XRT79L74 Datasheet, PDF (63/70 Pages) Exar Corporation – 4 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC

PRELIMINARY
4 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC
RECEIVE PAYLOAD DATA OUTPUT INTERFACE
RECEIVE PAYLOAD DATA OUTPUT INTERFACE - TIMING REQUIREMENTS
XRT79L74
REV. P1.0.0
TABLE 11: TIMING INFORMATION FOR THE RECEIVE PAYLOAD DATA OUTPUT INTERFACE BLOCK
Test Conditions: TA = 25°C, VDD = 3.3V + 5% unless otherwise specified
SYMBOL
PARAMETER
MIN. TYP. MAX. UNITS
Receive Payload Data Output Interface Timing - Serial Mode Operation (See Figure 17)
t₅₀ Rising edge of RxClk to Payload Data (RxSer) out-
put delay
13
ns
16
ns
CONDITIONS
DS3 Applications
E3 Applications
t₅₁ Rising edge of RxClk to RxFrame output delay
13
ns DS3 Applications
16
ns E3 Applications
t₅₂ Rising edge of RxClk to RxOHInd output delay.
13
ns DS3 Applications
16
ns
Receive Payload Data Output Interface Timing - Nibble Mode Operation (see Figure 18)
t₅₃
Falling edge of RxClk to rising edge of RxFrame out-
put delay
2.1
ns
t₅₄
Falling edge of RxClk to rising edge of RxNib[3:0]
output delay
2
ns
E3 Applications
FIGURE 17. TIMING DIAGRAM FOR THE RECEIVE PAYLOAD DATA OUTPUT INTERFACE (SERIAL MODE)
XRT79L74 Receive Payload Data I/F Signals
t50
RxClk
RxSer
RxFrame
RxOHInd
Payload[4702] Payload[4703]
t51
X-Bit
t52
Payload[0]
61