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Receive v.54 state machine figure 5.4b – Rainbow Electronics DS3134 User Manual

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DS3134

69 of 203

Receive V.54 State Machine Figure 5.4B

VRST = 1

VLB = 0
VTO = 0
SLBP = 0

Search for
Loop Up
Pattern for
32 VCLKs

Reset 4 second timer;
wait for Loss of Sync or
All 1s (64 in a Row)
or for the 4 second
timer to expire

Search for
Loop Down
Pattern
VLB = 1

Sync = 0

VLB = 0

Sync = 1

VTO = 1

Sync = 0

Sync = 0 or
4 Second Timer
Has Expired

Sync = 1

All Ones

Time Out (VTO)
Loopback (VLB);
both in RP[n]CR

V.54 State
Machine

CLK

Data

VRST (in RP[n]CR)

v54sm

All Ones

SYSCLK

Sysclk is used only to time
a 4 second timer. It is run into
a 2E27 counter which provides
a 4.03 second time out with a
33MHz clock and a 5.37 second
time out with a 25MHz clock

wait for Loss of Sync or
All 1s (64 in a Row)

Sync = 0

Change of
State in Status
(SLBP); in SV54

SLBP = 1

SLBP = 1

See also other documents in the category Rainbow Electronics Communication: