XRT79L71_07 Datasheet, PDF (96/109 Pages) Exar Corporation – 1-CHANNEL DS3/E3 ATM UNI/PPP/CLEAR-CHANNEL FRAMER IC - HARDWARE

XRT79L71
1-CHANNEL DS3/E3 ATM UNI/PPP/CLEAR-CHANNEL FRAMER IC - HARDWARE
REV. 1.0.0
TABLE 16: TIMING INFORMATION FO RTHE TRNASMIT PAYLOAD DATA INPUT INTERFACE BLOCK
Test Conditions: TA = 25°C, VDD = 3.3V + 5% unless otherwise specified
SYMBOL
PARAMETER
MIN. TYP.
MAX. UNITS
CONDITIONS
t₁₄ TxNib set-up time to third rising edge of TxInClk
20
ns DS3 Applications
27
ns E3 Applications
t₁₅ Payload Nibble hold time, from latching edge of
0
ns
TxInClk
t₁₆ TxFrameRef set-up time, to latching edge of TxInClk
20
ns DS3 Applications
27
ns E3 Applications
t₁₇ TxFrameRef hold time, from latching edge of TxNib- 0
Clk
t₁₈ TxNibClk to TxNibFrame output delay time
20
Framer IC is
Frame Slave
ns
Framer IC is
Frame Slave
25
ns DS3 Applications
31
ns E3 Applications
FIGURE 17. TIMING DIAGRAM FOR THE TRANSMIT PAYLOAD DATA INPUT INTERFACE WHEN THE XRT79L71 IS
OPERATING IN BOTH THE DS3 AND LOOP-TIMING MODES
XRT79L71 Transmit Payload Data I/F Signals
t3
RxOutClk
TxSer
TxFrame
TxOH_Ind
Payload[4702] Payload[4703]
X-Bit
t2
t1
Payload[0]
t4
DS3 Frame Number N
DS3 Frame Number N + 1
93