CN8223
4.0 Electrical and Mechanical Specifications
ATM Transmitter/Receiver with UTOPIA Interface
4.3 Timing
Figure 4-4. Parallel Interface Timing
1
4
5
7
8
TXCKI
6
9
TXOD
2
3
TXDAT[7:0]
TXDELO
RXCKI
11
13
15
12
16
RXOD
10
14
RXDAT[7:0]
Table 4-6. Overhead Port Interface Timing
Name
Interval
—
Description
Transmit or Receive Clock Input Period
Transmit Overhead Clock Pulse Width High
Min
Max
—
—
—
—
—
—
—
—
—
—
—
—
—
t
t
6.4
ptx, prx
t
2–4
4 × t
tckh
ptx
t
1–2
Transmit Marker Valid before Transmit Clock High
Transmit Overhead Data Setup before Clock Falling Edge
Transmit Overhead Data Hold after Clock Falling Edge
Receive Overhead Clock1 Pulse Width High
3 × t
tmtck
ptx
t
t
3–4
6.0
6.0
4 × t
dtck
tckd
4–5
t
8–9
rck1h
prx
prx
prx
prx
prx
prx
prx
t
t
6–8
Marker1 Valid before Clock1 Rising Edge
3 × t
3 × t
2 × t
4 × t
3 × t
3 × t
m1rck1
t
t
t
7–8
Receive Overhead Data Valid before Clock1 Rising Edge
Receive Overhead Data Valid after Clock1 Rising Edge
Receive Overhead Clock0 Pulse Width High
drck1
rck1d
rck0h
8–10
13–14
12–13
11–13
13–15
Marker0 Valid before Clock0 Rising Edge
m0rck0
t
t
Receive Overhead Data Valid before Clock0 Rising Edge
Receive Overhead Data Valid after Clock0 Rising Edge
drck0
rck0d
2.4
100046C
Conexant
4-9
CONEXANT [ CONEXANT SYSTEMS, INC ]
