XRT79L74 Datasheet, PDF (62/70 Pages) Exar Corporation – 4 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC

XRT79L74
REV. P1.0.0
PRELIMINARY
4 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC
FIGURE 15. TIMING DIAGRAM FOR THE TRANSMIT OVERHEAD DATA INPUT INTERFACE (METHOD 1 ACCESS)
t21
t22 t23
TxOHClk
TxOHFrame
TxOHIns
TxOH
X bit = 0
Remaining Overhead Bits with DS3 Frame
X bit = 0
t24 t25
FIGURE 16. TIMING DIAGRAM FOR THE TRANSMIT OVERHEAD DATA INPUT INTERFACE (METHOD 2 ACCESS)
TxInClk
t26 t27
TxOHFrame
TxOHEnable Pulse # 8
TxOHEnable
TxOHIns
TxOH
t29A
X bit = 0
t28 t29
XRT79L74 samples TxOH here.
X bit = 0
60