ
_
C
L
K
[1
5
:0
]
Z
Q
M
W
S
_
IR
_
C
L
K
[1
5 :0
]
ZQMSW_IR_CLK[15:0]
QCMWN
QCMNW
Z
Q
M
W
N
_ IR
_
C
L
K
[1
5
:0
]
ZQMNW_IR_CLK[15:0]
ZGMSW_IB_CLK[15:0]
ZGMNW_IB_CLK[15:0]
Z R M
W
N _ IB
_ C L K [1
5 :0
]
Z R M
W
S _ IB
_ C L K [1
5 :0
]
ZGMNW_IQ_CLK[15:0]
ZGMNE_IQ_CLK[15:0]
QCMES
QCMSE
Z
Q
M
E
S
_
IR
_
C
L K
[1
5
:0
]
ZQMSE_IR_CLK[15:0]
QCMEN
QCMNE ZQMNE_IR_CLK[15:0]
R
C
M
E
S
R
C
M
E
N
Z
Q
M
E
N
_ IR
_
C
L
K
[1
5
:0
]
B
C
M
E
N
ZGMNE_IB_CLK[15:0]
Z R M
E N _ IB
_ C L K [1
5 :0
]
B
C
M
E
S
Z R
M
E S _ IB
_ C L K
[1
5 :0
]
ZGMSE_IB_CLK[15:0]
RCMNW
BCMNW
ZRMNW_IB_CLK[15:0]
RCMSW
BCMSW
ZRMSW_IB_CLK[15:0]
1
6
c
lo
c
k n
e
tw
o
rk
s
1 6
c
lo
c
k
n
e tw
o
rk
s
BCMSE
RCMSE
ZRMSE_IB_CLK[15:0]
RCMNE
BCMNE
ZRMNE_IB_CLK[15:0]
R
C
M
W
C
1
6 c
lo
c
k
n
e
tw
o
rk
s
Z R
M W
C _ IB
_ C L K [1
5 :0
]
1
6
c
lo
c
k
n
e
tw
o
rk
s
R
C
M
E
C
B
C
M
E
C
Z R M
E C
_ IB
_ C L K [1
5 :0
]
B
C
M
W
C
Clock Mux
Clock Mux
Figure 13: Full Boundary Clock Network Architecture
Note that usage of the local boundary clock is more restrictive in that the South BCMs can
only be fed by the South GCMs/CGs. The North and Center BCMs can only be fed by the
North GCMs/CGs. The output of the BCMs can additionally be used to enter the core clock
network, though this is generally not recommended.