XRT79L72 Datasheet, PDF (60/72 Pages) Exar Corporation – 2 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC

XRT79L72
REV. P1.0.2
PRELIMINARY
xr
2 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC
FIGURE 12. TIMING DIAGRAM FOR THE TRANSMIT PAYLOAD DATA INPUT INTERFACE WHEN THE XRT79L72 IS
OPERATING IN BOTH THE DS3 AND LOCAL-TIMING MODES
XRT79L72 Transmit Payload Data I/F Signals
t6
t5
TxInClkn
t8
t7
TxSern
TxFrameRefn
Payload[4702] ^{Payload[4703]}
X-Bit
Payload[1]
TxOH_Indn
t9
t10
DS3 Frame Number N ^{DS3 Frame Number N + 1}
FIGURE 13. TIMING DIAGRAM FOR THE TRANSMIT PAYLOAD DATA INPUT INTERFACE WHEN THE XRT79L72 IS
OPERATING IN BOTH THE DS3/NIBBLE-PARALLEL AND LOOP-TIMING MODES
t13A
RxOutClkn
TxNibClkn
TxNibn[3:0]
TxNibFramen
t13
t11
t12
Nibble [1175]
Sampling Edge of XRT79L72
Nibble [0]
57