Rainbow Electronics TS81102G0 - Manual (Page 19)

19
TS81102G0
2105C–BDC–11/03
Timing Diagrams with
Synchronous Reset Following is an example of the Synchronous Reset’s utility in case of de-synchronization of the
DMUX output port selection. The de-synchronization event happens after the selection of Port
D.
DMUXDelAdjCtrl value is nominal. TSSR < 0 because of Clkln’s internal propagation delay
TCPD. After selection of Port C, instead of selecting Port D, the de-synchronization makes the
port selection to restart on Port A. Since Port H was not selected, the data is not output to the
ports but the last data (d1 to d8) is latched until the next selection of Port H. d9 to d16 are lost.
The synchronous Reset ensures a re-synchronization of the port selection.
Figure 16. Synchronous Reset, 1:8 Ratio, DR Mode
Example of the Synchronous Reset’s utility in case of de-synchronization of the DMUX output
port selection. The de-synchronization event happens after the selection of Port D.
DMUXDelAdjCtrl value is nominal. TSSR < 0 because of Clkln’s internal propagation delay
TCPD. After selection of Port C, instead of selecting Port D, the de-synchronization makes the
port selection to restart on Port A. Since Port H was not selected, the data is not output to the
ports but the last data (d1 to d4) is latched until the next selection of Port H. d5 to d8 are lost.
The synchronous Reset ensures a re-synchronization of the port selection.
THSR
TSSR
Clkn
SyncReset
Internal Port Selection
(not available out of the DEMUX)
A B C D
d1 d0 d2 d3 d4 d5 d6 d7 d8 d9 d10 d11
d17 d1
d18
d19 d3
d21 d5
d23 d7
d24 d8
d20 d4
d22 d6
d2
d12 d13 d14 d15 d16 d17 d18 d19 d20 d21 d22 d23 d24 d25 d26 d27
E D E F G H B A C B A C D E F G H B A C D B A C
THSR
TCPD
TOD
TSSR
THSR
TSSR
Period of uncertainty due to desynchronization
TCPD
TOD
TSRDR TDRR TDRF TDRR TDRF
I[0..9]
A[0..9]
B[0..9]
C[0..9]
D[0..9]
E[0..9]
F[0..9]
G[0..9]
H[0..9]
DR